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Recycled concrete self-heat-preservation building block and manufacturing method thereof

A technology of recycled concrete and self-insulation blocks, which is applied in the field of insulation blocks, can solve the problems of unsatisfactory stability, strength and thermal insulation performance, and has not achieved very good results.

Inactive Publication Date: 2015-05-27
CHANGSHA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, scholars at home and abroad have carried out research on the material and structural properties of recycled concrete hollow blocks, but they have not achieved good results, and the stability, strength and thermal insulation properties are not ideal.

Method used

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  • Recycled concrete self-heat-preservation building block and manufacturing method thereof
  • Recycled concrete self-heat-preservation building block and manufacturing method thereof
  • Recycled concrete self-heat-preservation building block and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] This example uses the following materials:

[0053] Cement: choose 42.5R grade cement produced by a company in Changsha, Hunan. Coarse and fine aggregates: waste concrete from a road renovation project in Changsha, Hunan. To simplify the research, the concrete used in this test does not contain bricks, wood, glass, steel and other sundries. In order to meet the particle size requirements of coarse aggregate and fine aggregate for concrete preparation, waste concrete must be crushed. The preparation is to manually crush the waste concrete fragments to meet the particle size requirements of the crusher inlet, and then crush them with a crusher, and finally use a set of sieves to control the particle size within the range of 0.75mm to 20mm. Finally, screening is carried out, and the continuous gradation of 4.75mm-20mm is selected as coarse aggregate, and the continuous gradation of 0.75-4.75mm is fine aggregate. Water: tap water, in line with JGJ63-2006 "Concrete Water S...

Embodiment 2

[0059] The materials used in this example are the same as those in Example 1. The mix ratio of MU2.5 recycled concrete hollow blocks is: cement: water: recycled coarse aggregate: recycled fine aggregate: high-performance water reducer: fly ash The ratio is equal to 1: 0.56: 3.47: 1.87: 0.0075: 0.1; the mixing ratio of thermal insulation mortar is cement: water: recycled fine aggregate: perlite = 1: 0.68: 2.2: 0.28.

[0060] After the recycled concrete is mixed, it is formed by a special mold for test piece forming. After demoulding, fill the gaps of the hollow blocks with thermal insulation mortar. After 28 days of curing under natural conditions, the recycled concrete hollow blocks are sent for sample testing. The strength level of the test is MU2 .5. The test basis is "Ordinary Concrete Small Hollow Blocks" GB8239-1997, and the test results are shown in Table 2 below:

[0061] Table 2

[0062]

Embodiment 3

[0064] The materials used in this example are the same as in Example 1. The ratio of MU3.5 recycled concrete hollow blocks is: cement: water: recycled coarse aggregate: recycled fine aggregate: high-performance water reducer: fly ash mass ratio It is equal to 1: 0.50: 3.05: 1.63: 0.001: 0.05; the mixing ratio of thermal insulation mortar is cement: water: recycled fine aggregate: perlite = 1: 0.63: 2.2: 0.22.

[0065] After the recycled concrete is mixed, it is molded by a special mold for test piece molding. After demoulding, it is cured under natural conditions for 28 days and then made into a recycled concrete hollow block for sample testing. The strength level of the test is MU3.5. The testing basis is "Ordinary Concrete Small Hollow block "GB8239-1997, the test results are shown in the following table 3:

[0066] table 3

[0067]

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Abstract

The invention provides a recycled concrete self-heat-preservation building block and a manufacturing method thereof. The recycled concrete self-heat-preservation building block comprises a hollow recycled concrete block and heat-preservation mortar, wherein the hollow recycled concrete block is provided with a plurality of holes, and the heat-preservation mortar is poured into the holes of the hollow recycled concrete block and is solidified; the raw materials of the hollow recycled concrete block comprise cement, water, recycled coarse aggregate, recycled fine aggregate, a water reducer and pulverized fuel ash in the ratio of 1 to (0.4-0.6) to (2-3.5) to (1-2.5) to (0.005-0.03) to (0.05-0.3); the raw materials of the mortar comprise cement, water, recycled fine aggregate and pearlite in the ratio of 1 to (0.48-0.75) to (1.5-3.2) to (0.05-0.45). Because the crushed waste concrete is used as the recycled concrete aggregate and replaces natural sand, and the additive (a water reducer) and the admixture (pulverized fuel ash) are added, so that the workability of the recycled concrete mixture and the mechanical properties of the hollow block can be improved effectively, and the recycled concrete self-heat-preservation building block has high strength and stability. Because the holes of the hollow block are filled with the heat-preservation mortar, the recycled concrete self-heat-preservation building block has self heat preservation.

Description

technical field [0001] The invention relates to the technical field of thermal insulation blocks, and more specifically relates to a recycled concrete self-thermal insulation block and a manufacturing method thereof. Background technique [0002] After the reform and opening up, my country has entered an era of rapid technological and economic development. In the early days of liberation, the population growth rate was unprecedentedly fast. After entering the 21st century, the population pressure increased sharply and the urbanization process accelerated. At this time, the construction industry also ushered in prosperity. Prosperous spring. However, a series of problems caused by the demolition of a large number of old buildings are also becoming more and more obvious. The construction waste generated has accounted for 30%-40% of the total urban waste. According to comprehensive statistics, the total amount of waste concrete is at least 100 million tons, and with the further...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B18/16
CPCY02W30/91
Inventor 谢立辉张向超胡世平肖婧林涛
Owner CHANGSHA UNIVERSITY