Regenerated concrete block material and production method thereof

A technology of recycled concrete and production methods, applied in cement production, sustainable waste treatment, solid waste management, etc., can solve the problems of low efficiency of resource utilization of construction waste, achieve high environmental and economic benefits, and improve the utilization rate of resources , highly active effect

Inactive Publication Date: 2018-09-21
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Moreover, the recycling efficiency of construction waste in my country is still at a relatively low level. According to statistics, in recent years, the recycling efficiency of construction waste in China is about 5-10%, which is far lower than that of developed countries such as Europe, America and Japan (the recycling rate of construction waste can reach 90%) ), so it is urgent to develop a building material product that can absorb a large amount of construction waste recycling raw materials, and change the existing single mode of resource utilization that uses recycled aggregates to replace natural aggregates to prepare recycled concrete

Method used

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  • Regenerated concrete block material and production method thereof
  • Regenerated concrete block material and production method thereof
  • Regenerated concrete block material and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0096] Embodiment 1-3 and comparative example 1

[0097] According to the formula ratio, accurately weigh cement, active recycled powder, recycled fine aggregate, and recycled coarse aggregate and put them into a horizontal forced mixer for uniform mixing. Dry mix the above dry materials for 2 minutes, then add water and reduce water. Stirring was continued for 2 min after the preparation to obtain a mixture. Among them, according to the particle size of the active recycled powder, the amount of water reducer is additionally increased; the recycled fine aggregate and recycled coarse aggregate are subjected to surface saturation and surface drying treatment before mixing.

[0098] Then, the mixture is poured, molded by mechanical pressure, demolded, and cured to obtain the required recycled concrete blocks. Wherein, the conservation is selected from one or a combination of natural conservation or water spray conservation. Finally, recycled concrete blocks are obtained, with t...

Embodiment 4-6

[0102] According to the formula ratio, accurately weigh cement, active recycled powder, natural fine aggregate, recycled fine aggregate, recycled coarse aggregate, and natural coarse aggregate and put them into a horizontal forced mixer for uniform mixing. Stir for 2 minutes, then add water and water reducing agent and continue to mix for 2 minutes to obtain a mixture. Among them, according to the particle size of the active recycled powder, the amount of water reducer is additionally increased; the recycled fine aggregate and recycled coarse aggregate are subjected to surface saturation and surface drying treatment before mixing.

[0103] Then, the mixture is poured, molded by mechanical pressure, demolded, and cured to obtain the required recycled concrete blocks. Wherein, the conservation is selected from one or a combination of natural conservation or water spray conservation. Finally, recycled concrete blocks are obtained, with three types of specimens of 100mm*100mm*100...

Embodiment 7

[0106] Example 7 - Compressive Strength Properties of Recycled Concrete

[0107] The compressive strength of the samples obtained in the above-mentioned Examples 1-3 and Comparative Example 1 was measured, and the specific results are shown in Table 4. Table 4 shows the measured values ​​of compressive strength of concrete under different active regeneration powder mixing rates and different curing ages. It can be seen from the data in Table 4 that when the water-binder ratio is 0.40, the compressive strength of concrete decreases with the increase of the replacement rate of active recycled powder, but when the replacement rate of active recycled powder is 15%-30%, the strength decreases Not obvious; when the water-binder ratio is 0.50 and the curing age is 56d, the strength of Example 1 with an active regeneration powder replacement rate of 15% is slightly higher than that of Comparative Example 1, and the active regeneration powder replacement rate The intensity of Example ...

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Abstract

The invention provides a formula for preparing a regenerated concrete block material by using high activity regenerated powder and a regenerated aggregate. The invention further provides a productionmethod of the regenerated concrete block material based on a system of 'regenerated powder-regenerated coarse aggregate-regenerated fine aggregate'. The regenerated concrete block material prepared byusing the system of 'regenerated powder-regenerated coarse aggregate-regenerated fine aggregate' has excellent mechanical strength, the strength level range is 5-50 MPa, and the requirements of the concrete block material strength under different working conditions are met. The invention provides a novel developing route for the resource recycling of construction wastes. The performance of the regenerated powder is similar to the performance of mineral admixture such as fly ash and the like, the activity is higher, secondary hydration reaction of a cement-based material can be promoted to relieve the current situation of insufficient supplying of mineral admixture such as fly ash and the like, and the regenerated concrete block material has higher economic benefit and social benefit.

Description

technical field [0001] The invention belongs to the technical field of civil engineering materials, and in particular relates to a recycled concrete block and a production method thereof. Background technique [0002] Waste concrete and waste red bricks in construction waste account for about 80% of the total construction waste. Recycling waste concrete and waste red bricks to produce recycled raw materials is an effective way to reduce the total amount of construction waste. At this stage, the recycled raw materials produced in my country are mainly recycled fine aggregate with a particle size of 0.15-5mm and recycled coarse aggregate with a particle size of 5-31.5mm. That is, waste concrete and waste red bricks are crushed, cleaned and graded to produce recycled aggregates of different grades, and the concrete prepared by replacing some or all of the recycled coarse aggregates with natural aggregates such as sand and gravel becomes recycled aggregate concrete. ; Recycled ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B7/24C04B18/16
CPCC04B7/246C04B18/16C04B28/04C04B2111/00017C04B2103/302C04B14/068C04B14/048C04B14/14Y02W30/91Y02P40/10
Inventor 马志鸣肖建庄段珍华张青天
Owner TONGJI UNIV
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