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Environment-friendly type alkali-free liquid accelerator for sprayed concrete and preparation method thereof

A shotcrete and environment-friendly technology, applied in the field of building materials, can solve the problems of rare use and high unit price, and achieve the effects of low cost of raw materials, low cost, and no loss of strength in the later stage.

Inactive Publication Date: 2009-05-06
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Related products are mainly controlled by some well-known multinational concrete admixture manufacturers, but due to the high unit price, they are rarely used in my country at present

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1, the environment-friendly non-alkali liquid quick-setting agent is formulated according to the weight percentage of 40% of aluminum sulfate, 5% of sodium fluoride, 0.1% of triethanolamine, 0.1% of polyacrylamide, and 54.8% of water. When mixing 7% of cement weight and 0.4 water-cement ratio, the P.O52.5 reference cement will set at 2min40sec for initial setting and 9min35sec for final setting; when the mortar ratio is standard sand: cement: water = 3:2:1, the mortar The 1d strength is 10.5Mpa, and the 28d compressive strength ratio exceeds 92%.

Embodiment 2

[0029] Embodiment 2, the environment-friendly non-alkali liquid quick-setting agent is prepared according to the weight percentage of 45% of aluminum sulfate, 10% of sodium fluoride, 0.5% of triethanolamine, 0.5% of polyacrylamide, and 44% of water. When mixing 7% of cement weight and 0.4 water-cement ratio, P.O52.5 benchmark cement will set at 2min10sec for initial setting and 6min55sec for final setting; when the mortar ratio is standard sand: cement: water = 3:2:1, the mortar The 1d strength is 12.3Mpa, and the 28d compressive strength ratio exceeds 95%.

Embodiment 3

[0030] Embodiment 3, the environment-friendly non-alkali liquid quick-setting agent is formulated according to the weight percentage of aluminum sulfate 55%, sodium fluoride 15%, triethanolamine 1.0%, polyacrylamide 1.0%, and water 28%. When mixing 7% of cement weight and 0.4 water-cement ratio, the P.O52.5 reference cement will set at 1min55sec for initial setting and 5min45sec for final setting; when the mortar ratio is standard sand: cement: water = 3:2:1, the mortar The 1d strength is 13.0Mpa, and the 28d compressive strength ratio exceeds 95%.

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Abstract

The invention belongs to the technical field of building materials, and in particular relates to an environment-friendly alkali-free liquid quick-setting agent used for shotcrete and a method for preparing the same. The alkali-free liquid quick-setting agent is a light green viscous liquid prepared from aluminum sulfate, sodium fluoride, triethanolamine and polyacrylamide, wherein the aluminum sulfate and the sodium fluoride are main quick-setting components, the aluminum sulfate can significantly reduce the initial setting time of cement, while the sodium fluoride can significantly shorten the final setting time of the cement, promote the formation of a hydrate structure, and improve the shear strength of the concrete and the binding power of a reinforcing steel bar. The triethanolamine shortens the setting time of the concrete to csertain extent and greatly improves the 1d compressive strength of mortar, and the polyacrylamide is an organic tackifying component to improve the thickness of a primarily sprayed layer, improve the bond strength between the concrete and a substrate, reduce the rebound loss in the spraying process, and save materials. The environment-friendly alkali-free liquid quick-setting agent has the advantages of wide source of raw materials, low cost, simple production method, and high production efficiency, and is suitable for industrial mass production.

Description

Technical field [0001] The invention belongs to the technical field of building materials, and specifically relates to an environmentally friendly alkali-free liquid accelerating agent for shotcrete and a preparation method thereof. Background technique [0002] At present, in the construction of shotcrete in my country, the use of traditional alkaline accelerators still occupies a dominant position. Since alkaline quick-setting agents contain a large amount of alkaline substances, they will cause serious strength loss in the later stage of concrete, usually up to 30% to 50%. In addition, these quick-setting agents contain a large amount of Cl. - , has a serious corrosive effect on steel bars. There are also many related reports that because the accelerator contains a large amount of alkaline substances, it reacts with the active ingredients in the aggregate inside the concrete, causing the alkali aggregate to react, and there are many examples of engineering accidents. ...

Claims

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Application Information

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IPC IPC(8): C04B24/26C04B24/12C04B22/14C04B22/12C04B103/12
CPCC04B2103/12C04B2111/00017C04B40/0046C04B2111/1025
Inventor 秦廉张雄张永娟
Owner TONGJI UNIV
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