Concrete additive, and applications thereof

Abstract

The invention discloses a concrete additive. The concrete additive is prepared via mixing of an inhibition component 1, an inhibition component 2, an inhibition component 3, and an adjusting component at a ratio of 0.05-1:0.05-0.5:0.05-0.5:0.05-0.3. The invention also discloses applications of the concrete additive in concrete. According to an application method, the concrete additive is added into concrete, and an obtained mixture is mixed to be uniform in a stirring equipment, wherein the weight amount of the concrete additive accounts for 0.2 to 1.8% of the total weight of an obtained concrete cementing material. A preparation method is simple; the concrete additive is convenient to use, is green, is friendly to the environment, is capable of reducing cement 7d hydration heat obviously, reducing concrete early stage adiabatic temperature rise and concrete membrane internal peak temperature rise, and delaying generation of temperature peak by 1 to 2 days, and is beneficial for reducing of concrete early stage temperature stress, reducing of cracking caused by relatively large concrete early stage temperature difference, and increasing of concrete middle-later stage strength.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to an admixture capable of reducing the temperature rise of concrete hydration heat and its use in concrete. Background technique [0002] Concrete cracks have always been a difficult problem in the construction industry. Domestic and foreign scholars have investigated and analyzed concrete structure cracks and found that "non-load cracks" caused by non-load in concrete structures account for about 80% of the total number of cracks. Among them, the temperature shrinkage cracks of concrete account for the majority of "non-load cracks", especially in mass concrete. The early hydration of mass concrete produces a large amount of hydration heat, which accumulates inside and has no time to dissipate. The internal temperature rises sharply within 1-2 days, even reaching 70-80°C in summer. In the cooling stage, the internal temperature of the concrete drops to 30°C or below,...

AI Technical Summary

Problems solved by technology

[0005] EP1233008A1 discloses a cement admixture and a cement composition. This method suppresses the heat of hydration of concrete by adding dextrin, but the effect of reducing the temperature rise of concrete is not obvious and cannot meet the requirements of actual engineering use.

[0006] CN1108226A discloses an admixture for reducing the heat of hydration of concrete. The admixture mainly contains chlorides of iron, calcium and zirconium and an aromatic alkane sodium sulfonate surfactant, which can reduce the 3D heat of hydration of cement by about 30%. , but the product contains chloride ions, which affects the durability of concrete, and does not explain the actual application effect in concrete structures

[0007] CN1810703A discloses a preparation method of concrete heat of hydration reducer, which is prepared by hydrolyzing copolymers such as hydroxycarboxylic acid-starch at a certain temperature. Its preparation process is complicated, involving solid-liquid separation and drying process, and the strength of concrete 7d is significantly reduced

[0010] In the currently published patents, most of the hydration heat control materials are made of starch or dextrin materials through hydrolysis or high-temperature gelatinization modification, and their hydration temperature control performance in actual concrete structures has not been studied in depth. Moreover, the preparation process of the product is more complicated, and the economy and environmental protection still need to be improved