摘要
减小水泥基材料水灰比,提高胶凝材料含量是提高大掺量塑料砂浆力学性能的重要途径,然而,提高胶凝材料含量对大掺量塑料砂浆收缩性能的影响也不容忽视。使用PP塑料等体积替代20%砂子,研究不同水灰比对大掺量塑料砂浆物理性质、力学和收缩性能的影响。结果表明,减小水灰比可有效地补偿大掺量塑料砂浆力学强度,水灰比越小,则抗折强度和抗压强度均越高,近似呈线性关系。此外,水灰比越小,塑料砂浆微结构越密实,孔隙率较低,吸水率越小,密度越大。然而,水灰比越小,自收缩越大,干缩通常也越大。结合试验结果,优选水灰比为0.3或0.4。
A low water to cement ratio or high amount of cement in concrete usually contributes to a significant enhancement of the mechanical properties. However,the effect of increasing the content of cementitious materials on the shrinkage properties of large-volume plastic mortars cannot be ignored. The influence of w/c on the physical,mechanical and shrinkage properties of high volume plastic particles mortar (HVPPM) was investigated. Results reveal that a reduced w/c can effectively improve the mechanical strength of HVPPM in an almost linear tendency,including both the compressive strength and the rupture strength. Moreover,a low w/c is also found to be beneficial for gaining a denser microstructure with large density and low water absorption. However,a low w/c increases the autogenous shrinkage as well as the drying shrinkage prominently. Therefore,optimal w/c is determined as 0.3 or 0.4.
作者
陈佩圆
董大鹏
胡凡
张东磊
任翔
CHEN Pei-yuan;DONG Da-peng;HU Fan;ZHANG Dong-lei;REN Xiang(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,China;Hefei Construction Engineering Group Co.,Ltd.,Hefei 230088,China;Engineering Research Center of Underground Mine Construction,Ministry of Education,Anhui University of Science and Technology,Huainan 232001,China)
出处
《硅酸盐通报》
CAS
北大核心
2019年第5期1527-1531,共5页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金海外及港澳学者合作研究基金(51728201)
安徽省博士后基金(2017B150)
中国博士后基金面上项目(2018M632518)
安徽省高校自然科学研究项目(KJ2018A0074)
安徽理工大学青年科学研究基金(QN2017210)
关键词
大掺量塑料砂浆
抗压强度
抗折强度
自收缩
干缩
high volume plastic particles mortar
compressive strength
rupture strength
autogenous shrinkage
drying shrinkage