1.青海大学 土木工程学院，青海 西宁 810016;2.青海大学 青海省建筑节能材料与 工程安全重点实验室，青海 西宁 810016
张晓媛（1997—），女，青海海东人，青海大学硕士生.E-mail：3216977690@qq.com
吴成友（1986—），男，山东临沂人，青海大学教授，博士生导师，博士.E-mail：wuchengyou86@163.com
TU528.01
国家自然科学基金资助项目（52002202）； 中国科学院西部之光项目；青海省重点研发项目（2023-GX-105）
1.School of Civil Engineering， Qinghai University， Xining 810016，China;2.Qinghai Provincial Key Laboratory of Building Energy-Saving Materials and Engineering Safety， Qinghai University，Xining 810016，China
将Mg（OH）2作为煅烧MgO的前驱体，同时以在MgO中掺入H3BO3的方式引入杂质硼，采用水化热、X射线衍射仪（XRD）、扫描电镜（SEM）和压汞仪（MIP）等测试技术，研究矿物掺合料对含H3BO3的碱式硫酸镁水泥（BMSC）凝结硬化过程的影响机理.结果表明：未掺加矿物掺合料时，含H3BO3的BMSC水化放热速率较控制组慢、凝结硬化时间延长，且对BMSC的早期强度影响较大；掺加矿物掺合料后，含H3BO3的BMSC后期强度提高，其中外掺H3BO3的BMSC 强度提高更加显著，且进一步延缓了水化放热速率；掺加矿物掺合料后，含H3BO3的BMSC水化结晶相未发生改变，仍为5·1·7相和Mg（OH）2，孔隙率较低，原因是矿物掺合料发挥了微集料效应，填充了BMSC内部孔隙，使得内部结构更加致密.
Using Mg（OH）2 as the precursor of calcined MgO， the impurity boron was introduced into MgO in the form of H3BO3. The heat of hydration， X-ray diffractometer（XRD）， scanning electron microscope （SEM） and mercury intrusion porosimeter （MIP）were used to study and analyze the effect of adding mineral admixtures with the presence of H3BO3 on the setting and hardening process of basic magnesium sulfate cement （BMSC）. The results show that without adding the mineral admixture the early strength is lower， the coagulation hardening time is longer， and hydration heat release rate of BMSC containing H3BO3 is lowered. Whereas with the addition of mineral admixture the late strength of BMSC containing H3BO3 increases significantly， and the exothermic rate of the BMSC that contained H3BO3 is further lowered. After the addition of mineral admixture， the hydrated crystalline phase of BMSC containing H3BO3 remains primarily to be the 5·1·7 phase and Mg（OH）2， and the porosity is low because of the mineral admixture has a microaggregate effect， filling the internal pores of BMSC and increasing the density of the internal structure.
张晓媛,吴成友,张勇,陈宏度.矿物掺合料对含硼碱式硫酸镁水泥强度的影响[J].建筑材料学报,2023,26(3):221-227
复制
