Wet-mixed mortar additive and preparation method thereof

Abstract

The invention provides an additive capable of improving the water-retention rate and the operation time of a wet-mixed masonry mortar, a plastering mortar or a floor mortar in the building field. The additive comprises a component A and a component B, wherein the component A is prepared from the following components in percentage by weight: 1 to 1.5 percent of water-retaining agent, 0.1 to 0.5 percent of air entraining agent, 2 to 5 percent of water reducing agent, 2 to 4 percent of early strength agent, 1 to 5 percent of coagulant, and the balance of water through mixing and stirring; the component B is prepared from the following components in percentage by weight: 5 to 20 percent of sodium gluconate, 2 to 10 percent of saccharose, 1 to 6 percent of borax,and the balance of water through mixing and stirring; the water-retaining agent is methyl hydroxyethyl cellulose ether with the viscosity being 10000 to 20000mpas; the air entraining agent is one or two of sodium alpha-olefin sulfonate or fatty alcohol-polyoxyethylene ether sodium sulfate. The additive provided by the invention is reasonable in formula and convenient to use, can enable the wet-mixed mortar to have a better water-retaining property at high temperature when being added into the wet-mixed mortar, and has better storage stability. The invention also provides a preparation method of the additive.

Description

technical field [0001] The invention relates to a construction mortar additive, in particular to a wet-mix mortar additive, and more particularly to an additive capable of improving the water retention rate and operating time of wet-mix masonry mortar, plastering mortar or floor mortar in the construction field. Background technique [0002] At present, under the requirements and guidance of relevant national industrial policies, especially environmental protection and energy policies, large, medium and small cities across the country have begun to prohibit on-site mixing of mortar, and vigorously promote ready-mixed mortar. Ready-mixed mortar has two types: dry-mixed mortar and wet-mixed mortar. kind of form. Dry-mixed mortar is composed of solid materials such as cementitious materials, mineral admixtures, fine aggregates, and admixtures. It is a dry powder building material that is pre-mixed through a dry-mixing process according to a certain ratio. Mortar is easy to seg...

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Problems solved by technology

[0004] The Chinese patent No. 201410406681.1 provides a wet-mixed mortar admixture, the admixture is composed of A material and B material, A material is composed of the following components by weight: air-entraining agent: 0.8% ~ 2%, Retarder: 2% to 4%, anti-cracking agent: 0.06% to 0.15%, reinforcing agent: 0.6% to 1.2%, water retention agent: 0.3% to 0.7%, and the balance is water; material B consists of the following weight percentage Component composition: water reducing agent: 3% to 12%, shrinkage reducing agent: 0.2% to 0.5%, and the balance is water; since this admixture contains both water retaining agent and retarder in component A, if necessary adjust The operating time of the wet-mixed mortar will inevitably change the amount of each substance added in component A, so that the added amount of the water-retaining component will also change accordingly, and the water-retaining property and density of the wet-mixed mortar will be affected. If you need to solve this problem, you can It is necessary to configure different proportions of component A for different operating times, which is inconvenient for production and use

In addition, when the temperature of sand, cement, water, etc. is high in summer, the wet-mixed mortar added with this admixture will have significantly lower water retention performance and poor storage stability.

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