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Concrete containing low-quality coarse aggregate and preparation thereof

A kind of technology of concrete and coarse aggregate

Active Publication Date: 2009-04-22
NANJING HYDRAULIC RES INST THE MINISTRY OF WATER RESOURCES THE MINIST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually low-quality coarse aggregate is used to prepare concrete, which will lead to poor concrete durability

Method used

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  • Concrete containing low-quality coarse aggregate and preparation thereof
  • Concrete containing low-quality coarse aggregate and preparation thereof
  • Concrete containing low-quality coarse aggregate and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Concrete prepared with low-quality coarse aggregate from a certain production area requires design compressive strength grade C30, impermeability W6, 28d carbonation depth ≤ 5mm, and frost resistance F100. Use the existing preparation technology to add 4-6kg / m2 to the low-quality coarse aggregate concrete 3 Naphthalene water reducer and 0.04~0.08kg / m 3 Rosin thermal polymer air-entraining agent, the concrete compressive strength can meet the design requirements, but the durability can not meet (impermeability lower than W6, 28d carbonation depth> 5mm, frost resistance can only reach F50). The invention adds ultra-fine fly ash, polycarboxylate water reducing agent, sodium lauryl sulfate air-entraining agent and high-aged soil material into low-quality coarse aggregate concrete to prepare high-durability concrete. The preparation method is as follows:

[0019] (1) 282~309kg / m 3 Cement, 0~121kg / m 3 Superfine fly ash, 60~80kg / m 3 Put the water into the self-falling mix...

Embodiment 2

[0029] Concrete is prepared with low-quality coarse aggregate from a certain production area, and the design compressive strength grade C30, impermeability W8, 28d carbonation depth 5mm, and frost resistance F150 are required. Use the existing preparation technology to add 4-6kg / m2 to the low-quality coarse aggregate concrete 3 Naphthalene water reducer and 0.04~0.08kg / m 3 Rosin thermal polymer air-entraining agent, the concrete compressive strength can meet the design requirements, but the durability can not meet (impermeability lower than W6, 28d carbonation depth> 5mm, frost resistance can only reach F100). The invention adds ultra-fine fly ash, polycarboxylate water reducer, sodium lauryl sulfate air-entraining agent, older soil material and superabsorbent resin particles into low-quality coarse aggregate concrete to prepare high-durability concrete. The preparation method is as follows:

[0030] (1) 282~309kg / m 3 Cement, 0~121kg / m 3 Superfine fly ash, 60~80kg / m 3 Put...

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Abstract

The invention relates to a concrete containing low-quality coarse aggregates, which is prepared from water, cement, superfine fly ash, sand, gravel stone, medium stone, and admixture according to certain weight proportion. A method for preparing the concrete comprises the following steps: firstly, putting the water, the cement and the superfine fly ash into a stirring apparatus for stirring; secondly, adding the sand, the gravel stone and the medium stone into the stirring apparatus for stirring; and thirdly, adding the admixture into the mixture and stirring the mixture continuously, filling the mixture into a mold, and maintaining the mold to obtain the concrete with high durability. Compared with the concrete containing the low-quality coarse aggregates prepared by the prior method, the concrete prepared by the method has the advantages of better mechanical performance, impermeability, carbonizing resistance, and frost resistance, thus the durability of the concrete is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of hydraulic building materials, and in particular relates to concrete containing low-quality coarse aggregate and a preparation method thereof. Background technique [0002] With the rapid development of the construction industry, the demand for coarse aggregate continues to grow, and the high-quality natural coarse aggregate in nature is continuously mined, and the problem of resource depletion is becoming increasingly prominent. Low-quality coarse aggregate refers to coarse aggregate whose physical and mechanical properties are lower than the requirements of relevant specifications and generally cannot be used in engineering. my country's "Code for Construction of Hydraulic Concrete" (DL / T5144-2001) requires the quality of coarse aggregate: mud content (D 20 、D 40 Grade) ≤ 1%, apparent density ≥ 2550kg / m 3 , Water absorption ≤ 2.5%. Generally, low-quality coarse aggregate is used to prepare concrete, ...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B18/08C04B14/06C04B14/02
CPCC04B2111/29C04B2111/20C04B28/02Y02W30/91C04B14/02C04B14/06C04B14/106C04B18/08C04B20/0092C04B20/0096C04B22/064C04B22/143C04B24/16C04B24/24C04B24/2641C04B40/0028C04B2103/302C04B2103/304
Inventor 胡智农岳修斌陆采荣梅国兴白传贞鲍学高陈建国
Owner NANJING HYDRAULIC RES INST THE MINISTRY OF WATER RESOURCES THE MINIST
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