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High-performance anti-crack concrete and preparation process thereof

A preparation process and concrete technology, which is applied in the field of concrete, can solve problems such as cracking and affecting the service life of reinforced concrete, and achieve excellent crack resistance

Inactive Publication Date: 2022-03-01
南京广兰建材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Concrete is used in conjunction with steel bars in practical applications, and cracks often occur after the reinforced concrete sets and hardens, which affects the service life of the reinforced concrete

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] This example discloses a high-performance crack-resistant concrete, which includes 30-50 parts of cement, 60-90 parts of coarse aggregate, 30-50 parts of fine aggregate, 20-40 parts of water, 3-5 parts of water reducing agent, Anti-crack agent 10-15 parts.

[0018] In this embodiment, the anti-cracking agent includes 5-10 parts of nano-alumina, 5-8 parts of fly ash, 3-5 parts of hemihydrate gypsum, and 3-6 parts of dihydrate gypsum.

[0019] This embodiment also discloses a preparation process of high-performance crack-resistant concrete, comprising the following steps:

[0020] Step 1: Take 5-10 parts of nano-alumina, 5-8 parts of fly ash, 3-5 parts of hemihydrate gypsum, and 3-6 parts of dihydrate gypsum according to the number of parts by mass, pulverize them into powder in a ball mill, and mix them evenly to make anti-cracking agent;

[0021] Step 2: Take 60-90 parts of coarse aggregate and 30-50 parts of fine aggregate according to the parts by mass, wash and dry...

Embodiment 2

[0029] In this example, 40 parts of cement, 75 parts of coarse aggregate, 40 parts of fine aggregate, 30 parts of water, 4 parts of water reducing agent, 12 parts of anti-cracking agent, 8 parts of nano-alumina, 6 parts of fly ash, half 4 parts of water gypsum, 5 parts of dihydrate gypsum.

Embodiment 3

[0031] In this example, 50 parts of cement, 90 parts of coarse aggregate, 50 parts of fine aggregate, 40 parts of water, 5 parts of water reducing agent, and 15 parts of anti-cracking agent. 10 parts of nano-alumina, 8 parts of fly ash, 5 parts of hemihydrate gypsum, 6 parts of dihydrate gypsum

[0032] Compared with ordinary concrete without anti-cracking agent, the performance comparison experiment is carried out, and the data are shown in the following table:

[0033] sample Compressive strength (MPa) Splitting tensile strength (MPa) ordinary concrete 26.9 2.36 Example 1 36.6 3.65 Example 2 38.4 4.56 Example 3 34.3 3.26

[0034] It can be seen from the table that the crack resistance of the concrete added with the anti-crack agent of this embodiment is significantly improved.

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Abstract

The invention discloses high-performance anti-cracking concrete, which is prepared from 30 to 50 parts of cement, 60 to 90 parts of coarse aggregate, 30 to 50 parts of fine aggregate, 20 to 40 parts of water, 3 to 5 parts of water reducing agent and 10 to 15 parts of anti-cracking agent. The anti-cracking agent is prepared from 5 to 10 parts of nano aluminum oxide, 5 to 8 parts of fly ash, 3 to 5 parts of semi-hydrated gypsum and 3 to 6 parts of dihydrate gypsum. The invention also discloses a preparation process of the high-performance anti-crack concrete, which comprises the following steps: step 1, taking 5-10 parts by mass of nano aluminum oxide, 5-8 parts by mass of fly ash, 3-5 parts by mass of semi-hydrated gypsum and 3-6 parts by mass of dihydrate gypsum, crushing into powder in a ball mill, and uniformly mixing to obtain an anti-crack agent; step 2, taking 60-90 parts by mass of coarse aggregate and 30-50 parts by mass of fine aggregate, cleaning and drying; 3, 30-50 parts of cement, 20-40 parts of water, the coarse aggregate and the fine aggregate are put into a stirring machine to be stirred; and 4, adding the anti-cracking agent and the water reducing agent prepared in the step 1 into a stirrer, and stirring to prepare the finished product concrete.

Description

technical field [0001] The invention relates to the field of concrete, in particular to a high-performance crack-resistant concrete and a preparation process thereof. Background technique [0002] Concrete, referred to as "concrete (tóng)": refers to the general designation of engineering composite materials in which aggregates are cemented into a whole by cementitious materials. Generally speaking, the term concrete refers to the cement concrete obtained by using cement as the cementitious material, sand and stone as the aggregate; mixed with water (may contain admixtures and admixtures) in a certain proportion, and stirred. Concrete, which is widely used in civil engineering. [0003] Concrete is used in conjunction with steel bars in practical applications, and cracks often occur after the reinforced concrete sets and hardens, which affects the service life of the reinforced concrete. Contents of the invention [0004] Purpose of the invention: The technical problem t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2111/343C04B2201/50C04B14/02C04B18/08C04B22/06C04B22/143C04B2103/302
Inventor 袁智张佐贵张超
Owner 南京广兰建材科技有限公司