复合激发剂对碱矿渣胶结材水化进程及早期性能的影响

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英文篇名：Impact of Activator Mix Proportions on Hydration Process and Early-age Properties of Alkali-Activated Slag Binder 作者：杨凯 ; 张之璐 ; 杨永 ; 韩昊 ; 黄文聪 ; 朱效宏 ; 唐德莎 ; 李爽 ; 杨长辉 英文作者：YANG Kai;ZHANG Zhilu;YANG Yong;HAN Hao;HUANG Wencong;ZHU Xiaohong;TANG Desha;LI Shuang;YANG Changhui;College of Materials Science and Engineering,Chongqing University;China Communications 2nd Navigational Bureau 2nd Engineering Co,.Ltd.; 关键词：碱矿渣胶结材 ; 复合激发剂 ; 抗压强度 ; 水化进程 英文关键词：alkali-activated slag binder;;activator mix proportions;;compressive strength;;hydration process 中文刊名：CLDB 英文刊名：Materials Reports 机构：重庆大学材料科学与工程学院;中交二航局第二工程有限公司; 出版日期：2019-06-26 出版单位：材料导报 年：2019 期：v.33 基金：十三五国家重点研发计划(2017YFB0309905);; 国家自然科学基金(51778089;51708060)~~ 语种：中文; 页：CLDB201914010 页数：5 CN：14 ISSN：50-1078/TB 分类号：48-52

摘要

通过混料设计研究了水玻璃、碳酸钠、氢氧化钠和氢氧化钙四种激发剂在复合条件下对矿渣的激发作用及对碱矿渣胶结材(AAS)早期性能的影响。使用水化微量热仪、X射线衍射仪、综合热分析仪分析了AAS的水化过程。结果显示:在碱当量和水胶比一定的条件下,复合激发剂仅能在100～130 mm范围内调节AAS砂浆的初始流动度,但对AAS砂浆抗压强度的影响显著。氢氧化钠的激发作用在3 d以内最显著,水玻璃对强度的贡献主要体现在3 d后;各激发剂间的交互作用主要体现在3 d以内的抗压强度上。与水玻璃激发AAS相比,在激发剂中加入1. 5%碳酸钠会减缓AAS各龄期水化进程;加入3%氢氧化钙、1. 5%和3%氢氧化钠能分别加快AAS 1 d和3 d内的水化进程,但均会降低28 d的水化进程。此外,根据ANOVA方差分析得到的回归方程,提出了利用激发剂种类和比例来调节及控制AAS水化进程的技术途径。
        The effect of four different activators( water glass,sodium carbonate,sodium hydroxide,calcium hydroxide) on slag and early-age perfor-mance of alkali-activated slag binder were studied by mixture design. The hydration process of AAS was analysed by isothermal carlorimetry,X-ray diffraction and Thermogravimetry. The obtained results indicated that when alkali concentration and water to binder ratio kept constant,the initial fluidity of AAS mortar could be regulated only in the range of 100 —130 mm by activator mix proportions,while the compressive strength development of AAS mortar was strongly affected. The effect of sodium hydroxide on slag was significant before 3 d,while water glass governed compressive strength development after 3 d. The interactions between different activators were found mainly significant at early stage( before 3 d). Compared with sample activated by water glass,when 1. 5 % sodium carbonate was used to replace the same Na2 O concentration of water glass,the hydration process was delayed. The addition of 3 %calcium hydroxide,1. 5 % sodium hydroxide and 3 % sodium hydroxide could accelerate the hydration process of AAS at 1 d and 3 d respectively,but both reduced the hydration process at 28 d. Furthermore,equations derived from ANOVA regression analysis offered approaches to optimize the AAS hydration process through varying activator types and their proportions.

引文

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