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Concrete containing modified cassava starch-polycarboxylic acid composite water reducing agent

A composite water reducing agent, tapioca starch technology, applied in the field of building materials, can solve problems such as toxicity, discharge of highly toxic waste liquid, affecting appearance and performance, etc.

Inactive Publication Date: 2020-07-07
NANNING TONGCAI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to propose a kind of concrete containing modified tapioca starch-polycarboxylic acid composite water reducing agent, to solve the defects of the existing concrete in the prior art due to the formula and the manufacturing process, there are generally small trachoma and pores, Issues affecting its appearance and performance
It can also solve the technical problems that the existing water reducer products are toxic, non-biodegradable, and discharge a large amount of toxic waste liquid during the production process, making it difficult to meet the requirements of green and environmental protection.

Method used

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  • Concrete containing modified cassava starch-polycarboxylic acid composite water reducing agent

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preparation example Construction

[0028] The preparation method of described concrete, comprises the following steps:

[0029] S1: Add general-purpose Portland cement, fly ash, 75 parts of water, sodium carboxymethyl cellulose, sand and stones into a mixer and stir for 15 minutes to obtain a mixed solution A;

[0030] S2: Add the modified tapioca starch-polycarboxylate superplasticizer to the mixed solution A, stir for 5 minutes, and let it stand for 15 minutes to obtain the mixed solution B;

[0031] S3: Add ferrous sulfate to the mixture B, stir with a mixer for 4 minutes, and put it into the corresponding template.

[0032] The modified tapioca starch-polycarboxylic acid composite water reducer includes the following raw materials in parts by weight: 20-35 parts of modified tapioca starch, 30-120 parts of sodium hydroxide, 2-6 parts of retarder, 0.5-4 parts of defoamer, 1-5.5 parts of air-entraining agent.

[0033] The retarder includes the following raw materials in parts by weight: 43-60 parts of sodium...

Embodiment 1

[0037] The concrete of the modified tapioca starch-polycarboxylic acid composite superplasticizer includes the following raw materials in parts by weight: 45 parts of general-purpose Portland cement, 90 parts of sand, 157.5 parts of stones, 27 parts of fly ash, 7 parts of sodium carboxymethyl cellulose, 0.6 parts of modified tapioca starch-polycarboxylate superplasticizer, and 0.4 parts of ferrous sulfate.

[0038] The preparation method of described concrete, comprises the following steps:

[0039] S1: Add general-purpose Portland cement, fly ash, 75 parts of water, sodium carboxymethyl cellulose, sand and stones into a mixer and stir for 15 minutes to obtain a mixed solution A;

[0040] S2: Add the modified tapioca starch-polycarboxylate superplasticizer to the mixed solution A, stir for 5 minutes, and let it stand for 15 minutes to obtain the mixed solution B;

[0041] S3: Add ferrous sulfate to the mixed solution B, stir with a mixer for 4 minutes, and put it into the cor...

Embodiment 2

[0047] The concrete of the modified tapioca starch-polycarboxylic acid composite superplasticizer includes the following raw materials in parts by weight: 65 parts of general-purpose Portland cement, 130 parts of sand, 227.5 parts of stones, 12 parts of fly ash, 9 parts of sodium carboxymethyl cellulose, 1 part of modified tapioca starch-polycarboxylate superplasticizer, and 1 part of ferrous sulfate.

[0048] The preparation method of described concrete, comprises the following steps:

[0049] S1: Add general-purpose Portland cement, fly ash, 75 parts of water, sodium carboxymethyl cellulose, sand and stones into a mixer and stir for 15 minutes to obtain a mixed solution A;

[0050] S2: Add the modified tapioca starch-polycarboxylate superplasticizer to the mixed solution A, stir for 5 minutes, and let it stand for 15 minutes to obtain the mixed solution B;

[0051] S3: Add ferrous sulfate to the mixed solution B, stir with a mixer for 4 minutes, and put it into the correspo...

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Abstract

The invention discloses concrete containing a modified cassava starch-polycarboxylic acid composite water reducing agent, and belongs to the field of building materials. The concrete containing the modified cassava starch-polycarboxylic acid composite water reducing agent is prepared from the following raw materials in parts by weight: 30 to 65 parts of general purpose Portland cement, 60 to 130 parts of sand, 105 to 227.5 parts of stone, 12 to 40 parts of fly ash, 5 to 9 parts of sodium carboxymethyl cellulose, 0.5 to 1 part of modified cassava starch-polycarboxylate superplasticizer and 0.1to 1 part of ferrous sulfate. The composite water reducing agent is prepared through the reaction processes of oxidation, acidification, etherification, grafting, neutralization and the like. The concrete product of the invention is smooth in appearance and good in durability, sand holes and air holes are not formed in the surface of the concrete product, and high compressive strength is achieved;when the mixing amount of the composite water reducing agent is 0.3%, the coagulation time is longer than 24 hours, and the requirements of the super retarder are met.

Description

technical field [0001] The invention relates to the field of building materials, in particular to concrete containing modified tapioca starch-polycarboxylic acid composite water reducing agent. Background technique [0002] Due to the defects in the formula and production process of traditional concrete, there are generally small pores and trachoma, which affect its appearance and also affect its use function. Depression occurs, if the amount of spray paint is increased, it will not only affect the appearance, but also the drying time of the paint will be different, which will affect the progress of the project. The board with air bubbles has poor water absorption performance, the surface of the board is easy to crack, poor durability, frost resistance, impermeability ability is greatly reduced. Therefore, reasonable selection of process flow, optimization of process parameters, correct operation, and control of operating system are of great significance to ensure product q...

Claims

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Application Information

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IPC IPC(8): C04B28/04C08F251/00C08F220/46C08F228/02C04B24/16
CPCC04B24/163C04B28/04C04B2201/50C08F251/00C04B14/06C04B14/02C04B18/08C04B24/383C04B22/149C08F220/46
Inventor 韦红焰陈旭兰阙利民
Owner NANNING TONGCAI TECH CO LTD
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