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Low-strength low-permeability concrete and preparation method thereof

A concrete and low water permeability technology, applied in the field of building materials, can solve the problems of large internal porosity and good water permeability, and achieve the effects of low water permeability, high core-pulling continuity and less pile bottom sediment.

Active Publication Date: 2020-12-11
中建四局建设发展有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conventional low-strength concrete has large internal porosity and good water permeability, so it is not suitable for water-stop piles

Method used

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  • Low-strength low-permeability concrete and preparation method thereof
  • Low-strength low-permeability concrete and preparation method thereof
  • Low-strength low-permeability concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0040] The present invention also provides a preparation method of low-strength and low-permeability concrete, comprising the steps of:

[0041] S1: Try mixing 40-60 liters of concrete, and determine the amount of each component according to the mass ratio of the components of each cubic concrete mixture;

[0042] S2: In order to fully and evenly mix the various components during mixing, before mixing, beat the large piece of clay into a block with a particle size of less than 50mm, take out 15-20% of the water to wet the inner wall of the mixer, and weigh the Put the good clay and sand into the mixer and stir for 30-40 seconds; the inner wall of the mixer should be wetted with water first, so that it is not easy to make the mixture stick to the inner wall when adding the mixture later, first pour the clay and sand into the mixer, and stir Evenly, then add cement and fly ash, then add 50-60% of water, and stir for 40-60s; at this time, no water-reducing agent has been added, a...

Embodiment 1

[0047] The present embodiment provides a kind of low-strength low-permeability concrete, and its preparation method is as follows:

[0048] S1: Trial mix 60 liters of concrete, weigh each component cement: fly ash: clay: sand: water: water reducer;

[0049] S2: Beat a large piece of clay into a block with a particle size of less than 50mm, take out 15-20% of water to wet the inner wall of the mixer, add the weighed clay and sand into the mixer, and stir for 30-40s; add cement and pulverized coal ash, then add 50-60% of water, stir for 40-60s; then add water reducing agent and the remaining water, stir for 120-150s;

[0050] S3: Take out part of the mixture and put it into a slump bucket to measure the slump; if the slump is between 100 and 150mm, take out the mixture for mold-fitting curing, and maintain it under standard curing conditions for 28 days and measure the mold-fitting The compressive strength of the test block is qualified.

[0051] According to the weight ratio ...

Embodiment 2

[0076] Present embodiment provides a kind of low-strength and low-permeability concrete, and the weight of every cubic meter of concrete is as table 5:

[0077] Table 5. Concrete mix ratio used in embodiment 2

[0078]

[0079] Other operations are the same as in Example 1.

[0080] Among them, the cement is 32.5 slag Portland cement; the fly ash is Class F first-class fly ash; the sand is medium sand; the water reducer is a polycarboxylate high-performance water reducer with a water reducing rate of not less than 30%. ; The clay is clay with a plasticity index > 17; tap water is used for water.

[0081] In this implementation, the amount of cement and sand was reduced, and the amount of fly ash and clay was increased. By adjusting the amount of each mixture, the concrete prepared by the mix ratio in this example was applied to the water-stop pile. Through the drilling and coring test of the water-stop pile, it was found that the coring effect was good, the coring continuit...

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Abstract

The embodiment of the invention provides low-strength low-permeability concrete and a preparation method thereof. A concrete mixture of the low-strength low-permeability concrete comprises cement, flyash, clay, sand, water and a water reducing agent. Wherein the mass ratio of the cement to the fly ash to the clay to the sand to the water to the water reducing agent in each cubic meter of the concrete mixture is (82.9-117): (175.6-210.7): (1118-1235.2): (527-643.9): (320-330): (17-18), and the total mass of each cubic meter of the concrete mixture is 2300-2400 kg. The low-strength low-permeability concrete provided by the invention has good concrete workability, is convenient to construct, has good impermeability and is suitable for underground engineering; materials are convenient to obtain, and the economy is good.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a method for preparing low-strength and low-permeability concrete. Background technique [0002] Concrete is a common and most common building material in construction engineering. The strength grade of concrete commonly used in foundation structures in engineering is C15-C30, and the strength grade of concrete commonly used in main structures is C40-C60, and has been developing towards higher strength, even There are many concretes with strength grades from C80 to C100 that have been widely used in engineering. The cementitious material of concrete is mainly cement. Generally speaking, the more cement is used, the higher the strength level of concrete. The lower the strength grade of cement, the lower the strength of concrete when the amount of cement is less. However, the greater the amount of cement, the worse the plasticity of concrete, thanks to the application of high-ef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/08E02D17/04E02D5/18C04B111/27
CPCC04B28/08E02D17/04E02D5/18C04B2111/27C04B2201/50C04B18/08C04B14/10C04B14/06C04B2103/302Y02W30/91
Inventor 李军心黄华陈国宝曾平王金兵祝国梁蔡玉长生王成龙陈明法
Owner 中建四局建设发展有限公司
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