Composite retarding material and preparation method thereof

A retarding material and retarding technology, applied in the field of retarding materials, can solve problems such as the inability to achieve retarding time and damage to the working performance of concrete

Inactive Publication Date: 2020-10-30
THE 4TH ENG OF CHINA RAILWAY 5TH ENG GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, among the existing single retarding materials, monosaccharide retarding materials and polysaccharide retarding materials will definitely destroy the working performance of concrete if the concrete is to achieve a retarding time of 60 hours, while inorganic acid retarding materials Materials and organic acid retarding materials cannot achieve a retarding time of 60 hours

Method used

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  • Composite retarding material and preparation method thereof
  • Composite retarding material and preparation method thereof
  • Composite retarding material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In this embodiment, the component materials and mass percentages of the composite retarding material are shown in Table 1. After the composite retarding material is prepared, the concrete is mixed according to the following ratio: the dosage of the composite retarding material is gelling The total amount of materials is 0.15%, the water-binder ratio is 0.43, and the fly ash content is 30%. The performance test results of the concrete mixed according to the above proportions are shown in Table 2.

[0027] Table 1 Proportions of various materials in composite retarding materials

[0028] sodium gluconate sucrose Hexametaphosphate tartaric acid 60％ 30％ 5％ 5％

[0029] The concrete test result that table 2 adopts the composite type retarding material of embodiment 1 to mix

[0030]

[0031] The concrete in Example 1 has an initial setting time of 72 hours and a final setting time of 91 hours, which can fully meet the time requirements for soft...

Embodiment 2

[0033] In this embodiment, the component materials and mass percentages of the composite retarding material are shown in Table 3. After the composite retarding material is prepared, the concrete is mixed according to the following ratio: the dosage of the composite retarding material is gelling The total amount of materials is 0.15%, the water-binder ratio is 0.38, and the fly ash content is 30%. The performance test results of the concrete mixed according to the above proportions are shown in Table 4.

[0034] Table 3 Proportions of various materials in composite retarding materials

[0035] sodium gluconate sucrose Hexametaphosphate sodium pyrophosphate Sodium citrate 55％ 30％ 6％ 5％ 4％

[0036] Table 4 adopts the concrete test result that the composite retarding material of embodiment 2 is mixed

[0037]

[0038]

[0039]The concrete in Example 2 has an initial setting time of 70 hours and a final setting time of 86 hours, which can meet ...

Embodiment 3

[0041] In this embodiment, the component materials and mass percentages of the composite retarding material are shown in Table 5. After the composite retarding material is prepared, the concrete is mixed according to the following ratio: the dosage of the composite retarding material is gelling The total amount of materials is 0.16%, the water-binder ratio is 0.48, and the fly ash content is 30%. The performance test results of the concrete mixed according to the above proportions are shown in Table 6.

[0042] Table 5 Proportions of various materials in composite retarding materials

[0043] sodium gluconate sucrose Hexametaphosphate Sodium dihydrogen phosphate boric acid Sodium citrate 20％ 55％ 10％ 5％ 5％ 5％

[0044] Table 6 adopts the concrete test result mixed with the composite retarding material of embodiment 3

[0045]

[0046] The concrete in Example 3 has an initial setting time of 68 hours and a final setting time of 79 hours, whic...

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Abstract

The invention relates to a composite retarding material. The composite retarding material comprises the following components in percentage by mass: 20-80% of a monosaccharide retarding material; 0-60%of a polysaccharide retarding material; 0-52% of an inorganic acid retarding material; and 0-14% of an organic acid retarding material. The composite retarding material disclosed by the invention isnot limited by a water-binder ratio and free of the influence of concrete admixture. After concrete is added, the initial setting time of the concrete can be controlled to be freely selected between 60h and 90h, the final setting time can be controlled between 70h and 100h, the phenomenon of concrete false setting caused by monosaccharide retarders is avoided, the situation that concrete slump loss is too fast due to polysaccharide retarders is avoided, the problem that inorganic acid retarders are short in setting time is solved, and later strength increase of concrete is not affected. The invention also relates to a preparation method of the composite retarding material. The preparation method comprises the step of uniformly mixing the monosaccharide retarding material, the polysaccharide retarding material, the inorganic acid retarding material and the organic acid retarding material according to a solid mass ratio to prepare powder.

Description

technical field [0001] The invention relates to a retarding material, in particular to a composite retarding material for concrete and a preparation method thereof. Background technique [0002] The retarding material is one of the common admixtures of concrete. The retarding material can delay the hydration rate of cement, adjust the setting time of concrete, and improve the construction performance of concrete. At present, the retarding materials on the market are mainly single retarding materials, which are mainly divided into four categories: monosaccharide retarding materials, polysaccharide retarding materials, inorganic acid retarding materials and organic acid retarding materials. When it is necessary to prepare concrete with a retarding time of 60 hours and meet the requirements for the use of underwater cast-in-place piles, the above four types of single retarding materials all have obvious defects. [0003] Monosaccharide retarding materials are mainly represente...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/10C04B22/16C04B24/04C04B103/22
CPCC04B40/0039C04B2103/22C04B24/10C04B24/04C04B22/082C04B22/16C04B24/06C04B22/0013
Inventor 李瑞青朱永清陈跃龙邹琳郑宾杨阳田坤
Owner THE 4TH ENG OF CHINA RAILWAY 5TH ENG GROUP
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