High-strength concrete prefabricated piece having both water permeability and water-retaining property

Abstract

PROBLEM TO BE SOLVED: To provide a concrete body having excellent water permeability and water retentivity and reinforced in mechanical strength such as crack resistance. SOLUTION: Porous aggregate such as water granulated slag, zeolite and volcanic rock, a water-absorbing resin such as a water-soluble polymer, a vitreous, metallic or high polymer fibrous material and a hardening material such as portland cement, ecocement, high strength cement or high-early-strength cement are kneaded to be hard with each other in a zero or low slump state, formed and placed.

Description

technical field [0001] The present invention relates to a concrete prefabricated part or a concrete construction object which has both water permeability and water retention and has enhanced crack resistance. Background technique [0002] A concrete paving material containing porous granular slag at a weight ratio of 2 to 10 per part by weight of Portland cement is known (see Patent Document 1). [0003] This paving material is considered to have instantaneous water permeability, alleviate the heat island phenomenon, and maintain groundwater, etc., but because (1) too much water is mixed during forming construction, the water permeability is relatively low; (2) it is compacted during forming construction. Excessive pressure will reduce water permeability; (3) lack of water retention, and long-term water retention cannot be expected; (4) prone to cracks; (5) low bending strength, not suitable for paving projects that are prone to bending stress. [0004] [Patent Document 1] ...

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Problems solved by technology

[0003] This paving material is considered to have instantaneous water permeability, alleviate the heat island phenomenon, and maintain groundwater, etc., but because (1) too much water is mixed during forming construction, the water permeability is relatively low; (2) it is compacted during forming construction. Excessive pressure will reduce water permeability; (3) lack of water retention, and long-term water retention cannot be expected; (4) prone to cracks; (5) low bending strength, not suitable for use in paving projects that are prone to bending stress

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