摘要
为提高蒸养高铁相硅酸盐水泥(HFC)构件的抗侵蚀性能,推进HFC在海洋工程中的应用,本文通过力学性能测试、毛细孔测试、氯离子固化测试及X射线衍射等手段,研究了50℃蒸养条件下矿粉(SL)和粉煤灰(FA)对HFC水泥基材料毛细孔结构和抗侵蚀性能的影响。结果表明,由于SL具有较高的火山灰反应活性,掺入SL可以提高蒸养HFC砂浆的早期力学性能,同时降低HFC砂浆的28 d毛细孔率。掺入FA显著降低了HFC砂浆的早期力学性能,且后期强度增长缓慢,但FA的“微集料”效应导致HFC砂浆的毛细孔率降低。氯离子固化结果表明,SL促进了水泥对氯离子的物理吸附,而FA促进了水泥对氯离子的化学固化,SL和FA均提高了复合胶凝材料的氯离子结合能力。
To enhance the erosion resistance of steam curing high-ferrite Portland cement(HFC)elements and promote the application of HFC in marine engineering,the effects of slag(SL)and fly ash(FA)on the capillary pore structure and erosion resistance of HFC based materials were investigated under steam curing conditions at 50℃by means of mechanical properties tests,capillary pore tests,chloride binding tests and X-ray diffraction.The results show that the incorporation of SL improves the early mechanical properties of steam curing HFC mortar due to its higher pozzolanic reactivity,while reduces the 28 d capillary porosity of HFC mortar.The significant reduction of the early mechanical properties of HFC mortar is attributed to the incorporation of FA,inducing a slow strength gain in the later stage,whereas the capillary porosity of HFC mortar also decreases owing to the“micro aggregate”effect of FA.The chloride binding results indicate that SL and FA promote the physical adsorption and chemical binding of chloride by cement,respectively.Both SL and FA improve the chloride binding capacity of HFC composite cementitious materials.
作者
陈波
王伟鱼
丰雨秋
饶美娟
CHEN Bo;WANG Weiyu;FENG Yuqiu;RAO Meijuan(State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China;School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China)
出处
《硅酸盐通报》
CAS
北大核心
2023年第1期162-169,共8页
Bulletin of the Chinese Ceramic Society
基金
湖北省自然科学基金(2020CFB827)。
关键词
高铁相硅酸盐水泥
矿物掺合料
矿粉
粉煤灰
蒸养
毛细孔
氯离子固化
high-ferrite Portland cement
mineral admixture
slag
fly ash
steam curing
capillary pore
chloride binding
