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Concrete hydrating control

A technology of hydration control and concrete, which is applied in the field of concrete preparation and concrete hydration control, which can solve the problems of waste of materials and inability to change the hydration time, etc., and achieve the effect of low cost

Inactive Publication Date: 2007-03-21
SHENYANG JIANZHU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the pumping agent for concrete given in the above-mentioned technical scheme can improve the pumpability of concrete and maintain fluidity and pumpability for a long time, there are also deficiencies: after the concrete preparation is completed, the hydration time cannot be determined according to the The specific construction time is changed, which is easy to cause waste of materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] When the outdoor temperature is 30°C, add 2% Mg(NO 3 ) 2 , After 7 hours, the concrete slump is 220mm. At this time, the added Mg(NO 3 ) 2 75% NaHSO by mass 4 , After 15 minutes, the concrete slump decreased rapidly to 145mm, meeting the requirements of pumping and strength.

Embodiment 2

[0018] When the outdoor temperature is 25°C, add 5% of cement mass Mg(NO 3 ) 2 , After 15 hours, the concrete slump is 205mm. At this time, the added Mg(NO 3 ) 2 50% NaHSO by mass 4 , After 15 minutes, the concrete slump decreased rapidly to 130mm, meeting the requirements of pumping and strength.

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PUM

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Abstract

A concrete hydrating controlling method includes adding Mg(No3)2 with cement mass 2-5% into concrete at outdoor temperature 20-35DEG C, keeping concrete collapsing degree above 200mm after 5 hrs, adding NaHSO4 into Mg(NO3)2 with mass 50-75%, and decreasing concrete collapsing degree to 125-150mm after 15mins to reach to requirement for pump transfer and strength. It achieves controllable hydrating time, simple raw materials and low cost.

Description

technical field [0001] The present invention relates to a kind of concrete hydration control method for preparing building, particularly relate to a kind of adding Mg(NO 3 ) 2 with NaHSO 4 The concrete hydration control method of the invention belongs to the concrete preparation technology. Background technique [0002] Modern concrete has gradually changed from on-site mixing to commercial concrete, which is mass-produced by concrete manufacturers in the factory, transported to the construction site according to the requirements of each construction site for concrete strength and quantity, and then pumped to the designated construction site by a concrete pump . This method greatly saves production costs, reduces the labor intensity of workers, and ensures the quality of construction. [0003] However, this production method puts forward higher requirements on the fluidity of concrete. Because the concrete needs to be pumped to the designated construction site by a conc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/08C04B22/14
Inventor 王博
Owner SHENYANG JIANZHU UNIVERSITY