摘要
再生混凝土可有效利用废弃混凝土,但其抗冻性远不如普通混凝土。羟丙基甲基纤维素(HPMC)为一种白色粉末状物体,化学性质稳定,不活跃。通过改变再生混凝土中HPMC和再生粗骨料的取代率,分别探索其不同取代率对再生混凝土质量损失率和相对动弹性模量的影响,进而得出再生混凝土的抗冻性。经试验可得:在一定范围内,HPMC对再生混凝土的抗冻性能有一定程度上的增强作用,在纤维素含量达到0. 6%时增强效果最好;然而,随着再生粗骨料含量的继续提高,再生混凝土的抗冻性能下降。
Waste concrete can be effectively utilized by recycled concrete, but its frost resistance is far inferior to that of ordinary concrete.Hydroxypropyl methyl cellulose (HPMC) is a white powder with inactive chemical property.In this study, by changing the substitution rates of HPMC and recycled coarse aggregate in recycled concrete, the effects of different substitution rates on the mass loss rate and the relative dynamic elastic modulus of recycled concrete were explored, and the frost resistance of recycled concrete was obtained.The results showed that, within a certain range, HPMC could enhance the frost resistance of recycled concrete, while the frost resistance was best when the content of cellulose was 0.6%.However, as the content of recycled coarse aggregate continued to increase, the frost resistance of the recycled concrete decreased.
作者
颜胜强
刘发明
麻洪蕊
YAN Sheng-qiang;LIU Fa-ming;MA Hong-rui(School of Resources and Civil Engineering, Suzhou University, Suzhou 234000, China)
出处
《辽东学院学报（自然科学版）》
CAS
2019年第2期138-143,共6页
Journal of Eastern Liaoning University:Natural Science Edition
基金
国家级大学生创新创业训练计划项目(201810379059)
安徽省高等学校省级质量工程大学生创客实验室建设计划项目(2016ckjh200)
宿州学院校级虚拟仿真实验教学中心项目(szxy2016xnfz01)
关键词
羟丙基甲基纤维素
质量损失率
相对动弹性模量
再生混凝土
hydroxypropyl methyl cellulose
mass loss rate
relative dynamic modulus of elasticity
recycled concrete
