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Substitution of Tailings Sand in Cement-Stabilized Gravel Base Material for Road Construction: Mechanical Properties, Durability, and Microstructure SCIE
期刊论文 | 2025 , 37 (4) | JOURNAL OF MATERIALS IN CIVIL ENGINEERING
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Abstract :

The aim of this research is to explore the feasibility of using tailings sand (TS) as a partial replacement for sand in the production of cement-stabilized base course materials. In this paper, the performance, economic and environmental benefits of cement-stabilized tailings sand-gravel base material (CSTSM) with various TS content were comprehensively studied. The results indicate that the mechanical properties, drying shrinkage strain and durability of CSTSM decreased with the increasing TS content (0%-30%) while adhering to the necessary engineering requirements (UCS>2.4 MPa). The TS inclusion reduces hydration product coverage, decreases compactness and increases porosity, resulting in reduced strength and durability of CSTSM. When the TS content is below 16%, the deterioration in mechanical properties and durability of CSTSM under dry-wet, freeze-thaw and sulfate corrosion conditions is relatively minor, sufficiently meeting with the heavy traffic demands on highway subgrades (UCS>4 MPa). Moreover, when compared to ordinary cement-stabilized base course materials, the use of TS reduces the cost and CO2 emissions. After a comprehensive comparison of performance, economic benefits and environmental factors, a 16% TS substitution ratio is recommended for achieving optimal outcomes. Utilizing CSTSM in subgrade engineering is promising and environment-friendly approach for large-scale solid waste treatment and achieving carbon neutrality goals.

Keyword :

Durability properties Durability properties Microstructure Microstructure Road base Road base Sustainability analysis Sustainability analysis Tailings sand Tailings sand

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GB/T 7714 Que, Yun , Jia, Shenghui , Wang, Lun et al. Substitution of Tailings Sand in Cement-Stabilized Gravel Base Material for Road Construction: Mechanical Properties, Durability, and Microstructure [J]. | JOURNAL OF MATERIALS IN CIVIL ENGINEERING , 2025 , 37 (4) .
MLA Que, Yun et al. "Substitution of Tailings Sand in Cement-Stabilized Gravel Base Material for Road Construction: Mechanical Properties, Durability, and Microstructure" . | JOURNAL OF MATERIALS IN CIVIL ENGINEERING 37 . 4 (2025) .
APA Que, Yun , Jia, Shenghui , Wang, Lun , Fang, Lei , Mu, Honglin . Substitution of Tailings Sand in Cement-Stabilized Gravel Base Material for Road Construction: Mechanical Properties, Durability, and Microstructure . | JOURNAL OF MATERIALS IN CIVIL ENGINEERING , 2025 , 37 (4) .
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Combined effects of low-heat cement, expansive agent and shrinkage-reducing admixture on drying shrinkage and cracking of concrete SCIE
期刊论文 | 2025 , 22 | CASE STUDIES IN CONSTRUCTION MATERIALS
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Abstract :

The cracking of double-block ballastless track slab concrete has become a critical issue, which can be mitigated through the use of low-heat Portland cement (LC), a MgO-based expansive agent (ME), and a shrinkage-reducing admixture (SR). However, the combined effects of these three components on shrinkage cracking of concrete have not yet been studied. In this paper, the drying shrinkage deformation, cracking risk index (eta), and microstructure of ordinary concrete and LC concrete with different contents of ME and SR are systematically studied. The findings indicate that LC decreases the cracking risk of concrete by approximately 38.7 % compared to ordinary Portland cement (PC). By generating expansion crystals and reducing the surface tension of pore solution, both ME and SR can further inhibit the shrinkage of LC, thereby improving the crack resistance of LC-concrete. A significant synergistic shrinkage reduction effect of ME (8 %) and SR (2 %) on LC-concrete is demonstrated, reducing the cracking risk by around 51.04 %. The combined use of SR and ME promotes the formation of more elongated brucite crystals, enhancing particle interaction and improving the cracking resistance of LC. These findings offer essential insights for designing concrete with high crack resistance, ensuring that the cracking risk index remains below the acceptable threshold.

Keyword :

Concrete for track slab Concrete for track slab Cracking risk Cracking risk Low-heat cement Low-heat cement Magnesium oxide expansion agent Magnesium oxide expansion agent Shrinkage reducing agent Shrinkage reducing agent

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GB/T 7714 Fang, Lei , Fu, Dabao , Yuan, Qiang et al. Combined effects of low-heat cement, expansive agent and shrinkage-reducing admixture on drying shrinkage and cracking of concrete [J]. | CASE STUDIES IN CONSTRUCTION MATERIALS , 2025 , 22 .
MLA Fang, Lei et al. "Combined effects of low-heat cement, expansive agent and shrinkage-reducing admixture on drying shrinkage and cracking of concrete" . | CASE STUDIES IN CONSTRUCTION MATERIALS 22 (2025) .
APA Fang, Lei , Fu, Dabao , Yuan, Qiang , Xu, Song , Zhang, Dong , Cai, Huangyi et al. Combined effects of low-heat cement, expansive agent and shrinkage-reducing admixture on drying shrinkage and cracking of concrete . | CASE STUDIES IN CONSTRUCTION MATERIALS , 2025 , 22 .
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Investigation on aging resistance performance of asphalt modified with organic layered double hydroxides and antioxidants SCIE
期刊论文 | 2025 , 725 | COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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Abstract :

Asphalt undergoes thermal-oxidative and ultraviolet (UV) aging in its lifespan, yet current research tends to emphasize the enhancement of asphalt's resistance to only one type of aging, which hinders the improvement of its overall durability. In order to improve the resistance of asphalt to thermal-oxidative and ultraviolet aging, LDHs and antioxidants were utilized to modify asphalt based on the concept of physical shielding and chemical blocking. Moreover, to boost the compatibility between LDHs and asphalt, LDHs were organically modified using salicylic acid (SA) and sodium sodium dodecyl benzene sulfonate (SDBS). The composite effect of organic LDHs and antioxidants (Irganox 1076 and Irganox 1010) was investigated through physical and rheological tests. Also, thermal-oxidative and UV aging tests were utilized to evaluate the effectiveness of organic LDHs and antioxidants. Results show that SDBS and SA can be effectively intercalated into the LDHs, which improves the compatibility between LDHs and asphalt. LDHs, as a rigid component, increases the shear resistance of asphalt, which contributes to improved high-temperature performance but diminishes its flexibility. Organic modification can mitigate this drawback. In contrast, antioxidants exhibit a softening effect on asphalt. Organic LDHs and antioxidants can simultaneously boost the resistance of asphalt to UV and thermal-oxidative aging, with no interference observed between the two. Besides, the composite effect between SDBS-LDHs and Irganox 1076 is limited, whereas the composite effect of SA-LDHs and Irganox 1010 shows the most notable improvement. This can be attributed to the composite mechanism in which SA-LDHs provides physical shielding and Irganox 1010 chemically blocks the chain aging process of asphalt. These findings provide novel insights into the improvement of asphalt and asphalt pavement durability through a combined physical and chemical strategy.

Keyword :

Antioxidants Antioxidants Asphalt Asphalt Organic layered double hydroxides Organic layered double hydroxides Performance evaluation Performance evaluation

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GB/T 7714 Xu, Song , Niu, Xiangjie , Wang, Jiazhu et al. Investigation on aging resistance performance of asphalt modified with organic layered double hydroxides and antioxidants [J]. | COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS , 2025 , 725 .
MLA Xu, Song et al. "Investigation on aging resistance performance of asphalt modified with organic layered double hydroxides and antioxidants" . | COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS 725 (2025) .
APA Xu, Song , Niu, Xiangjie , Wang, Jiazhu , Cai, Shaoxu , Ma, Hongyan , Fang, Lei et al. Investigation on aging resistance performance of asphalt modified with organic layered double hydroxides and antioxidants . | COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS , 2025 , 725 .
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Investigation on active rejuvenation mechanism of aged SBS modified bitumen: Insights from experiments and molecular dynamics SCIE
期刊论文 | 2025 , 238 | POLYMER DEGRADATION AND STABILITY
WoS CC Cited Count: 3
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Abstract :

SBS modified bitumen (SMB) is widely used for its excellent physical and rheological properties, but it is susceptible to aging due to exposure to environmental factors such as heat, light, and oxygen. This aging process involves bitumen aging and SBS degradation, which complicates the rejuvenation of SMB. In order to explore the rejuvenation mechanism of aged SMB, particularly emphasizing the rejuvenation effects of epoxy compounds (BUDGE, TMPGE, and RDGE), a combination of molecular dynamics simulation and experiments was employed. The thermodynamic, chemical, and physical properties of rejuvenated SMB were analyzed. Results show that BUDGE and its repaired SBS exhibit excellent flexibility compared to TMPGE, improving cohesive energy density and free volume of aged bitumen, which facilitates recovery of ductility in aged SMB. Conversely, SBS repaired with RDGE increases cohesive energy density of aged SMB while reducing free volume, which enhances stiffness of bitumen. Additionally, rigid groups in RDGE inhibit mobility of both itself and the repaired SBS, leading to a reduction in the ductility of aged SMB to 10.1 cm. Besides, SBS repaired with RDGE shows strongest binding with resins and aromatics, which diminishes lubricating effect of these components on asphaltenes. This reduction in lubrication enhances aggregation of asphaltenes, ultimately raising flow resistance.

Keyword :

Epoxy compounds Epoxy compounds Molecular dynamics simulation Molecular dynamics simulation Rejuvenated SBS modified bitumen Rejuvenated SBS modified bitumen Rejuvenation mechanism analysis Rejuvenation mechanism analysis

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GB/T 7714 Xu, Song , Niu, Xiangjie , Cai, Shaoxu et al. Investigation on active rejuvenation mechanism of aged SBS modified bitumen: Insights from experiments and molecular dynamics [J]. | POLYMER DEGRADATION AND STABILITY , 2025 , 238 .
MLA Xu, Song et al. "Investigation on active rejuvenation mechanism of aged SBS modified bitumen: Insights from experiments and molecular dynamics" . | POLYMER DEGRADATION AND STABILITY 238 (2025) .
APA Xu, Song , Niu, Xiangjie , Cai, Shaoxu , Xu, Bingtao , Fang, Lei , Cao, Zhilong et al. Investigation on active rejuvenation mechanism of aged SBS modified bitumen: Insights from experiments and molecular dynamics . | POLYMER DEGRADATION AND STABILITY , 2025 , 238 .
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Novel reactive rejuvenation strategy for aged SBS modified bitumen based on molecular structure modulation SCIE
期刊论文 | 2025 , 239 | POLYMER DEGRADATION AND STABILITY
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Abstract :

The aging of SBS modified bitumen (SMB) involves bitumen aging and SBS degradation. Traditional rejuvenators restore bitumen properties by rebalancing its chemical composition but fail to repair damaged SBS. Some reactive rejuvenators can repair damaged SBS, improving low temperature performance of rejuvenated SMB but compromising high temperature stability. In order to achieve rejuvenated SMB with excellent high and low temperature performance, an aliphatic epoxy compound (1,6-hexanediol diglycidyl ether, HDE), aromatic epoxy compounds (resorcinol diglycidyl ether, RDGE; 2,2-bis (4-glycidyloxyphenyl) propane, DGEBA; N, N, N', N'tetraglycidyl-4,4 '-diaminodiphenylmethane, MBDA), a catalyst (Pentaethylenehexamine, PEHA) as well as biooil were utilized to develop a novel composite reactive rejuvenation system. The optimal composition of rejuvenation system was determined through physical properties test, followed by rheological test to evaluate rheological properties of rejuvenated SMB. The rejuvenation effect of the composite system was demonstrated using FTIR and FM tests, and the molecular dynamics simulation was conducted to explore the composite reaction rejuvenation mechanism of aged SMB. Results show that the combination of HDE and DGEBA presents superior effectiveness compared to others. SBS repaired with HDE exhibits enhanced flexibility, allowing for greater molecular chain rearrangement, which leads to a looser molecular structure and increased free volume fraction, enabling rejuvenated SMB to maintain better deformability at low temperatures. The incorporation of DGEBA introduces rigid groups that constrain molecular chain conformation and slippage, rotation, or stretching between chain segments, which reduces the free volume fraction and improves deformation resistance. Besides, SBS repaired with DGEBA shows stronger interactions with asphaltenes, better restricting their mobility and enhancing the rigidity of bitumen. At an HDE:DGEBA ratio of 1:1, with a total dosage of 5 wt % by weight of bitumen, the composite reactive rejuvenation system restores crosslinking network of SBS in bitumen and achieves rejuvenated SMB with excellent high and low temperature performance.

Keyword :

All-component rejuvenation All-component rejuvenation Molecular dynamics simulation Molecular dynamics simulation Performance evaluation Performance evaluation Rejuvenation mechanism analysis Rejuvenation mechanism analysis SBS modified bitumen SBS modified bitumen

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GB/T 7714 Xu, Song , Niu, Xiangjie , Pan, Shilong et al. Novel reactive rejuvenation strategy for aged SBS modified bitumen based on molecular structure modulation [J]. | POLYMER DEGRADATION AND STABILITY , 2025 , 239 .
MLA Xu, Song et al. "Novel reactive rejuvenation strategy for aged SBS modified bitumen based on molecular structure modulation" . | POLYMER DEGRADATION AND STABILITY 239 (2025) .
APA Xu, Song , Niu, Xiangjie , Pan, Shilong , Xu, Bingtao , Cai, Shaoxu , Fang, Lei et al. Novel reactive rejuvenation strategy for aged SBS modified bitumen based on molecular structure modulation . | POLYMER DEGRADATION AND STABILITY , 2025 , 239 .
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Frequency Dependency and Constitutive Model of Dynamical Mechanical Properties of Cement Asphalt Binders SCIE
期刊论文 | 2024 , 36 (6) | JOURNAL OF MATERIALS IN CIVIL ENGINEERING
WoS CC Cited Count: 2
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Using the dynamic mechanical thermal analysis (DMTA) method, the frequency dependence of dynamic mechanical properties of cement asphalt (CA) binders were examined within the testing frequency range between 0.1 and 100 Hz in this study. Based on the time-temperature superposition (TTS) principle, the master curves of storage modulus (E '), loss modulus (E ''), and loss factor (tan delta) of CA binders within a wide frequency range from 1 x 10-5 to 1 x 1010 Hz were obtained. The results showed that the E ', E '', and tan delta of CA binders were highly sensitive to the frequency due to the incorporation of asphalt. The value of E ' rose as the frequency increased, whereas E '' and tan delta showed different trends as the frequency increased. Storage modulus rising factor Delta E ' and peak value of loss factor tan delta max could be used to characterized the frequency dependence of dynamic mechanical properties. A simple solid model with fractional derivation was established to characterize the dynamic viscoelastic behavior of CA binders and was in excellent agreement with experiment data over both testing and a wide range of frequency. Correlations were observed between model parameters and asphalt content of CA binders. Our results contribute to the current field by providing the evidence for the dynamic mechanical properties estimation of CA mortar under various loading frequency.

Keyword :

Cement asphalt (CA) binders Cement asphalt (CA) binders Constitutive model Constitutive model Dynamic mechanical thermal analysis (DMTA) method Dynamic mechanical thermal analysis (DMTA) method Loss factor Loss factor Storage modulus Storage modulus

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GB/T 7714 Fang, Lei , Huang, Jianghuai , Chen, Zhen et al. Frequency Dependency and Constitutive Model of Dynamical Mechanical Properties of Cement Asphalt Binders [J]. | JOURNAL OF MATERIALS IN CIVIL ENGINEERING , 2024 , 36 (6) .
MLA Fang, Lei et al. "Frequency Dependency and Constitutive Model of Dynamical Mechanical Properties of Cement Asphalt Binders" . | JOURNAL OF MATERIALS IN CIVIL ENGINEERING 36 . 6 (2024) .
APA Fang, Lei , Huang, Jianghuai , Chen, Zhen , Zhang, Bisheng , Xu, Song , Lu, Jiacheng . Frequency Dependency and Constitutive Model of Dynamical Mechanical Properties of Cement Asphalt Binders . | JOURNAL OF MATERIALS IN CIVIL ENGINEERING , 2024 , 36 (6) .
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Application of reactive rejuvenator in aged SBS modified asphalt regeneration: A review SCIE
期刊论文 | 2024 , 421 | CONSTRUCTION AND BUILDING MATERIALS
WoS CC Cited Count: 21
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Abstract :

SBS modified asphalt (SBSMA) pavements have gained popularity worldwide due to their prominent performance. However, its maintenance and reconstruction projects will produce a large amount of reclaimed asphalt pavement (RAP) during the long-term service of asphalt pavement. Adding rejuvenators products is a common method to recycling RAP. However, conventional rejuvenators are typical component regulators applicable to recycling unmodified asphalt, while there is a poor regeneration effect for the aged SBS modified asphalt (ASBSMA), because it cannot repair the degraded SBS polymer. Fortunately, reactive rejuvenator (RR) has achieved this breakthrough based on the research findings in recent years. It contains special compounds that have the ability to repair the degraded SBS. The vital questions to be investigated in the present review are how the four current systems of RR (epoxy system, isocyanate system, compound system and polymer system) affect ASBSMA's properties and how well does its regeneration effect. Existing research indicated that RRs are favorable for the regeneration of A-SBSMA and have their respective characteristics. This review summaries various RR different regeneration mechanism, and analyzed its effects on physical properties, rheological properties, high and low temperature properties, and microscopic characteristics of A-SBSMA. Although research on RR is still in its infancy with a limited number of relevant studies, they show an excellent regeneration effect for A-SBSMA and hold a promising prospect. Overall, this review provides information on the feasibility of using RR as a sustainable SBSMA rejuvenator to promote conserving resources and reusing RAP.

Keyword :

Microscopic characteristics Microscopic characteristics Physical properties Physical properties Reactive rejuvenator Reactive rejuvenator Re-crosslinking SBS polymer Re-crosslinking SBS polymer Regeneration mechanism Regeneration mechanism Rheological properties Rheological properties SBS modified asphalt SBS modified asphalt

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GB/T 7714 Xu, Song , Tang, Guangming , Pan, Shilong et al. Application of reactive rejuvenator in aged SBS modified asphalt regeneration: A review [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 421 .
MLA Xu, Song et al. "Application of reactive rejuvenator in aged SBS modified asphalt regeneration: A review" . | CONSTRUCTION AND BUILDING MATERIALS 421 (2024) .
APA Xu, Song , Tang, Guangming , Pan, Shilong , Ji, Zhiyuan , Fang, Lei , Zhang, Canlin et al. Application of reactive rejuvenator in aged SBS modified asphalt regeneration: A review . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 421 .
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Investigation of aging behaviors of asphalt under the coupling conditions of salt and water SCIE
期刊论文 | 2024 , 365 | FUEL
WoS CC Cited Count: 12
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Abstract :

The thermal-oxidative aging of asphalt is extensively researched in recent years. However, the aging behavior of asphalt in salt and water environment receives less attention. A virgin asphalt binder was treated by various coupling conditions of salt and water in this work aiming at understanding the aging behaviors, and then the physical indexes, rheological parameters, chemical structures, four fractions and contact angles of asphalt before and after aging were measured to evaluated the effects of different aging environments on the physicochemical properties of asphalt. Results indicate that the aged asphalt has higher softening point and complex modulus while lower penetration and phase angle in comparison with unaged asphalt, implying the asphalt becomes harder and more brittle after aging. Although asphalt aged in salt and water conditions exhibits similar changes in macro-properties to thermal-oxidative aged asphalt, the analysis of chemical composition indicates that the aging of asphalt under salt and water environment is caused by unique inducements, which can be divided into two parts, that is, separating out of aromatics and saturates from asphalt by combined action of salt out and emulsification, and increasing of asphaltenes and resins caused by oxidation. These two factors work together leading to the change of colloidal structure and finally cause the deteriorate of macro-properties. Besides, the results of contact angle test indicate the increasing polar functional groups resulting from aging enhance hydrophily of asphalt and increase the possibility of water to enter the interior of asphalt, exacerbating the performance degradation of asphalt.

Keyword :

Aging evaluation Aging evaluation Asphalt Asphalt Colloidal structure Colloidal structure Polar functional groups Polar functional groups Salt-water coupling effect Salt-water coupling effect

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GB/T 7714 Xu, Song , Cai, Shaoxu , Huang, Runyu et al. Investigation of aging behaviors of asphalt under the coupling conditions of salt and water [J]. | FUEL , 2024 , 365 .
MLA Xu, Song et al. "Investigation of aging behaviors of asphalt under the coupling conditions of salt and water" . | FUEL 365 (2024) .
APA Xu, Song , Cai, Shaoxu , Huang, Runyu , Xu, Kangyi , Ma, Zirong , Fang, Lei et al. Investigation of aging behaviors of asphalt under the coupling conditions of salt and water . | FUEL , 2024 , 365 .
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A novel environmentally-friendly filler of the asphalt mastic: Organic modified waste shells SCIE
期刊论文 | 2024 , 470 | JOURNAL OF CLEANER PRODUCTION
WoS CC Cited Count: 3
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The shell farming industry generates significant waste shells annually, often improperly disposed of, causing environmental pollution. Concurrently, pavement engineering faces a shortage of limestone resources. Utilizing waste shells as a substitute for limestone fillers could simultaneously address both environmental and resource challenges. To analyze the feasibility of this strategy, this work collected the mussel, pectinid, oncomelania and oyster as the raw materials, and the method of organic modification was adopted on these shells to enhance the compatibility between the filler and asphalt. Asphalt. The physical and rheological properties of the prepared asphalt mastics were evaluated, and the modification effect was determined by the contact angle test and the surface energy parameters. Results indicated that the asphalt mastics with modified shells had higher penetration and ductility while lower softening point compared to the mastics with unmodified shells. Moreover, the modification with aluminate coupling agent had more significant impact on the physical properties of the asphalt mastics than that using amino silicone oil. For the rheological properties, shell asphalt mastics exhibited an extremely complex rheological behavior due to the various polarity and the organic content of the shell fillers. Besides, the contact angle of the shells increased after the modification, implying a better compatibility with asphalt. Moreover, the results of the surface energy parameters indicated that the non-polar component of the shells increased obvious after modification. In comparison with the conventional limestone, it can be found that the modified shells enhanced the adhesion between the aggregates and the asphalt mastics, which can improve the resistance of asphalt mixture to water damage. This work verifies the feasibility to replace the conventional mineral filler with modified shell filler, which was beneficial to recycling the waste shell and reducing the consumption of non-renewable mineral resources.

Keyword :

Asphalt mastic Asphalt mastic Filler Filler Organic modification Organic modification Physical and rheological properties Physical and rheological properties Waste shell Waste shell

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GB/T 7714 Xu, Song , Cai, Shaoxu , Zhang, Chanlin et al. A novel environmentally-friendly filler of the asphalt mastic: Organic modified waste shells [J]. | JOURNAL OF CLEANER PRODUCTION , 2024 , 470 .
MLA Xu, Song et al. "A novel environmentally-friendly filler of the asphalt mastic: Organic modified waste shells" . | JOURNAL OF CLEANER PRODUCTION 470 (2024) .
APA Xu, Song , Cai, Shaoxu , Zhang, Chanlin , Fang, Lei , Bian, Chongyu , Zou, Xiaobin et al. A novel environmentally-friendly filler of the asphalt mastic: Organic modified waste shells . | JOURNAL OF CLEANER PRODUCTION , 2024 , 470 .
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Comparative analysis of sulfate resistance between seawater sea sand concrete and freshwater desalted sea sand concrete under different exposure environments SCIE
期刊论文 | 2024 , 416 | CONSTRUCTION AND BUILDING MATERIALS
WoS CC Cited Count: 12
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Seawater sea sand concrete (SWSSC) is considered a potential solution to the shortage of river sand and freshwater resources in the coastal and island regions. Under the marine environment, the sulfate ions in the seawater and sea sand are detrimental to the properties of concrete. Due to the lack of systematic research on the sulfate attack characteristics of SWSSC exposed to different marine conditions, this study compare the sulfate resistance between SWSSC and freshwater desalinated sea sand concrete (FDC) under full immersion, semi -immersion, and dry -wet cycle exposure through the compressive strength, sulfate ion distribution, and microstructural changes after erosion. The findings showed that among the three different exposure conditions, the damage in SWSSC-F (fully immersion) was more severe than that in SWSSC-S (semi -immersion) and SWSSC-DW (dry -wet cycle). The SO42- concentration in inner SWSSC-F was 9.3% and 21.3% higher than that in SWSSC-DW and SWSSC-S, respectively. The microstructural analysis indicated that the higher amount of sulfate attack products and the leaching of Ca2+/OH- in SWSSC-F significantly damaged its microstructure. Besides, carbonation and physical crystallization in SWSSC-S and SWSSC-DW also refined their pore structure, thus enhancing their sulfate resistance. SWSSC showed better sulfate resistance than FDC under different marine exposure conditions in terms of lower erosion product content and better pore structure distribution after 12 months of erosion. The formation of Friedel's salt in SWSSC suppressed the formation of expansion products and reduced the erosion damage of concrete by SO42-.

Keyword :

Dry -wet cycle Dry -wet cycle Freshwater and desalinated sea sand concrete Freshwater and desalinated sea sand concrete Full immersion Full immersion Seawater sea sand concrete Seawater sea sand concrete Semi -immersion Semi -immersion Sulfate attack Sulfate attack

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GB/T 7714 Zhang, Dong , Jiang, Jianwei , Zhang, Zhiwen et al. Comparative analysis of sulfate resistance between seawater sea sand concrete and freshwater desalted sea sand concrete under different exposure environments [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 416 .
MLA Zhang, Dong et al. "Comparative analysis of sulfate resistance between seawater sea sand concrete and freshwater desalted sea sand concrete under different exposure environments" . | CONSTRUCTION AND BUILDING MATERIALS 416 (2024) .
APA Zhang, Dong , Jiang, Jianwei , Zhang, Zhiwen , Fang, Lei , Weng, Yiwei , Chen, Longhui et al. Comparative analysis of sulfate resistance between seawater sea sand concrete and freshwater desalted sea sand concrete under different exposure environments . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 416 .
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