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学者姓名：林旭健
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Abstract ：
The poor water resistance has long limited the widespread application of magnesium phosphate cement (MPC). This study utilized the high-alkaline of the MgO-SiO2-K2HPO4 system to activate slag and incorporated prewater-saturated pottery sand to prepare a water-resistant magnesium-based cement (SP-MSPC). The research primarily examined the effect of pottery sand on the water resistance and microstructure of SP-MSPC with different slag substitution rates. The results indicated that an increase in pottery sand content prolonged the setting time and reduced the fluidity of the paste. The incorporation of higher amounts of pottery sand decreased the mechanical properties of the matrix, but the addition of pottery sand effectively promoted paste hydration, particularly slag hydration, significantly enhancing the water resistance of the matrix. The water resistance coefficient of the S20-P6 matrix at 56 days was 72.42 %, a 61.86 % increase compared to the control group S0P0. This can be attributed to the internal curing effect of the pottery sand, which promotes paste hydration and the continuous formation of K-struvite crystals and the water-resistant M-S-H and C-(A)-S-H gels. The crystal and gel phases were bonded to each other and work synergistically with the dense filling effect of ultrafine slag particles, effectively filling the matrix pores and microcracks, blocking moisture transport channels, slowing the penetration of external moisture, and reducing the dissolution of K-struvite crystals and other hydration products aqueous environments. The incorporation of pottery sand promoted slag hydration enhanced the average polymerization degree of the C-(A)-S-H gel, and reduced the volume of macropores within the matrix.
Keyword ：
MgO-SiO 2-K 2 HPO 4 system MgO-SiO 2-K 2 HPO 4 system Microstructure Microstructure Pre-water-saturated pottery sand Pre-water-saturated pottery sand Slag Slag Water resistance Water resistance
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| GB/T 7714 | Yao, Pengpeng , Lin, Xujian , Wu, Yuzhong et al. Understanding the effect of pre-water-saturated pottery sand on the microstructure and water resistance of the slag-blended MgO-SiO2-K2HPO4 system [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2025 , 473 . |
| MLA | Yao, Pengpeng et al. "Understanding the effect of pre-water-saturated pottery sand on the microstructure and water resistance of the slag-blended MgO-SiO2-K2HPO4 system" . | CONSTRUCTION AND BUILDING MATERIALS 473 (2025) . |
| APA | Yao, Pengpeng , Lin, Xujian , Wu, Yuzhong , Ji, Tao , Liang, Yongning , Zhang, Hongru . Understanding the effect of pre-water-saturated pottery sand on the microstructure and water resistance of the slag-blended MgO-SiO2-K2HPO4 system . | CONSTRUCTION AND BUILDING MATERIALS , 2025 , 473 . |
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This study investigated the influence of drying shrinkage on the bond strength between alkali- activated steel slag (SS)/fly ash (FA) lightweight mortar (ASFLm) and concrete substrates. The alkali contents, defined as the mass ratio of Na2O in sodium hydroxide to the total mass of SS and FA, were set at 4 %, 6 %, 8 %, and 10 %. The compressive strength, drying shrinkage, fire resistance and bond strength of ASFLm were analyzed. Results indicated that increasing alkali content initially enhances bond strength, followed by a subsequent decline. The bond strength was maximum at 6 % alkali content with a value of 0.65 MPa. The drying shrinkage, porosity and micromechanical properties of ASFLm determined bond strength. Porosity decreased and the micromechanical properties increased when the alkali content increased from 4 % to 6 % because of the increment in the contents of C-A-S-H and C-N-A-S-H gel. Only a few microcracks were observed despite the increase in drying shrinkage, so the bond strength of ASFLm increased. ASFLm's elastic modulus improved when the alkali content increased from 6 % to 10 %. However, high drying shrinkage resulted in numerous microcracks in the ASFLm matrix. These microcracks decreased the microhardness and increased the porosity of ASFLm. Hence, the bond strength of ASFLm was reduced.
Keyword ：
Alkali-activated steel slag/fly ash lightweight Alkali-activated steel slag/fly ash lightweight Alkali content Alkali content Bond strength Bond strength Drying shrinkage Drying shrinkage mortar mortar
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| GB/T 7714 | Ma, Yu , Wang, Benjun , Zhang, Cuirong et al. Relationship of drying shrinkage and the bond strength between alkali-activated steel slag/fly ash lightweight mortar and concrete substrate: Phase assemblage and micro-mechanical property [J]. | JOURNAL OF BUILDING ENGINEERING , 2025 , 99 . |
| MLA | Ma, Yu et al. "Relationship of drying shrinkage and the bond strength between alkali-activated steel slag/fly ash lightweight mortar and concrete substrate: Phase assemblage and micro-mechanical property" . | JOURNAL OF BUILDING ENGINEERING 99 (2025) . |
| APA | Ma, Yu , Wang, Benjun , Zhang, Cuirong , Lin, Xujian , Yang, Yu , Chen, Zongyan et al. Relationship of drying shrinkage and the bond strength between alkali-activated steel slag/fly ash lightweight mortar and concrete substrate: Phase assemblage and micro-mechanical property . | JOURNAL OF BUILDING ENGINEERING , 2025 , 99 . |
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The existing fireproof coating on thick steel structures has many drawbacks, including its lack of environmental protection, susceptibility to detachment, prolonged drying duration, and intricate building procedures. In this study, magnesium potassium phosphate cement (MKPC) was selected for the development of inorganic fireproofing coatings, considering that it has better adhesion, fast hardening speed, and heat resistance compared to other cement-based materials. P/M (the mass ratio of dipotassium hydrogen phosphate to magnesium oxide) is the most important factor affecting the performance of MKPC, which indicates the ratio of the acid and base components of the system. When P/M changed, so did the content of hydration products (MKP). The experimental results demonstrate a direct correlation between the quantity of MKP and the performance of the coating. Consequently, the bonding and fire resistance mechanisms of MKPC coatings were investigated by studying the effect patterns of different P/M on the properties (bond strength, fire resistance limit, dry density, compressive strength) of MKPC fireproofing coatings in combination with microscopic tests such as SEM, TG-DSC, and MIP.
Keyword ：
bond strength bond strength fire resistance fire resistance Magnesium potassium phosphate cement Magnesium potassium phosphate cement steel structure fireproof coating steel structure fireproof coating
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| GB/T 7714 | Hu, Cheng , Lin, Xujian , Shao, Xiaoyan et al. Effect of phosphate-to-magnesium ratio on the performance of magnesium potassium phosphate cement-based steel fireproof coatings [J]. | JOURNAL OF THE CHINESE INSTITUTE OF ENGINEERS , 2025 , 48 (2) : 195-203 . |
| MLA | Hu, Cheng et al. "Effect of phosphate-to-magnesium ratio on the performance of magnesium potassium phosphate cement-based steel fireproof coatings" . | JOURNAL OF THE CHINESE INSTITUTE OF ENGINEERS 48 . 2 (2025) : 195-203 . |
| APA | Hu, Cheng , Lin, Xujian , Shao, Xiaoyan , Ji, Tao , Lin, Huangqi , Huang, Wuyan et al. Effect of phosphate-to-magnesium ratio on the performance of magnesium potassium phosphate cement-based steel fireproof coatings . | JOURNAL OF THE CHINESE INSTITUTE OF ENGINEERS , 2025 , 48 (2) , 195-203 . |
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The fire-retardant lightweight mortar spalling from the tunnel lining substrates can threaten the safety of vehicles. The use of steel slag (SS) in alkali-activated cement can reduce the carbon emission and cost of lightweight mortar. The effects of SS on the bond strength and the microstructure of the interface between alkali-activated SS/fly ash (FA) lightweight mortar (ASFm) and concrete substrates was studied. The SS contents, namely, the mass ratio of SS to the summation of FA and SS, were 0 %, 20 %, 40 %, 60 %, and 80 %. The properties of ASFm, including compressive strength, fire resistance and bond strength, were studied. Results demonstrated that the bond strength of ASFm increases and then decreases with the increase in SS content. The highest bond strength of 0.65 MPa was obtained at 40 % SS content. Bond strength was determined by the pore structure and micromechanical properties of the matrix. When the SS content was increased from 0 % to 40 %, the content of C-A-S-H gel and C-N-A-S-H gel contents increased, and the porosity was reduced; hence, the bond strength of ASFm became larger. When the SS content increased from 40 % to 80 %, SS acted as an inhibitor, which reduced the micromechanical properties and increased the porosity of ASFm; therefore, the bond strength of ASFm decreased. This achievement provides an alternative way for the application of SS in tunnels. © 2024 Elsevier Ltd
Keyword ：
Aluminum coated steel Aluminum coated steel Bond strength (materials) Bond strength (materials) Compressive strength Compressive strength Light weight concrete Light weight concrete Mortar Mortar Slag cement Slag cement Tunnel linings Tunnel linings
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| GB/T 7714 | Ma, Yu , Zhang, Cuirong , Lin, Xujian et al. Bond between alkali-activated steel slag/fly ash lightweight mortar and concrete substrates: Strength and microscopic interactions [J]. | Construction and Building Materials , 2024 , 449 . |
| MLA | Ma, Yu et al. "Bond between alkali-activated steel slag/fly ash lightweight mortar and concrete substrates: Strength and microscopic interactions" . | Construction and Building Materials 449 (2024) . |
| APA | Ma, Yu , Zhang, Cuirong , Lin, Xujian , Ye, Yongbin , Ye, Xiaoqing , Ji, Tao . Bond between alkali-activated steel slag/fly ash lightweight mortar and concrete substrates: Strength and microscopic interactions . | Construction and Building Materials , 2024 , 449 . |
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The poor water resistance of traditional magnesium phosphate cement (MPC) limits its wider application in engineering fields. So far, research on enhancing the water resistance of MPC has been relatively limited. Therefore, this paper optimizes the slag content based on magnesium silicon potassium phosphate cement to prepare slag-magnesium silicon potassium phosphate cement (S-MSPPC). The research results indicate that slag contains various active components, and its appropriate addition can refine the pore structure of the paste. With the increase in slag replacement rate, the paste setting time increases, and the fluidity decreases slightly. The hydration of silica fume to produce SiO(OH)3- and SiO2(OH)22- ions significantly enhances the alkalinity of the paste and provides conditions for activating the activity of the slag. The S-MSPPC hardened paste can maintain alkalinity for the long term. Moreover, the water resistance of the S-MSPPC paste was significantly improved while ensuring mechanical properties. The water resistance coefficients of S-20 with 20 % slag increased by 49.23 % and 40.64 % at 28 days and 56 days compared to the reference group S-0. This improvement was due to the participation of silica fume and slag in the hydration reaction to form M-S-H and C-(A)-S-H gels in the paste. These gel products fill the pores and microcracks in the paste, optimize the pore size distribution, reduce porosity, and enhance density. In addition, the alkaline environment within the paste effectively slows the dissolution rate of K-struvite in water, further enhancing the water resistance of S-MSPPC. © 2024 Elsevier Ltd
Keyword ：
Bulk Density Bulk Density Pore size Pore size Silica fume Silica fume Slag cement Slag cement
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| GB/T 7714 | Yao, Pengpeng , Lin, Xujian , Wu, Yuzhong et al. Influence of slag on water resistance of magnesium silicon potassium phosphate cement [J]. | Journal of Building Engineering , 2024 , 97 . |
| MLA | Yao, Pengpeng et al. "Influence of slag on water resistance of magnesium silicon potassium phosphate cement" . | Journal of Building Engineering 97 (2024) . |
| APA | Yao, Pengpeng , Lin, Xujian , Wu, Yuzhong , Ji, Tao , Liang, Yongning . Influence of slag on water resistance of magnesium silicon potassium phosphate cement . | Journal of Building Engineering , 2024 , 97 . |
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Abstract ：
将磷酸钾镁水泥用于钢结构防火涂料中,制备出一种性能优异的无机厚型钢结构防火涂料.研究磷镁比对磷酸钾镁水泥钢结构防火涂料(MFCS)的抗压强度、粘结强度和耐火性能的影响,并通过微观试验揭示其影响机理.结果表明,随着磷镁比的减小,MFCS的抗压强度、粘结强度和耐火性能先上升后下降.当磷镁质量比为1/3 时,水化产物MgKPO4·6H2O最多,MFCS在高温时吸收的热量最多,耐火性能最好,且浆体与骨料间的界面过渡区最密实,其抗压强度、粘结强度最好.
Keyword ：
磷酸钾镁水泥 磷酸钾镁水泥 磷镁比 磷镁比 粘结强度 粘结强度 耐火性能 耐火性能 钢结构防火涂料 钢结构防火涂料
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| GB/T 7714 | 林煌琪 , 邵晓燕 , 林旭健 et al. 磷镁比对磷酸钾镁水泥钢结构防火涂料性能的影响 [J]. | 福州大学学报（自然科学版） , 2024 , 52 (6) : 724-730 . |
| MLA | 林煌琪 et al. "磷镁比对磷酸钾镁水泥钢结构防火涂料性能的影响" . | 福州大学学报（自然科学版） 52 . 6 (2024) : 724-730 . |
| APA | 林煌琪 , 邵晓燕 , 林旭健 , 梁咏宁 , 胡成 , 王耀 et al. 磷镁比对磷酸钾镁水泥钢结构防火涂料性能的影响 . | 福州大学学报（自然科学版） , 2024 , 52 (6) , 724-730 . |
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Magnesium silicon potassium phosphate cement (MSPPC)is an innovative high-performance magnesium phosphate cement,which is different from ordinary magnesium potassium phosphate cement (MKPC)using acidic potassium dihydrogen phosphate. Its necessary raw materials include basic dipotassium hydrogen phosphate,magnesium oxide and silica fume. MKPC is difficult to prepare without retarder,while MSPPC can be prepared without retarder due to its long setting time. After hardening,MSPPC has better mechanical properties than MKPC,but its working performance has not been able to meet the needs of practical engineering applications. The setting time and fluidity can be adjusted by the amount of retarder. Borax is a commonly used retarder for magnesium phosphate cement,but its potential toxicity problems forces the need to find a safe and effective alternative. This study investigated the influence of sodium gluconate (SG)content on the performance,compressive strength,hydration temperature,pH value,phase composition,porosity,and microstructure of MSPPC,and established a model for the retarding mechanism. The results demonstrated that a higher SG content led to a more pronounced retarding effect. At the SG dosage was 6%,the initial setting time was extended from 12 min to 30 min,and the cement paste fluidity improved from 84 mm to 142 mm. The proportion of pores larger than 0.1 μm was reduced,effectively improving pore size distribution. Although the type of hydration products did not change,there was an adverse effect on the 3 d compressive strength,from 64.3 MPa to 53.9 MPa,a decreased by 16.2%,while the 56 d compressive strength decreased by 6.99% and the adverse effect was reduced. © 2024 Cailiao Daobaoshe/ Materials Review. All rights reserved.
Keyword ：
Cements Cements Compressive strength Compressive strength Mortar Mortar Phase composition Phase composition Silica fume Silica fume
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| GB/T 7714 | Yang, Yizhe , Lin, Xujian , Xu, Xiaoying et al. Effect of Sodium Gluconate on the Basic Properties of Magnesium Silicate Potassium Phosphate Cement [J]. | Materials Reports , 2024 , 38 (17) . |
| MLA | Yang, Yizhe et al. "Effect of Sodium Gluconate on the Basic Properties of Magnesium Silicate Potassium Phosphate Cement" . | Materials Reports 38 . 17 (2024) . |
| APA | Yang, Yizhe , Lin, Xujian , Xu, Xiaoying , Lin, Hengzhou , Chen, Weiyu , Ye, Caifa . Effect of Sodium Gluconate on the Basic Properties of Magnesium Silicate Potassium Phosphate Cement . | Materials Reports , 2024 , 38 (17) . |
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Silica fume (SF) is commonly used in producing magnesium potassium phosphate cement (MPC) and magnesium silicate hydrate cement (MSHC). However, its roles in magnesium cement would differ from each other when mono hydrogen phosphate was involved. This paper aims to find optimized compositions in MgO-K2HPO4 DKPSF system with comprehensive considerations of the micro and macro performances. Ternary contour maps were designed to determine the optimized proportions of MgO, DKP and SF. The hydration reaction mechanism was analyzed with a variety of techniques including XRD, SEM, TG-DTG and NMR. Magnesium cement containing 60-75 % dead-burnt MgO, 10-25 % DKP and 12.5-25 % SF exhibited excellent compressive strength and volume stability. K-struvite and M-S-H were confirmed to promote the hydration and hardening performance of the blended MgO-DKP-SF system with optimized proportions. An excess of soluble K+ from DKP may precipitate as KOH and then dissolute in solution, increasing pH and release of Si from SF.
Keyword ：
Hydration Hydration Magnesium potassium phosphate cement Magnesium potassium phosphate cement Magnesium silicate hydrate cement Magnesium silicate hydrate cement MgO-K2HPO4-SiO2 system MgO-K2HPO4-SiO2 system Microstructure Microstructure
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| GB/T 7714 | Sun, Huaqiang , Sun, Xiaochan , Kang, Sixiang et al. New magnesium cement optimized in MgO-K2HPO4-SiO2 system and its hardening performance [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 446 . |
| MLA | Sun, Huaqiang et al. "New magnesium cement optimized in MgO-K2HPO4-SiO2 system and its hardening performance" . | CONSTRUCTION AND BUILDING MATERIALS 446 (2024) . |
| APA | Sun, Huaqiang , Sun, Xiaochan , Kang, Sixiang , Lin, Xujian , Qian, Jueshi , Wu, Wenda . New magnesium cement optimized in MgO-K2HPO4-SiO2 system and its hardening performance . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 446 . |
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The fire-retardant lightweight mortar spalling from the tunnel lining substrates can threaten the safety of vehicles. The use of steel slag (SS) in alkali-activated cement can reduce the carbon emission and cost of lightweight mortar. The effects of SS on the bond strength and the microstructure of the interface between alkali-activated SS/fly ash (FA) lightweight mortar (ASFm) and concrete substrates was studied. The SS contents, namely, the mass ratio of SS to the summation of FA and SS, were 0 %, 20 %, 40 %, 60 %, and 80 %. The properties of ASFm, including compressive strength, fire resistance and bond strength, were studied. Results demonstrated that the bond strength of ASFm increases and then decreases with the increase in SS content. The highest bond strength of 0.65 MPa was obtained at 40 % SS content. Bond strength was determined by the pore structure and micro- mechanical properties of the matrix. When the SS content was increased from 0 % to 40 %, the content of C-A-S- H gel and C-N-A-S-H gel contents increased, and the porosity was reduced; hence, the bond strength of ASFm became larger. When the SS content increased from 40 % to 80 %, SS acted as an inhibitor, which reduced the micromechanical properties and increased the porosity of ASFm; therefore, the bond strength of ASFm decreased. This achievement provides an alternative way for the application of SS in tunnels.
Keyword ：
Alkali-activated steel slag/fly ash lightweight Alkali-activated steel slag/fly ash lightweight Bond strength Bond strength Microstructure Microstructure mortar mortar Steel slag content Steel slag content
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| GB/T 7714 | Ma, Yu , Zhang, Cuirong , Lin, Xujian et al. Bond between alkali-activated steel slag/fly ash lightweight mortar and concrete substrates: Strength and microscopic interactions [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 449 . |
| MLA | Ma, Yu et al. "Bond between alkali-activated steel slag/fly ash lightweight mortar and concrete substrates: Strength and microscopic interactions" . | CONSTRUCTION AND BUILDING MATERIALS 449 (2024) . |
| APA | Ma, Yu , Zhang, Cuirong , Lin, Xujian , Ye, Yongbin , Ye, Xiaoqing , Ji, Tao . Bond between alkali-activated steel slag/fly ash lightweight mortar and concrete substrates: Strength and microscopic interactions . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 449 . |
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Abstract ：
The poor water resistance of traditional magnesium phosphate cement (MPC) limits its wider application in engineering fields. So far, research on enhancing the water resistance of MPC has been relatively limited. Therefore, this paper optimizes the slag content based on magnesium silicon potassium phosphate cement to prepare slag-magnesium silicon potassium phosphate cement (S-MSPPC). The research results indicate that slag contains various active components, and its appropriate addition can refine the pore structure of the paste. With the increase in slag replacement rate, the paste setting time increases, and the fluidity decreases slightly. The hydration of silica fume to produce SiO(OH)3- and SiO2(OH)2alkalinity of the paste and provides conditions for activating the activity of the slag. The S-MSPPC hardened paste can maintain alkalinity for the long term. Moreover, the water resistance of the SMSPPC paste was significantly improved while ensuring mechanical properties. The water resistance coefficients of S-20 with 20 % slag increased by 49.23 % and 40.64 % at 28 days and 56 days compared to the reference group S-0. This improvement was due to the participation of silica fume and slag in the hydration reaction to form M-S-H and C-(A)-S-H gels in the paste. These gel products fill the pores and microcracks in the paste, optimize the pore size distribution, reduce porosity, and enhance density. In addition, the alkaline environment within the paste effectively slows the dissolution rate of K-struvite in water, further enhancing the water resistance of SMSPPC.
Keyword ：
C -(A)-S-H C -(A)-S-H cement cement Hydration characteristics Hydration characteristics Mechanical properties Mechanical properties Slag-magnesium silicon potassium phosphate Slag-magnesium silicon potassium phosphate Water resistance mechanism Water resistance mechanism
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| GB/T 7714 | Yao, Pengpeng , Lin, Xujian , Wu, Yuzhong et al. Influence of slag on water resistance of magnesium silicon potassium phosphate cement [J]. | JOURNAL OF BUILDING ENGINEERING , 2024 , 97 . |
| MLA | Yao, Pengpeng et al. "Influence of slag on water resistance of magnesium silicon potassium phosphate cement" . | JOURNAL OF BUILDING ENGINEERING 97 (2024) . |
| APA | Yao, Pengpeng , Lin, Xujian , Wu, Yuzhong , Ji, Tao , Liang, Yongning . Influence of slag on water resistance of magnesium silicon potassium phosphate cement . | JOURNAL OF BUILDING ENGINEERING , 2024 , 97 . |
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