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Recycled aggregate concrete and preparation method thereof

A recycled aggregate and concrete technology, applied in the field of building materials, can solve problems such as easy cracks on the surface, seepage erosion, poor durability of marine engineering components, etc.

Inactive Publication Date: 2021-05-18
深圳市宝金华混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In coastal areas, because the ocean engineering components are farther from the surface and are affected by the tides every day, the ocean engineering components will be scoured for a long time, and due to the excessive exploitation of groundwater in the city, the phenomenon of seawater intrusion is becoming more and more serious. Ocean engineering components The seepage scour effect continues unabated, so that marine engineering components will not only be eroded by corrosive ions in seawater, but also seepage scour by seawater, resulting in poor durability of marine engineering components
[0005] In view of the above-mentioned related technologies, the inventor believes that when recycled aggregate concrete is used to prepare marine engineering components, it is susceptible to seepage erosion, cracks are prone to occur on the surface, and the durability is poor

Method used

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

Examples

Experimental program
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Effect test

preparation example 1-6

[0037] In the preparation example 1-6, the aramid resin is selected from Shandong Jufang New Material Co., Ltd., the model is U200; the water glass is selected from Hubei Zhenghe Technology Co., Ltd., the model is S-1430B; the nano-calcium carbonate is selected from Lingshou County Aotai Mineral Products Processing Plant, the model is AT797; the silica fume is from Lingshou County Yunda Mineral Products Co., Ltd., the product number is 06; the volcanic ash is from Lingshou County Huachen Mineral Products Trading Co., Ltd., the product number is 88.

preparation example 1

[0038] Preparation Example 1: (1) Grind 10kg of construction waste to below 40mm, add water to 5kg of water glass and 3kg of nano calcium carbonate, mix well, soak for 24h under a negative pressure of 0.02MPa, the amount of water added is water glass and nano calcium carbonate 10 times the total amount of calcium carbonate, the construction waste gradation is 5-25mm continuous gradation, the needle flake particle content is 5%, the crushing index is 14%, and the bulk density is 1350kg / m 3 , water content is 1.6%, and 24h water absorption rate is 9%, and construction waste is made through removing steel bar, crushing by the waste and old concrete blocks that road reconstruction demolishes; (2) in step (1) gained construction waste, add 4kg silica fume, 5kg Volcanic ash and water, after stirring evenly, stir for 40min under a negative pressure of 0.1MPa, filter, the amount of water added is 3 times the weight of construction waste, and dry to constant weight. The average particle...

preparation example 2

[0039] Preparation example 2: (1) crush 15kg of construction waste to less than 40mm, add water to 8kg of water glass and 5kg of nanometer calcium carbonate, mix well, soak for 22h under a negative pressure of 0.05MPa, the amount of water added is waterglass and nanometer calcium carbonate 15 times the total amount of calcium carbonate, the construction waste gradation is 5-25mm continuous gradation, the needle flake particle content is 6%, the crushing index is 15%, and the bulk density is 1380kg / m 3 , moisture content is 1.7%, and 24h water absorption rate is 9.5%, and construction waste is obtained through removing steel bar, crushing by the waste concrete block that road reconstruction demolishes; (2) in step (1) gained construction waste, add 6kg silica fume, 8kg After the volcanic ash and water are evenly stirred, they are stirred for 35 minutes under a negative pressure of 0.13MPa, filtered, and the amount of water added is 4 times the weight of construction waste, and d...

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Abstract

The invention relates to the field of building materials, and particularly discloses recycled aggregate concrete and a preparation method thereof. The recycled aggregate concrete is prepared from the following components in parts by weight: 300 to 340 parts of cement, 150 to 160 parts of water, 85 to 100 parts of fly ash, 65 to 85 parts of mineral powder, 600 to 650 parts of sand, 960 to 1000 parts of stones, 8 to 10 parts of a water reducing agent, 10 to 13 parts of a preservative and 320 to 360 parts of recycled aggregate, the preparation method comprises the following steps: S1, uniformly mixing the cement, the water, the fly ash and the mineral powder to obtain a premixed mixture; and S2, adding the recycled aggregate, the stones, the sand, the water reducing agent and the preservative into the premixed mixture, and uniformly mixing. The recycled aggregate concrete disclosed by the invention has the advantages of strong scouring resistance, good chloride ion corrosion resistance and excellent durability when being used for ocean engineering construction.

Description

technical field [0001] The application relates to the field of building materials, more specifically, it relates to a recycled aggregate concrete and a preparation method thereof. Background technique [0002] With the rapid development of my country's economy and the advancement of urbanization in various places, a large number of concrete buildings have been demolished due to their service life, or have been rebuilt and expanded due to municipal construction needs, resulting in a large amount of construction waste. The current construction waste treatment Most of them are open-air or landfilled. At the same time, with the rapid development of my country's marine economy, the marine transportation industry has developed rapidly. The new construction and expansion of many coastal port buildings require a huge number of concrete components. [0003] The hard inorganic components that exist in large quantities in construction waste are processed into recycled aggregates through...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B20/10C04B18/02C04B111/20C04B111/24
CPCC04B28/04C04B18/021C04B20/1037C04B2201/20C04B2201/50C04B2111/2015C04B2111/20C04B2111/00293C04B2111/24
Inventor 钟晓升钟晓东
Owner 深圳市宝金华混凝土有限公司
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