再生块体混凝土叠合板应用的研究

Research on application of recycled lump concrete laminated slab

将再生块体混凝土技术应用于叠合板中可进一步推进“绿色建筑”的发展。开展了2个预制底板试件和2个叠合板试件的足尺抗弯试验,分别研究了再生块体在施工阶段和使用阶段对抗弯性能的影响。建立了预制底板的有限元模型,对再生块体取代率、尺寸和分布等参数进行了分析。结果表明,当再生块体混凝土的抗压强度不低于普通混凝土的抗压强度时,再生块体混凝土叠合板在施工和使用阶段均具有不弱于普通混凝土叠合板的抗弯性能;在施工阶段,凸出板面的再生块体使截面的中性轴上移,提高了试件的抗弯刚度和抗弯承载力;在使用阶段,再生块体的加入对抗弯性能的影响不显著。在预制构件厂现有的生产线上完成了30块再生块体混凝土预制底板的生产,并已应用于实际工程。

The application of recycled lump concrete technology in laminated slabs can further promote the development of "green buildings".Full scale flexural tests of two prefabricated bottom slab specimens and two laminated slab specimens were carried out on to study the influences of recycled lumps on the flexural behavior in the construction phase and usage phase,respectively.The finite element model of the prefabricated bottom slab was established,and the impacts of replacement ratio,size and distribution of the recycled lumps were analyzed.The results show that,when the compressive strength of recycle lump concrete is not lower than that of ordinary concrete,the flexural behavior of recycled lump concrete laminated slab is not weaker than that of ordinary concrete laminated slab both in the construction phase and usage phase.In the construction phase,the part of the recycled lumps protruding from the slab surface raises the neutral axis of the section,which can improve the flexural stiffness and flexural capacity of the specimen.In the usage phase,the recycled lumps have no significant effect on the flexural behavior.Thirty recycled lump concrete prefabricated bottom slabs were produced in the existing production line of prefabricated component factory and applied to actual engineering project.