Porous concrete mix proportion design method

Abstract

The invention belongs to the technical field of construction materials, and particularly relates to a porous concrete mix proportion design method. The method includes the following steps that firstly, the composition of a cementitious material is determined; secondly, a compacting molding test is conducted on a to-be-prepared specimen, and the water-binder ratio is determined through the test and visual inspection; thirdly, aggregate gradation and the volume amount are determined through trial mixing; fourthly, an estimated cement use amount serves as the mid-value, five different cement use amounts are selected at the interval of 25 Kg / m<3>, concrete is mixed with cement in the five use amounts respectively, then compressive strength is solved through testing, a cement use amount and strength relation curve is drawn, the minimum cement use amount required for achieving the needed strength is obtained by means of the interpolation method, and then the cement use amount per unit volume and the stirring water use amount are determined; fifthly, the aggregate composition and the cement use amount are slightly adjusted so that the workability of a porous concrete mixture and the volume filling rate of cement beyond aggregate can be reasonable, and trail mixing and forming are achieved.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a design method of the mix ratio of porous concrete. Background technique [0002] Porous concrete, also known as sand-free concrete or macroporous concrete, is a skeleton-pore structure formed by using specific particle size aggregates as the skeleton and cementing materials wrapped on the surface of the aggregate particles as the cementing layer between the aggregate particles. concrete material. Since pores with different pore sizes can be formed by adjusting the aggregate particle size and the amount of cementing materials to meet different application needs, porous concrete is widely used in permeable pavement, vegetation growth, water purification, etc. Porous concrete has been relatively common in Europe, the United States, Japan and other countries and regions, and our country is in the development stage. [0003] With the proposal of building a s...

AI Technical Summary

Problems solved by technology

So far, there are still some problems and deficiencies in the mix ratio design method of porous concrete. In the standards and specifications that have a guiding role in the research of porous concrete materials, although the technical specification for permeable cement concrete pavement has given the mix ratio design method, it does not. Clear and clear, it is difficult to adopt directly, and many researchers have given their own design methods, but there is no unified and suitable method for construction designers to choose

In actual construction and use, porous concrete is mainly designed according to empirical methods, which hinders its application to some extent.