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Pervious concrete mix proportion design method based on paste membrane thickness

A technology of permeable concrete and mixing ratio design, which is applied in chemical instruments and methods, cement mixing devices, clay preparation devices, etc., can solve the problems of unguaranteed performance of permeable concrete, and achieve controllable effective porosity and superior comprehensive performance. , the effect of controllable porosity

Inactive Publication Date: 2019-02-15
SHANXI PROVINCIAL RES INST OF COMM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The industry standard "Technical Regulations for Permeable Cement Concrete Pavement" issued by my country in 2009 also adopted the volume method, but these methods have certain shortcomings from the macro level, and the performance of the prepared permeable concrete cannot be guaranteed.

Method used

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  • Pervious concrete mix proportion design method based on paste membrane thickness
  • Pervious concrete mix proportion design method based on paste membrane thickness
  • Pervious concrete mix proportion design method based on paste membrane thickness

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] (1) Raw material performance inspection:

[0063] P.O 42.5 ordinary Portland cement is selected, and the indicators all meet the requirements of "Highway Engineering Cement and Cement Concrete Test Regulations" (JTG E30-2005), and the density is 3100kg / m 3 ; Select limestone crushed stone with a single particle size of 4.75-9.5mm as coarse aggregate, "Highway Engineering Aggregate Test Regulations" (JTG E42-2005), and its apparent density is 2700kg / m2. 3 , the bulk density is 1600kg / m 3 , the void ratio is 40.7%; clean tap water is selected, and the density is 1000kg / m 3 .

[0064] (2) Determine the amount of coarse aggregate per unit volume:

[0065] Coarse aggregate dosage per unit volume of permeable concrete m g =α×ρ′ g =0.98×1600=1568kg.

[0066] (3) Calculation of total surface area of ​​coarse aggregate per unit volume:

[0067] The coarse aggregate adopts a single particle size range of 4.75-9.5 mm, and the sieve residual α of the aggregate with this part...

Embodiment 2

[0089] The preset porosity is 23.75%, which corresponds to the film thickness h of 500 μm. Other raw material types and parameters are the same as in Example 1.

[0090] Using the same calculation method as Example 1, the consumption of each raw material was obtained: cement 427.1kg, coarse aggregate 1568kg, water 106.8kg, water reducing agent 0.43kg.

Embodiment 3

[0092] The preset porosity is 20.00%, and the corresponding film thickness h is 350 μm. Other raw material types and parameters are the same as in Example 1.

[0093] Using the same calculation method as Example 1, the consumption of each raw material is obtained: cement 469.8kg, coarse aggregate 1568kg, water 117.4kg, water reducing agent 0.47kg.

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Abstract

The invention belongs to the technical field of the building material, and relates to a pervious concrete mix proportion design method based on paste membrane thickness. The method comprises the following steps: determining gravels dosage according to gravel natural stacking, determining a paste membrane thickness according to a porosity demand, determining the paste volume by combining the pastemembrane thickness and the gravel total surface area, and determining the dosage of each of the cement, the mineral admixture and the water according to the paste volume, and determining the dosage ofthe water-reducer according to the powder dosage, and comprehensively obtaining the pervious concrete mix proportion at last. The invention provides a paste membrane thickness-based pervious concretemix proportion design method capable of preparing the pervious concrete with controllable effective porosity and excellent comprehensive performance, suitable for promotion and application.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a method for designing a mix ratio of permeable concrete, in particular to a method for designing a mix ratio of permeable concrete based on the thickness of a slurry film. Background technique [0002] Pervious concrete is a porous structure with macroscopic continuous pores formed after setting and hardening, which is made of cement, coarse aggregate and water, without fine aggregate or with a small amount of fine aggregate. There are many pores inside permeable concrete, which has good water permeability and air permeability, so it has many advantages: 1. Rainwater can be quickly restored and replenished into groundwater, which improves the protection of water resources; 2. It can ensure the root system of plants and natural air moisture. The normal exchange of water provides a growth place for microorganisms and improves the natural ecological environment; ③ It is us...

Claims

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Application Information

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IPC IPC(8): C04B28/04B28C5/00
CPCB28C5/003C04B28/04C04B2201/50C04B14/28C04B2103/302C04B14/02
Inventor 边伟马昆林张翛张艳聪贺炯煌王帅刘志胜高学凯党晗菲
Owner SHANXI PROVINCIAL RES INST OF COMM
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