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Recycled concrete and preparation method thereof

A technology of recycled concrete and recycled coarse aggregate, applied in the field of concrete, can solve the problems of unfavorable construction, poor fluidity, high water absorption rate of recycled aggregate, etc., and achieve the effects of convenient construction, improved fluidity and slump

Active Publication Date: 2020-07-17
西安顺通建材有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The slump of the concrete mixture prepared by the above technical scheme is low, because the waste concrete is subjected to a large external force during the crushing process, and a large number of fine cracks are prone to appear inside the aggregate, and the water absorption rate of the recycled aggregate is higher than that of the natural aggregate. Large, many pores, high surface roughness, and large amount of slurry, resulting in small slump, poor fluidity, unfavorable for construction, not easy to vibrate and compact, and the formed concrete is prone to voids and honeycombs

Method used

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  • Recycled concrete and preparation method thereof
  • Recycled concrete and preparation method thereof
  • Recycled concrete and preparation method thereof

Examples

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Effect test

Embodiment 1

[0045] Embodiment 1: a kind of recycled concrete, each component of its raw material and corresponding parts by weight thereof are as shown in table 1,

[0046] The glaze modified recycled coarse aggregate is prepared through the following steps:

[0047] Step 1, crushing the waste concrete into coarse aggregates of 5-25 mm in size, washing the broken coarse aggregates with water, and drying them naturally to obtain regenerated coarse aggregates;

[0048] Step 2, prepare the glaze, put 5±1 parts of feldspar, 5±1 parts of quartz, 5±1 parts of calcite, 17±1 parts of kaolin, and 4±1 parts of alumina Grind in a ball mill for 20±0.5 hours, mix the ground raw materials evenly to obtain glaze;

[0049] Step 3, put the regenerated coarse aggregate into the mixing tank, add water to the glaze and stir evenly to obtain a glaze slurry, the parts by weight of the glaze, surfactant and water are 30 parts and 60 parts respectively, and add the glaze into the mixing tank Slurry until the r...

Embodiment 2-3

[0055] Embodiment 2-3: A kind of recycled concrete, the difference from Example 1 is that the components of its raw materials and their corresponding parts by weight are shown in Table 1, and the raw materials of the glaze slurry and their corresponding parts by weight The number is shown in Table 2, and the unit in Table 1 is kg / m 3 It is the unit of parts by weight of the raw materials required for the recycled concrete of the present invention.

[0056] Each raw material of recycled concrete and parts by weight thereof in table 1 embodiment 1-3

[0057]

[0058] Each raw material and parts by weight of glaze slurry in table 2 embodiment 1-3

[0059] components Example 1 Example 2 Example 3 glaze 30 40 38 water 60 55 55

Embodiment 4

[0060] Embodiment 4: A kind of recycled concrete, the difference from Example 1 is that in the step 3 of preparing the glaze modified recycled coarse aggregate, water and surfactant are added to the glaze, and the glaze slurry is obtained by stirring evenly. The parts by weight of surfactant is 18 parts. In this embodiment, the surfactant is sodium dodecylbenzenesulfonate.

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Abstract

The invention discloses recycled concrete and a preparation method thereof, and relates to the technical field of concrete. The technical key points are as follows: the raw materials comprise the following components in parts by weight: 280-300 kg / m < 3 > of cement; 70-90 kg / m < 3 > of fly ash; 800 to 820 kg / m < 3 > of sand; 790 to 810 kg / m < 3 > of glaze modified recycled coarse aggregate; 190-210 kg / m < 3 > of natural gravel; 8-10 kg / m < 3 > of an additive; and 155-165k kg / m < 3 > of water. The recycled concrete provided by the invention has the advantage of improving the slump and mechanical strength of recycled concrete.

Description

technical field [0001] The invention relates to the technical field of concrete, more specifically, it relates to a recycled concrete and a preparation method thereof. Background technique [0002] Our country is in a period of rapid economic development. With the development of our country's economy, population growth, and urbanization of towns, the basic construction is also at a climax of development. The centralized planning of second-tier and lower cities has led to the demolition of a large number of existing buildings. The disposal of the resulting construction waste also puts a huge pressure on the environment, among which waste concrete accounts for 30%-40% of the construction waste; on the other hand, the demand for sand and gravel aggregates in Daxing construction is increasing , due to a large amount of mining, it has caused great damage to the natural environment, and the natural resources are gradually becoming exhausted. Demolition or new construction, constr...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B20/10C03C8/00
CPCC04B28/04C04B20/1074C03C8/00C04B2201/50C04B18/08C04B14/06C04B18/16C04B14/02C04B2103/302C04B20/068
Inventor 刘俊涛
Owner 西安顺通建材有限责任公司
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