Preparation method of fiber pervious recycled aggregate concrete

A technology of permeable concrete and recycled aggregates, applied in the field of construction engineering, can solve the problems of incomplete research and other problems, achieve the effects of improving weak joint surfaces, alleviating urban waterlogging problems, and improving overall performance

CN109534744APending Publication Date: 2019-03-29NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2019-03-29

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Abstract

The invention discloses a preparation method of fiber pervious recycled aggregate concrete. Specifically, waste C20 pavement is crushed by a jaw crusher, then artificial screening of recycled aggregate is conducted, and the fiber recycled aggregate pervious concrete meets that: in per cubic meter of chopped basalt fiber recycled aggregate pervious concrete, the ratio of aggregate to a cementing material is 4.5:1; the ratio of water to the cementing material is 0.3:1; and the content of chopped basalt fiber is 0.1%-0.3%. The invention designs and prepares the following 3 fiber situations: incorporation of chopped basalt fiber, chopped carbon fiber and polypropylene fiber, the incorporation of the 3 fibers has small influence on the permeability coefficient and porosity of recycled aggregatepervious concrete, but can effectively improve the splitting tensile strength and tension-compression ratio, has significant toughening and crack resistant effects, the comprehensive evaluation indexis the highest, and the pervious recycled aggregate concrete has the best overall performance.
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Description

technical field

[0001] The invention belongs to the field of construction engineering and relates to a method for preparing permeable concrete made of different fiber recycled aggregates. The invention is suitable for water conservancy, transportation and other projects that often bear tensile stress or repeated dynamic loads. Background technique

[0002] According to incomplete statistics, my country's annual construction waste is about 1.2-2.4 billion tons, accounting for about 70% of urban waste generation, and the output is astonishing. It is estimated that by 2020, the generation of construction waste in China will reach its peak and is expected to reach 2.6 billion tons. In order to solve the problem of rational utilization of construction waste, Chinese scholar Xiao Jianzhuang proposed "recycled concrete", which solved the problem of construction waste to a certain extent; with the birth of "sponge city", many scholars, in order to make more extensive use of construc...

Examples

Embodiment 1-3

[0036] Embodiment 1-3: Comparative analysis of the composition of three different fibers through experiments, and the comparative analysis of compressive strength, compressive splitting tensile strength and compressive splitting tensile strength are as follows.

[0037] 1 test procedure

[0038] 1.1 Test materials and mix ratio

[0039] The raw materials required for this test include mixing water (tap water), recycled aggregates are crushed from the C20 waste concrete pavement by a jaw crusher, and the aggregates with a particle size of 9.5-19.5 mm are screened to select chopped basalt fibers. (CBF), chopped carbon fiber (CFR) and polypropylene fiber (PFR), the water-binder ratio of recycled aggregate permeable concrete is set to 0.3, and the bone-binder ratio is 4.5. The detailed mix ratio and number are shown in Table 1. For the convenience of analysis, the three kinds of fibers mixed with recycled aggregate permeable concrete are uniformly coded according to the dosage le...