合成过程中聚羧酸共聚物用量对纳米C-S-H晶核成核及其早强作用的影响  

Effect of Dosage of Polycarboxylate Copolymer Used in Synthesis Process on Nucleation and Early Strength of Nano C-S-H Seeds

作　　者：唐芮枫 崔素萍[2] 杨飞华[1] 王肇嘉[1] 王子明[2] TANG Ruifeng;CUI Suping;YANG Feihua;WANG Zhaojia;WANG Ziming(State Key Laboratory of Solid Waste Reuse for Building Materials,Beijing Building Materials Academy of Sciences Research,Beijing 100041,China;College of Materials Science and Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京建筑材料科学研究总院有限公司,固废资源化利用与节能建材国家重点实验室,北京100041 [2]北京工业大学,材料科学与工程学院,北京100124

出　　处：《硅酸盐通报》2024年第9期3128-3136,3202,共10页Bulletin of the Chinese Ceramic Society

基　　金：北京市科技计划(Z221100007522002)。

摘　　要：纳米水化硅酸钙/聚羧酸共聚物(C-S-H/PCE)晶核悬浮液是一种新型水泥混凝土早强剂,可以通过晶种成核作用,缩短水泥水化诱导期,促进水泥早期强度的发展。本文通过动态光散射仪(DLS)、电子透射显微镜(TEM)、有机碳分析仪(TOC)及热重测试(TGA)研究了合成过程中PCE用量对纳米C-S-H/PCE晶粒尺寸、形貌及PCE实际结合量的影响,并探究了不同用量PCE制备的纳米C-S-H/PCE晶核对水泥水化放热速率、流动性及早期强度的影响。结果表明:当PCE用量占纳米C-S-H/PCE晶核悬浮液的质量分数小于5.0%时,纳米C-S-H/PCE晶核平均粒径随着PCE用量的增加逐渐降低,团聚情况改善,呈现清晰的锡箔状形貌;当PCE用量增加到10.0%时,纳米C-S-H/PCE晶核粒径和形貌变化不大。TOC和TGA测试表明PCE用量为5.0%时,其在C-S-H上基本达到饱和吸附量。过量的PCE会降低纳米C-S-H/PCE晶核对水泥水化放热和早期强度的促进作用。Nano hydrated calcium silicate/polycarboxylate copolymer(C-S-H/PCE) crystal nucleus suspension is a new type of early strength agent for cement concrete.It can shorten the cement hydration induction period and promote the development of early strength of cement through crystal seed nucleation.This article investigated the effect of PCE dosage on the grain size,morphology,and PCE actual combined dosage of nano C-S-H/PCE using dynamic light scattering(DLS),electron transmission microscopy(TEM),organic carbon analyzer(TOC),and thermogravimetric analysis(TGA) during the synthesis process.The effects of different dosages of PCE on the hydration heat release rate,flowability,and early strength of cement with nano C-S-H/PCE seeds were also investigated.The results show that when the PCE dosage accounted for less than 5.0% of the mass fraction of nano C-S-H/PCE seeds suspension,the average particle size of nano C-S-H/PCE seeds gradually decreases with the increase of PCE dosage,and the agglomeration situation improves,gradually presenting a clear tin foil like morphology.When the amount of PCE increases to 10.0%,there is little change in the particle size and morphology of the nano C-S-H/PCE seeds.TOC and TGA tests show that when the PCE dosage is 5.0%,it basically reaches saturation adsorption capacity on C-S-H.Therefore,excessive PCE will reduce the promoting effect of nano C-S-H/PCE seeds on the hydration heat release and early strength of cement.

关 键 词：纳米晶核 水化硅酸钙 聚羧酸减水剂 早期强度 水泥水化 吸附 

分 类 号：TU528[建筑科学—建筑技术科学]