摘要
为减少搅拌站废浆对环境影响和促进废浆回收利用,本文利用搅拌站废浆替代部分拌合水,通过凝结时间、抗压强度、电阻率、水化热、孔结构测试和水化产物分析,研究废浆对水泥水化硬化的影响。结果表明,掺入废浆后,试样的凝结时间缩短,抗压强度提高,DSC曲线中第二放热峰出现时间提前,3 d电阻率增大,水化产物生成量增多,孔隙率降低。废浆掺量越高,促凝效果越好,水化产物Ca(OH)_(2)生成量越高。当废浆掺量为100%(质量分数)、放置时间为12 h时,试样的初凝时间和终凝时间较空白组分别缩短了69和87 min, 28 d龄期时Ca(OH)2生成量增多,对试样强度提升效果最佳,较空白组3 d强度提升了36.2%,7 d强度提升了32.7%,28 d强度提升了8.1%。
In order to reduce the environmental impact of waste slurry from the mixing station and promote the recycling of waste slurry,the influence of waste slurry on hydration and hardening process of cement was studied through the setting time,compressive strength,resistivity,hydration heat,pore structure test and hydration product analysis and by using waste slurry to replace part of mixing water.The results show that after adding waste slurry,the setting time of sample is shortened,the compressive strength increases,the second exothermic peak in the DSC curves appears in advance,3 d resistivity increases,the amount of hydration products increases,and the porosity decreases.The higher waste slurry content is,the better the effect of coagulation is,and the higher hydration product Ca(OH)_(2) content is.When waste slurry content is 100%(mass fraction)and the storage time is 12 h,the initial setting time and the final setting time of sample are shortened by 69 and 87 min,respectively,compared with the blank group.At the age of 28 d,the production of Ca(OH)2 increases,and the improving effect of strength of sample is the best,which increases by 36.2%at 3 d,32.7%at 7 d,and 8.1%at 28 d compared with the blank group.
作者
丁正
廖国胜
廖宜顺
何军林
胡思达
DING Zheng;LIAO Guosheng;LIAO Yishun;HE Junlin;HU Sida(School of Urban Construction,Wuhan University of Science and Technology,Wuhan 430065,China;Institute of High Performance Engineering Structure,Wuhan University of Science and Technology,Wuhan 430065,China;Hubei Provincial Engineering Research Center of Urban Regeneration,Wuhan 430065,China;Nanchang Huidie Concrete Co.,Ltd.,Nanchang 330006,China;The First Construction Engineering Limited Company of China Construction Third Engineering Bureau Co.,Ltd.,Wuhan 430040,China)
出处
《硅酸盐通报》
CAS
北大核心
2024年第3期1039-1047,共9页
Bulletin of the Chinese Ceramic Society
基金
湖北省建设科技计划项目(厅头〔2022〕2198号-64)
国家自然科学基金(51608402)。
关键词
废浆
抗压强度
水化
电阻率
水化热
孔结构
waste slurry
compressive strength
hydration
electrical resistivity
hydration heat
pore structure
