Alkali-activated high-performance water reducer and preparation method thereof

Abstract

The invention discloses an alkali-activated high-performance water reducer and a preparation method thereof. The alkali-activated high-performance water reducer comprises a composite alkali-activator, a composite water reducer, black liquor of a paper mill, a composite retarder, a composite air entraining agent, a composite thickener, a composite regulator and the balance of water. The preparation method for the alkali-activated high-performance water reducer comprises the following steps of: adding the components and water to a reaction kettle in sequence; and mixing and carrying out a reaction on the components and the water under the room-temperature environment to obtain the finished product. The alkali-activated high-performance water reducer disclosed by the invention can activate the cementitious activity of the mixed materials such as slag, coal ash, gangue and the like, has excellent adaptability to different cements and highly doped concrete, and can greatly reduce the adding amount of cement clinker. The alkali-activated high-performance water reducer has the characteristics of a high water-reducing agent, good peaceability, a remarkable reinforcing effect, a good collapse preventing effect, adjustable setting time and the like. Moreover, the external additive has a simple production process, no pollution, low energy consumption and low cost, can solve an environmental pollution problem of the black liquor of the paper mill, and has good practicability.

Description

technical field [0001] The present invention relates to the field of preparation of concrete admixtures, in particular to an alkali-activated high-performance water reducer and its preparation method. Background technique [0002] Portland cement has been the most widely used building material for more than a century. However, the rapidly developing Portland cement industry is increasingly facing the serious constraints of resources, energy and environmental protection. Because the production process of Portland cement is "two grinding and one burning", it consumes a lot of resources and energy. Serious impact and damage to the human living environment. In particular, raw materials such as limestone and coal are non-renewable resources, and cement clinker needs to be sintered at high temperatures, and limestone and coal are burned to emit a large amount of harmful gases. An effective way to solve the above problems is to add industrial waste, reduce the exploitation of na...

AI Technical Summary

Problems solved by technology

[0005] In view of the poor adaptability of the above-mentioned polycarboxylate high-performance water reducing agent to adding a large amount of industrial waste cement, the added industrial waste affects the strength of concrete, and the existence of existing concrete admixture products such as alkali-activated cementitious materials and poor workability In the present invention, polycarboxylic acid, alkali activator, and paper mill black liquor (mainly composed of lignosulfonate) are chemically combined, and adding retarding components, air-entraining agents, thickeners and Regulators form a whole new class of admixtures

Images