A kind of recycled concrete and its preparation method
A technology of recycled concrete and recycled aggregate, applied in the field of concrete, can solve the problems of reduced interface transition zone performance, poor concrete compactness, poor mechanical properties, etc., and achieve the effects of good performance, low production cost, and low porosity
Active Publication Date: 2022-03-25
BEIJING JINYU CONCRETE
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- Abstract
- Description
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- Application Information
AI Technical Summary
Problems solved by technology
[0003] However, due to the large amount of hardened cement mortar attached to the surface of the recycled aggregate, the performance of the interface transition zone of the concrete is greatly reduced again, resulting in poor compactness, high porosity and poor mechanical properties of the concrete.
Method used
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Experimental program
Comparison scheme
Effect test
preparation example 1
[0063] The preparation method of nano strengthening liquid is:
[0064] At a temperature of 30°C, 10kg polycarboxylate superplasticizer, 0.2kg nano-SiO 2 , 0.3kg nano-Al 2 o 3 , 0.2kg nano-CaCO 3 and 0.4kg nanometer GNP were ultrasonically emulsified and dispersed for 20 minutes using an ultrasonic disperser to obtain a nanometer enhanced liquid.
preparation example 2
[0066] The preparation method of nano strengthening liquid is:
[0067] At a temperature of 32.5°C, 10kg polycarboxylate superplasticizer, 0.5kg nano-SiO 2 , 0.5kg nano Al 2 o 3 , 0.5kg nano-CaCO 3 and 0.5kg nano-GNP using an ultrasonic disperser for ultrasonic emulsification and dispersion for 25 minutes to obtain a nano-enhanced liquid.
preparation example 3
[0069] The preparation method of nano strengthening liquid is:
[0070] At a temperature of 35°C, 10kg of polycarboxylate superplasticizer, 0.8kg of nano-SiO 2 , 0.7kg nano-Al 2 o 3 , 0.8kg nano CaCO 3 and 0.6kg nanometer GNP were ultrasonically emulsified and dispersed for 30 minutes using an ultrasonic disperser to obtain a nanometer enhanced liquid.
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Abstract
The present application relates to the field of concrete, and specifically discloses a recycled concrete and a preparation method thereof. The recycled concrete includes 920-980 parts of recycled aggregates, 70-130 parts of cement, 0.84-1.6 parts of nano-reinforced liquid, 35-75 parts of water, 0.84-1.8 parts of steel fiber-PVA hybrid fibers, 4.5-9.3 parts of waste textile fibers, 0.7-1.3 parts of emery, 10-16 parts of soybean protein powder, and 4-8 parts of trehalose; its preparation method is: S1. Mix and stir nano-strengthened liquid, water and cement to obtain nano-strengthened slurry, and then soak the regenerated aggregate in After soaking in the nano-enhanced slurry for a period of time, filter and dry to obtain nano-enhanced regenerated aggregate; S2. Mix and stir the nano-enhanced regenerated aggregate with all other raw materials at a temperature of 20-30°C. The recycled concrete of the present application has small porosity, high density and strong mechanical properties.
Description
technical field [0001] The present application relates to the field of concrete, and more specifically, it relates to a recycled concrete and a preparation method thereof. Background technique [0002] Recycled concrete is a new concrete prepared by crushing, cleaning and grading discarded concrete blocks, mixing them with gradation in a certain proportion, partially or completely replacing coarse aggregates such as stones, and then adding cement and water. Using waste concrete as coarse aggregate can effectively recycle waste concrete, which can not only reduce the damage to the environment caused by solid waste, but also save resources such as sand and gravel, which is one of the important ways for the concrete industry to achieve sustainable development. [0003] However, due to the large amount of hardened cement mortar attached to the surface of the recycled aggregate, the performance of the interface transition zone of the concrete is greatly reduced again, resulting i...
Claims
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IPC IPC(8): C04B14/30C04B28/02
CPCC04B40/0039C04B28/02C04B2201/50C04B2111/0075C04B14/062C04B14/303C04B14/28C04B14/022C04B2103/302C04B18/16C04B14/48C04B16/0641C04B16/0683C04B14/42C04B18/248C04B14/324C04B24/14C04B24/38
Inventor 张全贵万维福田玲香
Owner BEIJING JINYU CONCRETE