High-strength alkali-free liquid accelerator and preparation method thereof

Abstract

The invention relates to a high-strength alkali-free liquid accelerator and a preparation method thereof. The high-strength alkali-free liquid accelerator comprises the following raw materials in percentage by mass: 14-30% of aluminum sulfate, 5%-10% of fluorine-containing acid, 5%-9% of aluminum hydroxide, 2%-7% of alcohol amine compounds, 10%-20% of an organic polymer coagulation accelerating component, 0.5%-2% of a dispersing agent, and the balance of water, wherein the sum of the mass percentages of the components is 100%. The invention also comprises a preparation method of the accelerator. The high-strength alkali-free liquid accelerator disclosed by the invention is stable in property and good in accelerating effect; when being used in concrete, the accelerator is short in setting time, high in early strength, high in later strength retention rate and low in injection resilience rate; the accelerator can be widely applied to supporting, leaking stoppage and repair of tunnels, highways, railways, mines and subways.

Description

technical field [0001] The invention relates to an accelerator and a preparation method thereof, in particular to an alkali-free liquid accelerator and a preparation method thereof. Background technique [0002] Accelerator is a chemical admixture that can make cement paste, mortar or concrete set and harden quickly without unduly affecting its long-term strength. Since the production and use of the accelerator, it has become one of the important constituent materials of shotcrete by virtue of its remarkable characteristics in quick setting and early strength. Especially with the increase in the number and scale of underground projects, accelerators, as the constituent materials of concrete, are not only becoming more and more important, but also indispensable in some specific projects. They are widely used in mine shafts, tunnels, etc. The anchor shotcrete support of the project, as well as the plugging and emergency repair projects. [0003] There are many kinds of accel...

AI Technical Summary

Problems solved by technology

Alkaline powder accelerators and alkaline liquid accelerators have the following problems in the construction process: 1, resulting in a large loss of cement concrete strength in the later stage; 2, high alkali content, will damage the health of construction workers It is healthy, and because the alkali content is too high, it will cause the alkali-aggregate reaction of the concrete, which will lead to a substantial decrease in the strength and durability of the concrete; third, the rebound of the concrete after construction is large and it is not conducive to wet operation

This technical scheme uses aluminum hydroxide as a raw material to provide aluminum ions, and the stabilizer is polymerized from fluorine-containing compounds and acrylic acid. The disadvantage is that aluminum hydroxide is difficult to dissolve in water. When the amount is too large, the stability of the accelerator obtained is poor. , the ammonia smell is strong, which affects the health of the construction workers and also has an adverse effect on the quick-setting effect

This scheme uses aluminum sulfate and soluble aluminum trifluoride as the main components, and sodium silicate supplements the coagulation-accelerating effect to prepare an alkali-free liquid accelerator. The final product contains silicon dioxide, which is easy to settle, and sodium silicate is in the Almost insoluble in acidic system, the resulting accelerator has poor stability

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