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Porous cement concrete using regenerative concrete aggregate

A technology of recycled concrete and cement concrete, which is applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve problems such as loose quality control, miscellaneous sources, and irregular classification management, so as to increase the use of channels, The effect of ensuring product quality and reducing the number of mining

Inactive Publication Date: 2009-04-15
NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, waste concrete can only be used for low value-added applications such as backfilling foundation pits due to its miscellaneous sources, irregular classification management, and lax quality control.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Use 350kg / m3 of PI52.5 Portland cement, 1550kg / m3 of recycled concrete aggregate, 105kg / m3 of water, 4.2kg / m3 of synthetic fiber, and 35kg / m3 of inorganic adhesive. Among them, the aggregate particle size of the recycled concrete is 5-8 mm, and the crushing value is 22%. First, mix the recycled concrete aggregate and synthetic fiber for 45 seconds, then add cement, inorganic binder and water and mix evenly.

[0015] The technical indicators achieved by permeable cement concrete are: water permeability 12.5mm / s, 28-day compressive strength 25Mpa, flexural strength 3.5Mpa.

Embodiment 2

[0017] Use PI52.5R Portland cement 250kg / m3, recycled concrete aggregate 1650kg / m3, inorganic cement 25kg / m3, water consumption 75kg / m3, polyacrylonitrile fiber 3kg / m3, and the particle size of recycled concrete aggregate is 5~ 8mm single gradation, crushing value is 22%. First, mix the recycled concrete aggregate and synthetic fiber for 45 seconds, then add cement, inorganic binder and water and mix evenly.

[0018] The technical indicators achieved by permeable cement concrete are: 13.5mm / s, 28-day compressive strength of 20MPa, and flexural strength of 3.1MPa.

experiment example 3

[0020] PI52.5 cement 400kg / m3, recycled concrete aggregate 1450kg / m3, inorganic cement zeolite 40kg / m3, water consumption 120kg / m3, polypropylene fiber 4.8kg / m3, among which the recycled concrete aggregate particle size is 5-8mm single Grain fraction, crushing value 22%. First, mix the recycled concrete aggregate and synthetic fiber for 45 seconds, then add cement, inorganic binder and water and mix evenly.

[0021] The technical indicators achieved by permeable cement concrete are: water permeability 9.5mm / s, 28-day compressive strength 28MPa, and flexural strength 3.7MPa.

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Abstract

The invention relates to water permeable cement concrete using recycled concrete as the aggregate, which has the raw material compositions with the weight parts of 250-400 parts of cement, 1500-2000 parts of recycled concrete aggregate, 25-40 parts of inorganic plastering agent and 2.5-5 parts of synthetic fiber, wherein, the recycled concrete aggregate has 5-12mm of unitary size fraction and 25 percent or smaller of crushing value. The ecological water permeable concrete has the advantages of increasing the service means of the high added value of waste concrete, reducing the mining quantityof natural aggregates, lowering the cost for confecting water permeable materials, improving the traffic safety factors of the road, improving the water circulation function of the environment and having the performance indexes meeting the requirements of the set mechanical performance and other technical indexes.

Description

technical field [0001] The invention relates to a permeable cement concrete using recycled concrete as aggregate. Background technique [0002] With the improvement of engineering level and the improvement of people's quality of life, the road construction presents the characteristics of ecologicalization and water permeability, which improves the ecological environment to a certain extent, and alleviates the poor temperature adjustment ability of the road surface under high temperature, loud noise, and drainage. Poor capacity and considerable effect on overexploitation of natural resources. [0003] Every year, due to the increase in urban traffic volume and the increase in the service life of roads, roads often have problems such as cracks and damage. If these waste concrete can be recycled and used for road paving without reducing performance, it will not only save costs. Reduce construction waste removal and treatment costs, but also reduce urban waste pollution. Howev...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B18/16
CPCC04B28/02C04B18/167C04B2111/00025C04B2111/00284C04B2111/0075C04B2111/00017Y02W30/91C04B14/02C04B16/06C04B14/047C04B14/106C04B16/0633C04B16/0658C04B20/0076C04B20/026
Inventor 孙家瑛孙倩
Owner NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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