- 目录
- 混凝土与制品
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构件用核壳型轻集料混凝土耐久性研究
作者：尚丽诗，戴绍斌，周铉棠，吴思遥，杨航
（武汉理工大学 土木工程与建筑学院，湖北 武汉 430070）
摘要：为了探究核壳型轻集料在轻质混凝土中的性能，在前期核壳型陶粒制备的基础上对比研究了相同强度等级（设计强度C30）轻集料混凝土和核壳型轻集料混凝土的抗压强度、抗渗性、抗冻性及抗碳化性。试验结果表明：核壳型轻集料混凝土的28 d抗压强度可达到45.59 MPa；相对渗透系数为0.35×10-6 mm/s，约为轻集料混凝土的1/5；经过100次冻融循环后核壳型轻集料混凝土的质量损失率为1.07%，强度损失率为3.85%；经过28 d碳化试验后，核壳型轻集料混凝土碳化不明显。对集料进行包壳处理后，可有效提高混凝土的力学性能和耐久性。
关键词：核壳型轻集料混凝土；抗压强度；抗渗性；抗冻性；抗碳化性
中图分类号：TU528.56 文献标识码：A 文章编号：1001-702X（2022）01-0041-04
Study on the durability of core-shell lightweight aggregate concrete for prefabricate
SHANG Lishi，DAI Shaobin，ZHOU Xuantang，WU Siyao，YANG Hang
（School of Civil Engineering and Architecture，Wuhan University of Technology，Wuhan 430070，China）
Abstract：This paper aims to explore the performance of core-shell lightweight aggregate in lightweight concrete. The compressive strength，impermeability，frost resistance，and carbonization resistance of core-shell lightweight aggregate concrete，lightweight aggregate concrete，and ordinary concrete with the same strength grade（design strength C30） were compared and studied. The test results show that the 28 d compressive strength of core-shell lightweight aggregate concrete can reach 45.59 MPa，the relative permeability coefficient of core-shell lightweight aggregate concrete is 0.35×10-6 mm/s，which is about 1/5 of that of lightweight aggregate concrete. After 100 freeze-thaw cycles，the mass loss rates of core-shell lightweight aggregate concrete is 1.07%，and the strength loss rates is 3.85%. After 28 days carbonization test，carbonization of core-shell lightweight aggregate concrete is not obvious. It can be seen that the mechanical property and durability of concrete can be effectively improved after the cladding treatment of aggregate.
Key words：core-shell lightweight aggregate concrete，compressive strength，impermeability，frost resistance，carbonation resistance