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Antifreeze-thaw cycle recycled concrete and preparation method thereof

A recycled concrete technology, applied in the field of building materials, can solve the problems of poor freeze-thaw resistance, restricted development and application, and low apparent density of recycled concrete, so as to improve freeze-thaw resistance, promote hydration, Effect of reducing water absorption

Active Publication Date: 2022-05-17
崇德建材集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with artificial sand aggregate, recycled aggregate has residual slurry attached to its surface, which has the characteristics of high water absorption and low apparent density, and has a higher water content. Therefore, the recycled aggregate prepared from recycled The free water inside the concrete is easy to crystallize and expand under the low temperature environment, resulting in a large expansion pressure inside the recycled concrete specimen, resulting in cracks. After the specimen is subjected to repeated freeze-thaw cycles, the surface of the recycled concrete will appear cracking, peeling, falling off, etc. , the freeze-thaw resistance of recycled concrete is not good, which seriously restricts its development and application in the construction industry

Method used

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  • Antifreeze-thaw cycle recycled concrete and preparation method thereof
  • Antifreeze-thaw cycle recycled concrete and preparation method thereof
  • Antifreeze-thaw cycle recycled concrete and preparation method thereof

Examples

Experimental program
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Effect test

preparation example 1

[0039] A silicone resin modified regenerated coarse aggregate and a silicone resin modified regenerated fine aggregate are prepared according to the following steps:

[0040] Put the waste cement blocks into the crusher and crush them to aggregates with a maximum particle size of no more than 31.5mm, and put the aggregates into the 5X series gravel shaping machine to produce machine-made sand equipment. The speed is 100m / s, and the shaped recycled aggregate particles are rolled and screened once, screened twice, and the recycled aggregates with a particle size of 3-25mm are screened out, and the recycled aggregates are put into water and soaked for 48 hours. Take out the recycled aggregate and dry it in the sun;

[0041] Weigh 1kg of silane coupling agent KH-550 and 99kg of water, stir and blend, configure a silicone resin emulsion with a concentration of 1wt%, add 100kg of silicone resin emulsion to 200kg of recycled aggregate, and stir at a speed of 600rpm After mixing and ...

preparation example 2-3

[0043] A silicone resin-modified regenerated coarse aggregate and a silicone resin-modified regenerated fine aggregate differ from Preparation Example 1 in that the concentration of the silicone resin emulsion is different, and the specific concentrations are shown in Table 2 below.

[0044] Preparation example Silane coupling agent KH-550 / kg water / kg Silicone resin emulsion concentration / wt% Preparation Example 1 1 99 1 Preparation example 2 4 96 4 Preparation example 3 2 98 2

Embodiment 1

[0046] Embodiments 1-7 all provide a freeze-thaw cycle-resistant recycled concrete, which will be described below by taking Embodiment 1 as an example.

[0047]A kind of anti-freeze-thaw cycle recycled concrete provided in embodiment 1, its preparation steps are:

[0048] Take by weighing 24kg Portland cement, 73kg by the organosilicon resin modified regeneration fine aggregate that preparation example 3 makes, 90kg by the organosilicon resin modification regeneration coarse aggregate that preparation example 3 makes, 13.2kg water, 3kg poly Carboxylate superplasticizer LA-8Q, 0.12kg fatty alcohol polyoxyethylene ether AEO-7 and 0.5kg rubber powder RA-789A (mesh 20-60 mesh);

[0049] Put Portland cement, organosilicon resin modified regenerated fine aggregate, organosilicon resin modified regenerated coarse aggregate, polycarboxylate superplasticizer and rubber powder into the mixer, and stir and blend at a speed of 600rpm for 5min. After the stirring is completed, water and f...

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Abstract

The invention discloses a freezing-thawing cycle recycled concrete and a preparation method thereof. A kind of anti-freezing and thawing recycled concrete, which is prepared from the following raw materials: Portland cement, fine aggregate, coarse aggregate, water, water reducing agent, air-entraining agent, rubber powder, and the fine aggregate includes organic Silicone resin modified recycled fine aggregate, the coarse aggregate includes organosilicon resin modified recycled coarse aggregate; in this application, rubber powder and air-entraining agent provide expansion space for the expansion of free water in recycled concrete, reducing the internal At the same time, silicone resin is used to coat the surface of recycled aggregates to reduce the water absorption of recycled aggregates, improve the freeze-thaw resistance of recycled concrete, and the modified recycled aggregates are closely connected with the cement gel system , making the interior of the recycled concrete dense, and enhancing the compressive strength of the recycled concrete.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a freeze-thaw-resistant recycled concrete and a preparation method thereof. Background technique [0002] The development of the construction industry is often accompanied by the generation of a large amount of construction waste. Construction waste mainly refers to a large number of waste cement blocks produced during the demolition of abandoned buildings. Since the cement blocks contain a large amount of calcium oxide and other components, long-term contact with the soil will change the acidity and alkalinity of the soil, thereby changing the soil properties. , so the waste cement blocks cannot be buried on the spot, and it is difficult to process them. [0003] At present, the construction industry is gradually trying to recycle waste cement blocks: the waste cement blocks are broken into recycled aggregates of different particle sizes, and the recycled aggregates ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B20/10C04B18/22C04B16/04C04B18/16C04B24/32C04B28/26
CPCC04B28/04C04B20/1051C04B18/22C04B16/04C04B18/16C04B24/32C04B28/26C04B2201/50C04B2103/302Y02W30/91
Inventor 章碧业戴剑海
Owner 崇德建材集团有限公司
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