Underwater non-dispersive quick-setting and rapid-hardening cement-based composite material and preparation method and application thereof

Abstract

The invention belongs to the field of composite materials and particularly relates to an underwater non-dispersive quick-setting and rapid-hardening cement-based composite material and a preparation method and application thereof. The underwater non-dispersive quick-setting and rapid-hardening cement-based composite material is prepared from the following raw materials in percentages by weight: 32-34% of portland cement, 8.8-9% of calcium aluminate, 5-7% of magnesium oxide, 0.5-2% of sulfur trioxide, 0.2-0.3% of a polycarboxylate concrete admixture, 0.3-0.7% of a flocculating agent, 0.05-0.2% of an accelerator, 0.05-0.2% of an air entraining agent, 0.05-0.3% of a corrosion inhibitor, 26-31% of a fine aggregate, 13-18% of a coarse aggregate and 8.4-8.5% of water. The material can be used for quickly repairing a concrete building in a water conservancy project, and the repair material is capable of quickly setting and ensuring the early strength.

Description

technical field [0001] The invention belongs to the field of composite materials, and in particular relates to a cement-based composite material which is non-dispersible and quick-setting under water, and a preparation method and application thereof. Background technique [0002] With the continuous development of society, more and more hydraulic engineering projects have been launched one after another. When the traditional concrete used in the project is poured underwater, the cementitious material and aggregates are prone to severe segregation, resulting in bleeding and floating slurry, and even being washed away by water, resulting in a decrease in the strength and durability of the concrete, and causing damage to the surrounding waters of the project. severe pollution. Therefore, it is necessary to avoid contact between concrete and water as far as possible during construction, such as using cofferdam drainage method, bagging method, pre-filled aggregate grouting metho...

AI Technical Summary

Problems solved by technology

If you encounter projects that require rapid concrete setting, such as bridge piers or reservoir dams that often have cracks, scour pits, honeycombs, or encounter large waves during offshore repair operations, you need to be able to quickly set and increase strength quickly. materials, the above method is no longer applicable; for example, after a typhoon hit Qingdao’s century-old trestle bridge in 2013, the bridge deck collapsed in a large area, and the maintenance team completely dug up the collapsed trestle bridge in order to repair it, causing damage to cultural relics The main reason for the collapse of the trestle bridge is that the concrete piers have been soaked in seawater for a long time, and they are damaged under the scour of seawater. The chloride ions in the seawater penetrate into the corroded steel bars of the piers, and the damaged parts are not repaired in time. If the pier can be repaired in time, the collapse of the trestle bridge will not occur.

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