摘要
以α-高强石膏为原料,制备超耐水石膏基自流平砂浆。研究火山灰材料种类、配比、缓凝剂种类及掺量对石膏基自流平砂浆标准稠度、30 min流动度损失、凝结时间、绝干抗压强度、绝干拉伸黏结强度、收缩率、耐水性和软化系数的影响。结果表明,火山灰材料A、火山灰材料B、缓凝剂A和缓凝剂B的最佳配比为37.5∶12.5∶4∶0.12时,石膏基自流平砂浆的标准稠度为53%,初凝时间为61 min,终凝时间为126 min,30 min流动损失为3 mm,抗压强度为20.21 MPa,绝干拉伸黏结强度为1.169 MPa,收缩率为0.04%,各项指标均符合JC/T 1023-2007标准要求,软化系数为0.83。为进一步提高砂浆的耐水性能,研究了不同防水剂对石膏基自流平砂浆软化系数的影响,有机硅憎水剂浸泡后其软化系数可提升至0.9。
Super water-resistant gypsum-based self-leveling mortar was prepared by using α-high strength gypsum as raw material.The effects of the ratio of different kinds of pozzolanic materials and the contents of different kinds of retarders on the preparation of gypsum-based self-leveling mortar and its standard consistency,30 min fluidity loss,setting time,absolute dry compressive strength,absolute dry tensile bond strength,shrinkage,water-resistance and softening coefficient were studied.The results showed that when the optimum mass ratio of pozzolanic material A,pozzolanic material B,retarder A and retarder B was 12.5∶37.5∶4∶0.12,the standard consistency of gypsum-based self-leveling mortar was 13%,the initial setting time was 61 min,the final setting time was 126 min,the 30 min fluidity loss was 3 mm,the compressive strength was 20.21 MPa,the absolute dry tensile bond strength was 1.169 MPa,and the shrinkage was 0.04%.All the indexes meet the requirements of JC/T 1023-2007 standard,and the softening coefficient is 0.83.In order to further improve the water resistance of mortar,the effect of different waterproofing agents on the softening coefficient of gypsum-based self-leveling mortar was studied.It was found that the softening coefficient of gypsum-based self-leveling mortar could be increased to 0.9 after soaking in a silicone water-repellent agent.
作者
周俊先
熊宇帆
苏雪梅
谭宏斌
杨飞华
张吉秀
Zhou Junxian;Xiong Yufan;Su Xuemei;Tan Hongbin;Yang Feihua;Zhang Jixiu
出处
《非金属矿》
CSCD
北大核心
2021年第6期14-18,共5页
Non-Metallic Mines
基金
四川省科技厅项目(2020YFS0334)
固废资源化利用与节能建材国家重点实验室项目(SWR-2021-001)。
关键词
高强石膏
砂浆
火山灰材料
抗压强度
软化系数
high strength gypsum
mortar
pozzolanic material
compressive strength
softening coefficient
