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- 2018
再生骨料掺配比对再生透水混凝土性能的影响
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Abstract:
为研究再生骨料在透水混凝土（RPC）中的应用，选用废弃路面素混凝土块为再生骨料来源，设计2种系列，研究再生骨料透水混凝土中再生骨料掺配问题，即分别以粒径9.5~19.0 mm，再生骨料按0%、25%、50%、75%和100%（基准）质量替代同粒径天然骨料碎石（系列1）和以4.75~9.5 mm、9.5~19.0 mm两种粒径，再生骨料按0∶1、1∶1、1∶2、2∶1、2∶3和3∶2掺比（系列2）制备RPC，并分析其物理、力学、透水性能及其相互关系，得到了合理的再生骨料替代率和双粒级掺比，在1∶1和2∶1掺配下能够得到较好的强度及透水性能。通过切割试块的图像化处理，分析其孔隙分布特征和趋势，并将平面孔隙率、等效孔径和透水系数联系起来。结果表明，再生透水混凝土的透水能力主要取决于截面孔隙个数和面积。 In order to study the application of recycled aggregate in water permeable concrete, two series of researches on the recycled aggregate concrete made from waste pavement concrete were designed to study the influence of the proportion of recycled aggregates in recycled pervious concrete(RPC). That is, the recycled aggregates with particle size of 9.5-19.0 mm replaced the same size natural aggregate by 0%, 25%, 50%, 75% and 100% (standard) quality, respectively(series1). And RPC was designed by two kinds of particle size aggregates with 4.75-9.5 mm, 9.5-19.0 mm according to the ratio of 0:1, 1:1, 1:2, 2:1, 2:3 and 3:2(series 2).With this basis, its physical, mechanical, water permeability and their relationship were analyzed, and the reasonable rate of recycled aggregate and double particle size ratio were obtained. In the 1:1 and 2:1 blending can get better strength and water permeability. The pore distribution characteristics and trends were analyzed by the image processing of the cutting test block, and the plane porosity, equivalent pore size and water permeability coefficient were correlated. The results show that the number and area of cross-section pores play a key role in the permeable capacity of recycled pervious concrete. 国家自然科学青年基金项目（51309101）；国家自然科学基金面上项目（51679092）；河南省重大科技类项目（172102210372）
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