探索建筑垃圾绿色再生混凝土的强度特性机理

Exploring the strength characteristics mechanism of green recycled concrete from construction waste

随着城市化建设的快速发展,混凝土消耗量呈现持续增长的趋势,而建筑固体废物产生量也急剧上升。鉴于土地资源的有限性、环境污染的加剧、社会效益和经济效益的综合考量,国家倡导可持续发展和绿色环保的理念,将再生混凝土作为我国城市建筑发展的一个重要方向。通过对再生混凝土进行单轴压缩试验,研究了再生混凝土在受压时的应力变化规律。反弯段的极限峰值应变在相同加载速率条件下趋向稳定,这表明加载速率与极限峰值应力之间并没有显著关系。结果得出:在龄期和加载速率相同的情况下,配比不同的再生混凝土试块在上升段杨氏模量变化趋势一致,但与配合比参数关系不明显。

Along with the rapid development of urbanization,the consumption of concrete shows a trend of continuous growth,and the production of construction solid waste also rises sharply.In view of the limited land resources,the intensification of environmental pollution,and the comprehensive consideration of social and economic benefits,the state advocates the concept of sustainable development and green environmental protection,and regards the application of recycled concrete as an important trend of future urban construction and development.Through uniaxial compression test on construction waste recycled concrete,The results show that the maximum strain of recycled concrete is greater than that of common concrete.Under the same loading rate,the peak strain of reverse bend is stable,which indicates that there is no obvious relationship between the loading rate and the ultimate peak stress.Under the conditions of the same age and loading rate,The elastic modulus of rising section of RC test block with different mix proportion is similar,but there is no significant correlation with the design parameters of the mix ratio.