摘要
就无机纳米材料对房建防水混凝土的物理性能增强效果进行了研究,结果表明:掺入混凝土中的纳米SiO_(2),会逐渐导致其坍落度下降。详细来说,这一损失效应与纳米SiO_(2)掺量的递增紧密相关,混凝土的坍落度将呈现出明显的下降趋势,进而使得混凝土拌合物的流动性逐步减弱。添加了纳米SiO_(2)的PTFN-1.5、PTFN-2.5、PTFN-3.5的抗压强度显著提高,其中3 d抗压强度的提升尤为明显,增幅达到30%以上。当纳米SiO_(2)的掺入量不同时,试件的强度差异相对而言并不显著。纳米SiO_(2)通过填充混凝土中的众多孔隙,起到了细化作用,使混凝土微观结构更紧密,从而推动了强度的提升。在纳米SiO_(2)加入后,混凝土表层抗碳化能力比基准混凝土要低;在混凝土浇筑成型后,在碳化时间延长时,碳化反应进入表层,纳米SiO_(2)的加入能弱化混凝土的抗碳化性能。
It studies the physical performance enhancement effect of inorganic nanomaterials on building waterproof concrete.The results show that the addition of nano-SiO2 will cause a loss of slump in concrete,and the slump will significantly decrease with the increase of nano-SiO2 content.The flowability of the concrete mixture will gradually decrease.The compressive strength of PTFN-1.5,PTFN-2.5,and PTFN-3.5 with the addition of nano-SiO2 was significantly improved,with a three-day compressive strength increase of over 30%.The strength difference of specimens doped with different amounts of nano-SiO2 is relatively small.Nano-SiO2 fills and refines a large number of pores in concrete,making the microstructure of concrete denser and promoting the development of concrete strength.After the addition of nano-SiO2,the carbonation resistance of the concrete surface is lower than that of the benchmark concrete;After the concrete is poured and formed,as the carbonation time is prolonged,the carbonation reaction enters the inner layer,and the addition of nano-SiO2 can weaken the carbonation resistance of the concrete.
作者
严丽红
YAN Lihong(Architectural Design College,Shanxi Vocational University of Engineering Science and Technology,Jinzhong 030619,China)
出处
《混凝土》
北大核心
2025年第6期215-218,223,共5页
Concrete
基金
文旅融合视角下贫困山区传统地域建筑活化利用研究(22BG004)。
关键词
无机纳米材料
防水混凝土
物理性能
增强
inorganic nanomaterials
waterproof concrete
physical performance
enhance
