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Composite clay substituting natural sand and premixed concrete adopting composite clay as raw material

A technology of ready-mixed concrete and natural sand, applied in the field of ready-mixed concrete, which can solve problems such as lowering the use value and air quality pollution, and achieve high strength, improved corrosion resistance and durability, great market promotion value and application prospects Effect

Inactive Publication Date: 2014-10-01
广西经正科技开发有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country is rich in rice resources, and the simple treatment of rice husks not only reduces its use value, but also causes air pollution when burned

Method used

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  • Composite clay substituting natural sand and premixed concrete adopting composite clay as raw material
  • Composite clay substituting natural sand and premixed concrete adopting composite clay as raw material
  • Composite clay substituting natural sand and premixed concrete adopting composite clay as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The rice husk was washed and dried with water and reacted with hydrochloric acid with pH=1, then dried, calcined and ground to obtain rice husk ash, wherein the calcining temperature was 500°C.

[0034] The shell powder is recovered and cleaned from discarded shells, washed with 10% by mass NaOH alkali for 0.5-24 hours, dried and ground to obtain the shell powder.

[0035] Mix clay, shell powder, fly ash, slag, rice husk ash, quicklime, and sodium carbonate with water in proportion. After ball milling, use a roller compactor to compact the mixed powder. Drying, granulation, sieving and grading to obtain composite clay, the specific formulation is shown in Table 1.

[0036]

Embodiment 2

[0038] Samples of the composite clay prepared in Example 1 were prepared respectively, and the standards of "Sand for Construction" (GB / T14684-2011) and "Quality and Inspection Standards for Sand and Stone for Ordinary Concrete" (JGJ 52) were used to compare the samples. The indicators were tested and the results are shown in Table 2.

[0039]

[0040] As can be seen from the test results in Table 2, the composite clay sand grains of the present invention meet the requirements of the standards of "Sand for Construction" (GB / T14684-2011) and "Sand and Stone Quality and Inspection Standards for Ordinary Concrete" (JGJ 52); The unique microstructure of rice husk ash and shell powder makes the bulk density and apparent density relatively high.

Embodiment 3

[0042] In order to verify the performance of ready-mixed concrete using composite clay, shell powder, and rice husk ash as raw materials, we conducted a component substitution verification test with the same ratio and tested related indicators.

[0043] According to the components and proportions in Table 3, the ready-mixed concrete is mixed at room temperature, and its slump and compressive strength are tested in accordance with "Concrete Admixtures" (GB8076-2006) and "Experimental Methods for Mechanical Properties of Ordinary Concrete". "Standard" (GB / T50081-2002) requires testing, and the specific test results are shown in Table 3.

[0044] The fine aggregate in the blank example in table 3 is natural medium sand, and the mineral powder is the fly ash of class F of class II; the fine aggregate in the test example is numbered 1, 3, 5, The composite clay of 7, the mineral powder is the mineral powder in the present invention, and the mass percentage of the mineral powder of t...

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Abstract

The invention belongs to the field of a building material, and discloses composite clay substituting the natural sand and premixed concrete adopting the composite clay as a raw material. The composite clay comprises the following raw materials by weight percent: 45 to 75 percent of clay, 3 to 10 percent of shell powder, 5 to 20 percent of coal ash, 5 to 20 percent of slag, 5 to 20 percent of rice hull ash, 0.5 to 2 percent of quick lime and 0.5 to 1.5 percent of sodium carbonate. All components are added into water to be premixed, stirred, ground and rolled, and the obtained mixture is dried, granulated, screened and graded at the temperature of 200 to 300 DEG C to obtain a raw material for stirring the concrete. The composite clay is composited with cement, stones, mineral powder, a water reducing agent and water according to a given ratio to obtain the premixed concrete with excellent slump and tensile strength. The composite clay is adopted to substitute the natural sand to be used as fine aggregates in the premixed concrete, so that the corrosion resistance and durability of the concrete can be improved; moreover, the resources such as rice shell and shells are adequately utilized, the waste is converted into treasure, the market popularization value is high, and the application prospect is wide.

Description

technical field [0001] The invention belongs to the field of building materials, and specifically relates to a composite clay replacing natural sand and ready-mixed concrete using it as a raw material, especially suitable for ordinary concrete, high-performance concrete, ultra-high-strength concrete, fiber concrete, active powder concrete, etc. Production. Background technique [0002] The main building material used in structures in my country is concrete, and natural sand is its main fine skeleton. At present, natural sand is used in most areas. Natural sand belongs to local resources and cannot be regenerated in a short period of time. With the increase of construction volume, the natural sand in many areas of our country is almost exhausted. At the same time, because the over-exploitation of natural river sand will cause damage to the ecological environment, many places have strictly prohibited or restricted the mining of natural river sand, which has led to the supply a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/30C04B28/00
CPCY02W30/91
Inventor 黄映恒韦菲侯蕾李菲萍李燕罗春林廖森
Owner 广西经正科技开发有限责任公司
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