不同激发方式下NAC硬化水泥浆体的水化及力学性能研究  

Study on hydration and mechanical properties of NAC hardening cement under different excitation methods

作　　者：张士强 ZHANG Shiqiang(China Railway 16th Bureau Group Beijing Rail Transit Engineering Construction Co.,Ltd.,Beijing 101100,China)

机构地区：[1]中铁十六局集团北京轨道交通工程建设有限公司,北京101100

出　　处：《建筑结构》2025年第4期93-101,110,共10页Building Structure

基　　金：国家自然科学基金(51908342);中铁十六局公司级立项基金(2017-17C)。

摘　　要：为研究纳米凹凸棒黏土(NAC)对硬化水泥浆体水化反应及力学性能变化规律的影响,通过室内试验,分析了NAC硬化水泥浆体的力学性能、化学结合水含量、孔隙溶液pH值和孔隙率的变化规律,采用扫描电子显微镜揭示了不同激发方式下NAC对水泥基材料水化过程的影响机制。研究结果表明,煅烧原矿掺量为1%和3%的硬化水泥浆体在28d龄期时的化学结合水含量分别为14.11%和14.04%;煅烧原矿掺量为1%、3%和5%的硬化水泥浆体的孔隙率分别比不掺NAC的硬化水泥浆体降低19%、19.04%和22.27%。掺入1%煅烧原矿和煅烧高粘矿的硬化水泥浆体的抗折强度比不掺NAC的硬化水泥浆体提高了28.40%和17.28%,煅烧原矿在改善硬化水泥浆体力学性能方面优于高粘矿。To investigate the effect of nano attapulgite clay(NAC)on the hydration reaction and mechanical properties of hardened cement paste,the change rules in mechanical properties,chemically bound water content,pore solution pH value,and porosity of NAC hardened cement paste were analyzed by indoor experiments.Scanning electron microscopy was used to reveal the mechanism of NAC′s influence on the hydration process of cement⁃based materials under different excitation modes.The research results indicate that the chemically bound water content in hardened cement slurries with 1%and 3%calcined raw ore content at 28 days of age is 14.11%and 14.04%,respectively.The porosity of hardened cement slurry with 1%,3%and 5%calcined ore is decreased by 19%,19.04%and 22.27%compared to hardened cement pastes without NAC,respectively.The flexural strength of the hardened cement slurry with 1%calcined ore and calcined high viscosity ore is improved by 28.40%and 17.28%compared to the hardened cement slurry without NAC.The calcined ore is superior to the high viscosity ore in improving the mechanical properties of the hardened cement slurry.

关 键 词：纳米凹凸棒黏土 化学结合水 孔隙率 水泥水化 抗折强度 抗压强度 

分 类 号：TU525[建筑科学—建筑技术科学]