Accelerator

An accelerator and high-speed stirring technology, which is applied in the chemical industry, can solve the problems of odor and damage to the human body, and achieve the effects of no irritating odor, good cohesiveness, and high later strength preservation rate

Active Publication Date: 2014-05-21
贵州遵辉环保科技有限公司
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Problems solved by technology

However, the existing quick-setting agents are mostly alkaline, have a c

Method used

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Embodiment Construction

[0011] The quick-setting agent is an additive whose dosage only accounts for 1% to 3% of the amount of cement in the concrete, but it can make the concrete set initially within 1-3 minutes and finally set within 2-5 minutes. In order to achieve the purpose of emergency repair or rapid condensation of concrete in the shaft. It is an indispensable additive in shotcrete construction method. Its function is to accelerate the hydration and hardening of cement and form sufficient strength in a short period of time to meet the requirements of special construction. Because our country's traditional quick-setting agent uses inorganic salt accelerator, the cost is relatively low, but because of strong alkalinity, it will cause certain damage to the human body.

[0012] According to many years of practical experience, the present invention has developed a new type of quick-setting agent. The effect of the quick-setting agent is equivalent to that of inorganic salt quick-setting agents, ...

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Abstract

The invention relates to an accelerator. The formula thereof comprises the constituents in percentage by weight: 50-55% of polyaluminium sulphate, 4-6% of polyethyleneimine, 2-5% of sodium lignosulphonate and 36-40% of water, wherein the sum of the constituents is 100%. A method for preparing the accelerator by the formula above comprises the following steps of: (1) weighing the constituents with the needed dosages according to the formula above for the future use; (2) crushing the prepared polyaluminium sulphate into fine powder, and passing through a 180-mesh sieve to obtain polyaluminium sulphate powder for the future use; and (3) dissolving the obtained polyaluminium sulphate powder in water and uniformly stirring, then adding the prepared polyethyleneimine and sodium lignosulphonate, stirring, and then pouring in a high-speed stirrer and stirring for 15-20 minutes to obtain the accelerator. The accelerator disclosed by the invention is a concrete additive which is alkali-free, free from pungent odour, good in cohesiveness, low in resilience and high in later strength preserving rate, prepared by virtue of the characteristics of each formula material, and is especially suitable for construction and use in culverts, bridges, underground projects and the like.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular to an accelerator for building concrete. Background technique [0002] Concrete accelerators refer to admixtures that can quickly set and harden concrete. Accelerators mainly include inorganic salts and organic substances. The commonly used quick-setting agent in our country is the inorganic salt quick-setting agent mixed with concrete, which can make the concrete set in the initial setting within 3-6 minutes, and finally set in 5-9 minutes. It can produce strength in 1 hour, and the strength can be increased by 2-3 times in 1 day. However, the strength will decrease in the later period, and the 28d strength is about 70% to 80% of that without mixing. The mechanism of quick setting and early strength of the accelerator is to make the gypsum in the cement into Na 2 SO 4 , lose the retarding effect, thereby promoting C 3 A (tricalcium aluminate) hydrates rapidly and precipitates i...

Claims

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Application Information

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IPC IPC(8): C04B24/26C04B24/18
Inventor 文邦祥
Owner 贵州遵辉环保科技有限公司
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