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Water-reducing and early-strength antifreeze

A technology of antifreeze and early strength agent, applied in the field of water-reducing early strength antifreeze agent, can solve problems such as inability to effectively ensure construction quality and lack, and achieve excellent antifreeze and early strength performance, accelerated construction, and good workability. Effect

Inactive Publication Date: 2011-12-28
HANDAN JUNQIANG MINE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there is a lack of special admixture products that meet the above requirements for the construction of the shaft wall freezing method, and the construction quality cannot be effectively guaranteed in actual construction.

Method used

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  • Water-reducing and early-strength antifreeze

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The naphthalene-based high-efficiency water-reducer is SSF-1000 naphthalene-based water-reducer.

[0023] The early strength agent is sodium sulfate.

[0024] Mineral admixture fly ash: GB / T 18376-2002 Class II.

[0025] Weigh according to the following proportions: 20kg of water reducing agent, 16kg of early strength agent, 8kg of antifreeze calcium nitrite, and 56kg of fly ash as mineral admixture.

[0026] Prepare as follows:

[0027] Stir the naphthalene-based high-efficiency water reducer and the mineral admixture fly ash for 3 minutes, then add the early strength agent and antifreeze in turn and stir for 7 minutes.

[0028] The application of the water-reducing and early-strength antifreeze agent prepared in this example in the construction of the cucurbitacin coal mine shaft freezing method (the temperature is -10~-15°C):

[0029] The sand is made of coarse sand produced in Hangjin Banner, with a fineness modulus of 3.2;

[0030] The stone is made of Wuhai cr...

Embodiment 2

[0039] The naphthalene-based high-efficiency water-reducer is FDN naphthalene-based water-reducer.

[0040] Potassium sulfate is used as early strength agent.

[0041] Mineral admixture fly ash: GB / T 18376-2002 level II.

[0042] Weigh according to the following proportions: 18kg of water reducing agent, 20kg of early strength agent, 9kg of antifreeze calcium nitrite, and 53kg of fly ash as mineral admixture.

[0043] Prepare as follows:

[0044] Stir the naphthalene-based high-efficiency water reducer and the mineral admixture fly ash for 3 minutes, then add the early strength agent and antifreeze in turn and stir for 7 minutes.

Embodiment 3

[0046] The naphthalene-based high-efficiency water-reducer is SSF-1000 naphthalene-based water-reducer.

[0047] The early strength agent is sodium sulfate.

[0048] Mineral admixture fly ash: GB / T 18376-2002 level II.

[0049] Weigh according to the following proportions: 18kg of water reducing agent, 20kg of early strength agent, 9kg of antifreeze calcium nitrite, and 53kg of fly ash as mineral admixture.

[0050] Prepare as follows:

[0051] Stir the naphthalene-based high-efficiency water reducer and the mineral admixture fly ash for 3 minutes, then add the early strength agent and antifreeze in turn and stir for 7 minutes.

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Abstract

The invention discloses a water-reducing and early-strength antifreeze agent, which is composed of the following raw materials by weight percentage: 18-25% of naphthalene series high-efficiency water-reducer, 13-20% of early-strength agent, and 5-13% of antifreeze calcium nitrite %, mineral admixture fly ash 53-60%, and the early strength agent is sulfate. Stir the naphthalene-based high-efficiency water reducer and the mineral admixture fly ash for 3 minutes, then add the early strength agent and antifreeze in turn and stir for 7 minutes. The water-reducing and early-strength antifreeze agent of the present invention can significantly improve the early strength of concrete in construction under low negative temperature conditions, reduce cracks, and improve the durability of the well wall, thereby meeting the requirements for reducing the strength of the well wall, cracking resistance, waterproofing, early strength, and improving Durability requirements.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a water-reducing early-strength antifreeze agent. Background technique [0002] At present, the construction of shaft wall freezing method is the main method in coal mine shaft construction. In the freezing method construction, the lateral pressure of the frozen wall acting on the outer well wall is called the freezing pressure. After the wellbore is excavated, the freezing pressure can reach 70-80% within 7 days, sometimes up to 90%, but the outer well wall Concrete is poured and cured under low temperature conditions, the hydration reaction is slow or stops, and the strength growth is small, generally only 30-40% of the design strength, so that the early strength of the outer well wall is not compatible with the increase of freezing pressure, so that the outer Well walls were damaged. In addition, concrete also bears vertical pressure and permanent ground pressure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/00
Inventor 吴文丰王丽娟常洪波吴然丰张萍
Owner HANDAN JUNQIANG MINE TECH
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