页岩陶粒泡沫混凝土性能与保温机理研究

发布时间：2018-05-11 02:09

本文选题：泡沫混凝土 + 页岩陶粒　；参考：《混凝土》2017年12期

【摘要】：试验制备了不同密度等级的页岩陶粒泡沫混凝土,并对其抗压强度、吸水率、抗冻性、干燥收缩、保温性能进行了研究,测试了模拟泡沫混凝土墙体的热工性能,并使用螺旋CT技术和扫描电子显微镜研究了页岩陶粒泡沫混凝土气孔分布情况,分析了保温机理。结果表明,随着泡沫加入量的增多,泡沫混凝土干密度、抗压强度和导热系数逐渐降低,而吸水率不断增大。当泡沫体积为23%时,制备的陶粒泡沫混凝土28 d抗压强度可达到11.7 MPa,干燥收缩较小,且具有较好的抗冻性;模拟泡沫混凝土墙体具有良好的热工性能,具有较小的传热系数和较大的质量热容阻。螺旋CT技术和扫描电子显微镜发现页岩陶粒泡沫混凝土含有大量的气孔,这些气孔与页岩陶粒内部的气孔共同作用,大幅度降低了混凝土导热系数,从而具有优良的保温性能。
[Abstract]:Shale ceramsite foam concrete with different density grades was prepared, and its compressive strength, water absorption, freezing resistance, drying shrinkage and thermal insulation properties were studied, and the thermal properties of simulated foam concrete wall were tested. The pore distribution of shale ceramsite foam concrete was studied by spiral CT and scanning electron microscope, and the heat preservation mechanism was analyzed. The results show that the dry density, compressive strength and thermal conductivity of foamed concrete decrease with the increase of foam content, but the water absorption rate increases. When the volume of foam is 23, the compressive strength of ceramic foamed concrete can reach 11.7 MPa in 28 days, the drying shrinkage is small, and the wall has better frost resistance, and the wall of simulated foam concrete has good thermal performance. It has smaller heat transfer coefficient and larger mass heat capacity resistance. Spiral CT technique and scanning electron microscope (SEM) show that shale ceramsite foamed concrete contains a large number of pores, which act together with the pores in shale ceramsite, which greatly reduce the thermal conductivity of concrete and thus have excellent thermal insulation performance.
【作者单位】：华北水利水电大学土木与交通学院;中国铁建港航局集团有限公司;中建七局第四建筑有限公司;
【基金】：河南省科技攻关计划项目(152102210118)
【分类号】：TU528.2

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