Recycled concrete block prepared from CO2 reinforced recycled powder

A technology for concrete blocks and recycled powder, which can be used in applications, household appliances, ceramic products, etc., and can solve problems such as reducing the performance of prepared concrete.

Active Publication Date: 2020-12-04
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, related studies have found that the incorporation of low-quality recycled powder significantly reduces the performance of prepared concrete. Therefore, it is urgent to develop performance-enhancing technologies suitable f

Method used

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  • Recycled concrete block prepared from CO2 reinforced recycled powder
  • Recycled concrete block prepared from CO2 reinforced recycled powder
  • Recycled concrete block prepared from CO2 reinforced recycled powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] First, prepare a CO 2 Strengthen the recycled powder, that is, place the waste concrete and waste mortar in the construction waste in 0.0224mol / L saturated Ca(OH) 2 Soak in the solution at 20°C for 1 hour to make the waste concrete and waste mortar fully absorb Ca(OH) 2 After solution, the waste concrete and waste mortar were taken out and placed in a blast dryer for the first drying at 50°C for 30 hours, dried to constant weight, and then ground by a ball mill for 1.5 hours to form a powder, and then the powder was used Mechanical high-strength vibration sieving to obtain the required recycled powder with a particle size of ≤45 μm. Among them, the strength of waste concrete ≥ C40. The strength of waste mortar ≥ M20.

[0086] Then the obtained regenerated powder was placed in CO 2 In the pressurized curing box, it is cured for 35 hours in a curing environment with a temperature of 20°C, a relative humidity of 60%, and a curing pressure of 0.3Mpa. After the carboniza...

Embodiment 2

[0089] According to the weight ratio of recycled concrete block, measure and take ordinary portland cement 100g, the CO prepared in embodiment 1 2 Strengthen regeneration powder sample 1*90g, fly ash 90g, carbonized blast furnace slag sample 1*300g in saturated surface-dry state, and 650g recycled coarse aggregate in saturated surface-dry state, perform the first slow stirring for 1-2 minutes, until the ingredients are evenly mixed. Then measure 70g of tap water, 2g of polycarboxylate water reducer, 1g of rosin soap foaming agent, 4g of water glass, and 1.8g of methyl cellulose. After mixing, add in 3 times, carry out rapid stirring for the second time for 2 minutes, and obtain admixture. The obtained mixture is poured under the conditions of temperature ≥ 20°C and relative humidity ≥ 80%, and then demoulded by mechanical pressing, and the standard curing is carried out at temperature ≥ 20°C and relative humidity ≥ 95% for 28 days to obtain concrete blocks Sample 1#.

[009...

Embodiment 3

[0092] According to the weight ratio of recycled concrete block, measure and take ordinary portland cement 100g, the CO prepared in embodiment 1 2 Strengthen regeneration powder sample 1*90g, fly ash 90g, carbonized blast furnace slag sample 1*300g in saturated surface-dry state, and 650g recycled coarse aggregate in saturated surface-dry state, perform the first slow stirring for 1-2 minutes, until the ingredients are evenly mixed. Then measure 70g of tap water, 2g of polycarboxylate water reducer, 3g of rosin-based air-entraining agent, 4g of water glass, and 1.2g of methylcellulose. After mixing, add in 3 times, and then stir rapidly for the second time for 2 minutes to obtain admixture. The obtained mixture is poured under the conditions of temperature ≥ 20°C and relative humidity ≥ 80%, and then demoulded by mechanical pressing, and the standard curing is carried out at temperature ≥ 20°C and relative humidity ≥ 95% for 28 days to obtain concrete blocks Sample 2#.

[0...

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Abstract

The invention provides a concrete block prepared from CO2 reinforced regenerated powder. The invention further provides a preparation method for preparing the concrete block by utilizing the CO2 reinforced regenerated powder. According to the concrete block prepared from the CO2 reinforced regenerated powder, the CO2 reinforced regenerated powder is used as an auxiliary cementing material, the carbonization maintenance reinforced industrial blast furnace slag is used as a fine aggregate, and the regenerated coarse aggregate is used as a coarse aggregate, so that the regenerated concrete blockis prepared; the method realizes full substitution and full regeneration of cementing materials and aggregates in concrete, can be used for preparing recycled concrete blocks meeting different strength requirements, reduces the production cost of block products, can meet functional requirements of sound insulation, heat insulation and the like, has the characteristics of simple process and the like, and is remarkable in economic benefit and suitable for large-scale popularization.

Description

technical field [0001] The invention belongs to the technical field of civil engineering materials, and relates to a recycled concrete block and a preparation method thereof, in particular to a 2 A recycled concrete block prepared by strengthening recycled powder and a preparation method thereof. Background technique [0002] With the acceleration of urbanization in my country, the discharge of construction waste in my country is increasing year by year. The disposal of traditional construction waste is mainly stacking and landfill, which inevitably causes a series of environmental and social problems. Therefore, it is urgent to carry out construction waste disposal. resource disposal. Considering that my country's construction waste contains a large amount of components such as waste concrete and waste mortar, the resource disposal technology of my country's construction waste at the present stage is mainly to crush and screen construction waste to produce recycled aggregat...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B38/10C04B40/02C04B111/52
CPCC04B28/04C04B2201/50C04B2111/00017C04B2111/52C04B2201/32C04B18/16C04B22/064C04B22/06C04B18/08C04B18/141C04B24/34C04B22/00C04B24/383C04B2103/302C04B38/10C04B40/0281
Inventor 肖建庄马志鸣段珍华丁陶
Owner TONGJI UNIV
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