降粘型外加剂的复配及对水泥水化性能影响

摘要/Abstract

摘要： 高强、超高强混凝土的胶凝材料用量较大且水胶比较低,导致混凝土拌合物的粘度较大,工作性能较差,进而影响施工质量,因此本文复配出一种新型降粘型外加剂,以聚羧酸减水剂母液、消泡组分、引气组分、流变剂、缓凝组分、早强组分为复配功能小料,通过单因素试验和正交试验,研究不同组分对水泥净浆粘度、流动度以及水泥胶砂强度的影响,从而确定降粘型外加剂的最佳配比。通过水化热、XRD测试研究该降粘型外加剂对水泥水化放热和水化产物的影响。试验结果表明:降粘型外加剂的最佳制备工艺的质量比为m(减水剂母液)∶m(聚醚消泡剂)∶m(AE-Ⅱ)∶m(三萜皂甙)∶m(流变剂)∶m(三聚磷酸钠)∶m(六偏磷酸钠)∶m(葡萄糖酸钠)∶m(柠檬酸)∶m(硫代硫酸钠)∶m(硫酸钠)=1 000∶3.5∶0.5∶1.5∶4∶10∶5∶15∶5∶15∶10;当水泥浆体中掺入降粘型外加剂后,水泥水化放热速率得到延缓、水化产物生成量受到抑制。

关键词: 降粘型减水剂, 粘度, 流动度, 水化反应, 微观性能, 水泥净浆

Abstract: This study aimed to address the problem of high viscosity and poor workability of high-strength and ultra-high-strength concrete mixtures caused by high usage of binding materials and low water-binder ratios, which in turn affects construction quality, by developing a new type of reducing agent admixture. The reducing agent admixture was formulated using polycarboxylic acid water-reducing agent mother liquor, defoaming agents, air-entraining agents, rheological agents, retarders, and early-strength agents as functional additives. Single-factor experiments and orthogonal experiments were performed to investigate the effects of different components on the viscosity, flowability, and strength of cement paste and mortar, in order to determine the optimal ratio of the reducing agent admixture. The influence of the reducing agent admixture on hydration heat and hydration products of cement was investigated by conducting micro-tests on hydration heat and XRD. The experimental results show that the mass ratio of optimal preparation process for the reducing agent admixture is water reducer mother liquor∶polyether defoaming agent∶AE-II∶triterpenoid saponin∶rheological agent∶sodium tripolyphosphate∶sodium hexametaphosphate∶sodium gluconate∶citric acid∶sodium thiosulfate∶sodium sulfate=1 000∶3.5∶0.5∶1.5∶4∶10∶5∶15∶5∶15∶10. When a viscosity reducing admixture is added to the cement slurry, the heat release rate of cement hydration is delayed and the amount of hydration products is inhibited.

Key words: viscosity reducing water reducing agent, viscosity, fluidity, hydration reaction, microscopic property, cement paste

中图分类号:

TU528.042.2

王林, 杜艮坤, 潘月凡, 许钰波, 田喜颖, 郭宏. 降粘型外加剂的复配及对水泥水化性能影响[J]. 硅酸盐通报, 2024, 43(11): 3947-3957.

WANG Lin, DU Genkun, PAN Yuefan, XU Yubo, TIAN Xiying, GUO Hong. Effect of Compounding of Viscosity Reducing Admixtures on Hydration Performance of Cement[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(11): 3947-3957.

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