High-efficiency concrete water reducer and preparation method thereof

Abstract

The invention discloses a high-efficiency concrete water-reducing agent, which is prepared from the following raw materials in parts by weight: 80-90 parts of polycarboxylate water-reducing agent, 0.16-0.18 parts of defoaming agent, 1-1.2 parts of viscosity regulator, modified 0.8-0.9 parts of lignin; the invention also discloses a preparation method of the high-efficiency concrete water-reducing agent. The present invention uses the self-made polycarboxylate water-reducing agent as the main substance, and the hydrophilic groups carboxyl (-COO-), amino (-NH) contained in the self-made polycarboxylate water-reducing agent 2 ), hydrophobic group ester group (‑COOR) and the synergistic effect of polyether side chains are beneficial to its wetting and adsorption on the surface of concrete and concrete particles and the relative lubrication between aggregate particles; through defoamer and modified wood Quantitative addition of the element can lead to proper amount of air entrainment in the concrete, improve the workability of the concrete and reduce the viscosity of the concrete, and has a certain slump retention performance for the concrete. Workable concrete water reducer.

Description

technical field [0001] The invention belongs to the technical field of concrete processing, and in particular relates to a high-efficiency concrete water reducer and a preparation method thereof. Background technique [0002] Concrete water reducer is an admixture used to reduce the water required for concrete hardening, thereby improving the strength of concrete. The traditional concrete water reducer is mainly based on naphthalene and melamine products. In recent years, with the vigorous development of the construction industry at home and abroad, the demand for concrete superplasticizers has increased year by year. Concrete has developed in the direction of high strength, light weight and construction fluidization. Water action and better slump performance. Because the traditional naphthalene-based and melamine-based water-reducing agents have problems such as low water-reducing rate and too fast loss of fresh concrete slump, it is difficult to meet the increasingly comp...

AI Technical Summary

Problems solved by technology

Because the traditional naphthalene-based and melamine-based water-reducing agents have problems such as low water-reducing rate and too fast loss of fresh concrete slump, it is difficult to meet the increasingly complex and large-scale construction requirements of actual projects. Their composite products and cement The adaptability of the water reducing agent is also unstable, and even affects the setting, hardening and durability of the concrete. As the amount of water reducing agent used in the construction market increases, the problem becomes more prominent. Therefore, there is an urgent need for new high-efficiency water reducing agents.

[0003] At present, in some developed countries abroad, such as the United States, Japan, Italy and other countries, maleic anhydride-based and acrylic-based high-performance concrete water reducers have been widely used in concrete projects requiring high durability such as water conservancy and roads. Although the technology is relatively mature , but due to the complex preparation process and high requirements for reaction equipment, it is restricted in the application and promotion of practical engineering

About the study of new carboxylic acid polymer water reducer after the concept of high performance concrete in this field was proposed, starting from the study of reactive polymer maleic anhydride-olefin sulfonate copolymer, mainly used for concrete slump loss In addition, the existing technology still has the problem that its excellent water reducing performance cannot be fully reflected due to the large amount of water reducing agent and the weak slump retention ability.

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