摘要
聚丙烯酰胺(PAM)对水泥水化及性能的影响限制了机制砂的规模化应用。本文研究了三种典型聚丙烯酰胺(PAM)与聚羧酸减水剂(PCE)、萘系减水剂(FDN)相互作用对水泥浆体早期性能的影响。研究发现,PAM与PCE、FDN相互作用会显著提升水泥浆体的剪切应力,对其流动性有负面影响。PAM的桥接效应减弱了PCE、FDN的静电斥力作用,束缚了部分可反应的自由水,降低了水泥浆体水化放热量和水化产物生成量。随着PAM掺量增加,PAM-PCE体系主要是纳米孔增加,但对强度影响较小,而PAM-FDN体系,孔隙增加集中在微米孔,强度下降显著。三种PAM中,阳离子PAM(APAM)与PCE、FDN的相互作用会显著抑制水泥水化产物的生成。
The effect of polyacrylamide(PAM) on cement hydration and performance limits the large-scale application of manufactured sand.In this paper,the effects of the interaction of three typical polyacrylamides(PAM) with polycarboxylate superplasticizer(PCE) and naphthalene superplasticizer(FDN) on the early performance of cement pastes were investigated.The study finds that the interaction of PAM with PCE and FDN significantly enhances the shear stress of cement paste,and negatively affects its fluidity.The bridging effect of PAM attenuates the electrostatic repulsive effect of PCE and FDN,and binds some of the reactive free water,which reduces the hydration release heat and hydration product generation of cement paste.With the increase of PAM doping,the PAM-PCE system mainly increases nanopores,but the effect on strength is small,while the increase in pores of the PAM-FDN system is concentrated in micrometer pores,and the strength decreases significantly.Among the three PAM,the interaction of cationic PAM(APAM) with PCE and FDN significantly inhibits the generation of cement hydration products.
作者
殷俊
钱雄
胡传林
YIN Jun;QIAN Xiong;HU Chuanlin(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
2024年第9期3118-3127,3202,共11页
Bulletin of the Chinese Ceramic Society
基金
湖北省重点研发计划(2023BCB083)。
关键词
聚丙烯酰胺
聚羧酸减水剂
萘系减水剂
水泥水化
孔隙特征
polyacrylamide
polycarboxylate superplasticizer
naphthalene superplasticizer
cement hydration
pore characteristic
