Abstract
The present study aims to prepare resin-based permeable bricks with micron-sized pores using fine aggregate with a particle diameter of 0.08–0.6 mm and bisphenol-A epoxy resin, a polymer binder. The properties of the binder, the characteristic parameters of the aggregate, and the micro pore structure of the brick were studied in order to break through the limitations of traditional porous permeable materials. The dynamic mechanical properties of resin were analyzed by dynamic mechanical analysis (DMA). The frequency parameter of particle size of 10 kinds of aggregate from different regions were obtained by digital image processing, and the characteristic parameter (aggregate distribution coefficient α) was obtained by modified Gaussian distribution. The microstructure of porous brick was analyzed by scanning electron microscopy-energy-dispersive X-ray spectroscopy (SEM-EDS). The test results show: (1) the glass transition temperature (Tg) of the resin is 61 °C; (2) the parameters of aggregate particle group will affect the performance of porous permeable materials; (3) the minimum effective pore diameter of the permeable brick is 30 μm, the maximum permeable rate is and the compressive strength is 41.08 MPa. The conclusions of this study will provide an important reference for permeable materials in the micron-scale pore range and the selection of binder and aggregate materials.
Highlights
As a result of the process of global urbanization, more than 50% of the world’s population live in cities [1]
Many urban diseases have emerged during urban expansion, for example: air pollution caused by the concentration of transportation and industry; eutrophication and change of hydrological system caused by point source pollution into waters; changes in urban biodiversity [3]
Dynamic mechanical indexes of bisphenol-A epoxy resin can be obtained by dynamic mechanical analysis, such as storage modulus (E0 ), which indicates the elasticity of epoxy resin, and loss modulus (E”), which indicates the plasticity of epoxy resin, glass transition temperature (Tg) and loss factor
Summary
As a result of the process of global urbanization, more than 50% of the world’s population live in cities [1]. Researchers [22] proposed a porous permeable pavement system (PPS), which typically includes porous concrete, permeable asphalt, clay permeable brick and cement-based permeable brick [23,24,25,26,27,28], and their corresponding scenarios are light load urban roadway and pedestrian footpath that can bear the load of an urban pavement, and have the function of water permeability, drainage and water storage, which can solve the contradiction between hardened pavement and ecological pavement This kind of material plays a role of filtration in promoting hydrological recovery in urban environment. It has reference value for the research and design of permeable pavement materials
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