Plant fiber recycled concrete block and preparation method thereof

A technology for recycling concrete and concrete blocks, which is applied in solid waste management, sustainable waste treatment, climate sustainability, etc. The effect of strength enhancement and flexural strength improvement

Inactive Publication Date: 2016-05-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing concrete blocks do not make full use of both constructio

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0017] Specific embodiment 1: This embodiment provides a plant fiber recycled concrete block, the specific content is as follows:

[0018] 1. Design requirements of mix ratio

[0019] The mix ratio design should meet the "Design Regulations for Recycled Concrete Structures":

[0020] 1. Recycled concrete should be calculated by weight method.

[0021] 2. The total water consumption of recycled concrete is the sum of net water consumption and additional water consumption. When pre-wet treatment is used for recycled coarse aggregate, additional water consumption may not be considered.

[0022] 3. The determination of the net water consumption should be based on the slump and the maximum particle size of coarse aggregate, and the reference water consumption per unit volume of concrete should be increased by 5% according to JGJ5 of the "General Concrete Mixture Design Regulations".

[0023] 4. The additional water consumption should be determined according to the water absorption rate of th...

Example Embodiment

[0034] Specific embodiment two: This embodiment is different from specific embodiment one in that the ratio of recycled crushed stone to coarse aggregate is 50wt%, and the mass percentage of plant fiber (that is, the mass percentage of concrete block) is 2wt%.

[0035] The strength test was carried out on concrete test blocks without plant fiber and recycled aggregates and plant fiber recycled concrete blocks. The test mix ratio is C50 mix ratio. Due to the limitation of the experiment time, all test blocks were subjected to strength testing after seven days of ordinary curing, and then the 28-day strength was calculated according to the empirical formula.

[0036] The 7-day strength of ordinary concrete blocks without recycled aggregates and plant fibers is 36MPa, 37MPa, and 41.5MPa. According to the empirical formula, the strength of the block is proportional to the logarithm of the age, and it reaches the C50 strength after calculation.

[0037] The 7-day strength of the plant f...

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Abstract

The invention discloses a plant fiber recycled concrete block and a preparation method thereof. The block is made from water, cement, sand, coarse aggregate and plant fiber, wherein the coarse aggregate adopts the mixture of natural macadam and recycled macadam; the ratio of the recycled macadam to the coarse aggregate is 30 to 50 percent; the ratio of plant fiber to the concrete block is 1 to 2 percent. Compared with the existing recycled concrete block, the plant fiber recycled concrete block has the advantages that the plant fiber recycled concrete block not only utilizes construction waste as the coarse aggregate of concrete, and meanwhile is mixed with waste crops to combined with the coarse aggregate, although the compressive strength of the axis of the block is reduced to a certain extent as compared with the existing recycled concrete block without recycled aggregate mixed, the tensile strength of the concrete is improved due to the influence of the plant fiber, the strength meets the requirements, and the plant fiber recycled concrete block can be applied to load-bearing blocks.

Description

technical field [0001] The invention relates to a novel environment-friendly concrete block which uses recycled aggregate to replace a part of natural aggregate and is added with plant fibers and a preparation method thereof. Background technique [0002] Plant fiber recycled concrete is to use the waste concrete blocks removed from old buildings, after cleaning, crushing, screening and matching with each other in a certain proportion, it is re-mixed as part or all of the aggregate and a certain amount of waste plant plant fibers are added. of concrete. It is the reprocessing of waste concrete and waste crops to restore (or partially restore) their original performance and become a new building product. [0003] In recent years, with the rapid development of urban and rural construction in my country, a large number of abandoned crops such as straw are burned every year, which wastes resources and pollutes the air. A large number of houses and infrastructure are constantly ...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B18/16C04B18/24C04B20/10
CPCC04B20/1066C04B28/00C04B14/02C04B18/16C04B18/24Y02W30/91
Inventor 纪伦田玉滨郝宝奎
Owner HARBIN INST OF TECH
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