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学者姓名：林旭健
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Abstract ：
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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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 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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Abstract ：
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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硅磷酸钾镁水泥(MSPPC)是一种新型高性能磷酸镁水泥,与使用酸性磷酸二氢钾制成的普通磷酸钾镁水泥(MKPC)不同,其必要原材料包括碱性磷酸氢二钾、氧化镁和硅灰.MKPC不掺缓凝剂难以制备,而MSPPC由于凝结时间较长,无需使用缓凝剂即可制备,硬化后具有比MKPC更优异的力学性能,但其工作性能尚未能很好满足实际工程应用需求,可通过缓凝剂用量来调节凝结时间和流动性.硼砂是磷酸镁水泥常用的缓凝剂,但其具有潜在的毒性迫使人们需要寻找一种安全有效的替代品.本工作研究了葡萄糖酸钠(SG)掺量对MSPPC工作性能、抗压强度、水化温度、pH值、物相组成、孔隙率和微观形貌的影响,并建立了缓凝机理模型.结果表明,SG掺量越高,缓凝效果越显著,当SG掺量为6％时,初凝时间由12 min延长至30 min;净浆流动度由84 mm提升至142 mm;大于0.1 μm的孔占比减少,有效改善了孔径分布;水化产物的种类未发生改变,但3 d的抗压强度由64.3 MPa下降到53.9 MPa,下降了 16.2％,而56 d的抗压强度下降了 6.99％,不利影响减小.
Keyword ：
凝结时间 凝结时间 孔隙率 孔隙率 物相组成 物相组成 硅磷酸钾镁水泥 硅磷酸钾镁水泥 葡萄糖酸钠 葡萄糖酸钠
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| GB/T 7714 | 杨一哲 , 林旭健 , 许晓莹 et al. 葡萄糖酸钠对硅磷酸钾镁水泥基本性能的影响 [J]. | 材料导报 , 2024 , 38 (17) : 80-85 . |
| MLA | 杨一哲 et al. "葡萄糖酸钠对硅磷酸钾镁水泥基本性能的影响" . | 材料导报 38 . 17 (2024) : 80-85 . |
| APA | 杨一哲 , 林旭健 , 许晓莹 , 林恒舟 , 陈韦羽 , 叶财发 . 葡萄糖酸钠对硅磷酸钾镁水泥基本性能的影响 . | 材料导报 , 2024 , 38 (17) , 80-85 . |
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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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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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为研究阴离子型聚丙烯酰胺对磷酸钾镁水泥韧性的改善情况,以阴离子型聚丙烯酰胺改性磷酸钾镁水泥为研究对象,结合孔结构分析、扫描电子显微镜、X射线衍射等微观试验,研究不同掺量阴离子型聚丙烯酰胺对磷酸钾镁水泥的凝结时间、抗压强度、抗折强度、弯曲韧度因子、冲击能量等性能的影响.试验结果表明:掺入适量的阴离子型聚丙烯酰胺能改善改性磷酸钾镁水泥的韧性,当阴离子型聚丙烯酰胺掺量低于2.0％时,弯曲韧度因子随阴离子型聚丙烯酰胺掺量的增加而增大;掺入阴离子型聚丙烯酰胺后不会改变磷酸钾镁水泥的水化产物类型,但水化产物形貌和内部结构发生变化,阴离子型聚丙烯酰胺形成胶体穿插在结构内部,从而提高了磷酸钾镁水泥的韧性.综上,当阴离子型聚丙烯酰胺掺量为2.0％时,综合性能最优.
Keyword ：
磷酸钾镁水泥 磷酸钾镁水泥 阴离子型聚丙烯酰胺 阴离子型聚丙烯酰胺 韧性 韧性
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| GB/T 7714 | 黄乌燕 , 海莹 , 蔡雅宏 et al. 阴离子型聚丙烯酰胺改性磷酸钾镁水泥的韧性及微观结构 [J]. | 南昌大学学报（工科版） , 2024 , 46 (3) : 332-337 . |
| MLA | 黄乌燕 et al. "阴离子型聚丙烯酰胺改性磷酸钾镁水泥的韧性及微观结构" . | 南昌大学学报（工科版） 46 . 3 (2024) : 332-337 . |
| APA | 黄乌燕 , 海莹 , 蔡雅宏 , 林旭健 . 阴离子型聚丙烯酰胺改性磷酸钾镁水泥的韧性及微观结构 . | 南昌大学学报（工科版） , 2024 , 46 (3) , 332-337 . |
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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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