Nano modified cement-based underwater non-dispersible material and preparation method thereof

Abstract

The invention belongs to the fields of water conservancy engineering, buildings, bridges, sea bank revetments, and the like, and particularly relates to a nano modified cement-based underwater non-dispersible material and a preparation method thereof. The material is prepared from cement, mineral powder, silica fume, a superplasticizer, a defoamer and other materials, a certain amount of nano-SiO2or CaCO3 and a preferred flocculant are added, the materials are mixed evenly through a mixer, and then quartz sand is added to obtain the nano modified cement-based non-dispersible material. According to the nano modified cement-based underwater non-dispersible material, the fluidity reaches 260 cm, the underwater self-leveling can be realized, good dispersion resistance is achieved while high fluidity is achieved, the content of suspended matter is lower than 80 mg/L, 1d strength is nearly 20 MPa, and 28 d strength is greater than 50 MPa, and the micro expansion effect is achieved. The nanomodified cement-based underwater non-dispersible material can be in the forms of dry powder, wet mixed mortar or concrete, and the like, can be made into dry powder materials, and can be directly used for underwater construction by being mixed with water added on site, large-scale production and application are achieved easily, and the application requirements of the fields of the water conservancy engineering, the buildings, the bridges, the sea bank revetments can be met.

Description

technical field [0001] The invention is applied to the fields of water conservancy projects, buildings, bridges, seawall revetments and the like, and specifically relates to a nano-modified cement-based underwater non-dispersible material and a preparation method thereof. Background technique [0002] The underwater non-dispersible material is to add a flocculant to the cement-based material to make it anti-dispersive during construction in water, and add fine aggregate or coarse aggregate as needed during use. Non-dispersible materials need to have the characteristics of large fluidity, high early strength, and no shrinkage, in order to achieve convenient construction, greatly shorten the construction period, and ensure project quality. [0003] The prior art patent CN106082849A provides a kind of underwater non-dispersible high-performance concrete. The concrete is composed of cementitious material, flocculant, sand, stone, and water reducer. The cementitious material is c...

AI Technical Summary

Problems solved by technology

[0007] 1. Extensive use will lead to serious water pollution and be harmful to the human body;

[0008] 2. Other materials are solid and flocculant is viscous liquid, which is inconvenient for transportation and on-site construction;

[0009] 3. Poor anti-dispersion effect

In addition, the gelling material used in the prior art is single, with poor fluidity and dispersion resistance, low early strength, and inconvenient construction. The most important properties of non-dispersible materials are underwater fluidity and dispersion resistance. The content of turbidity is 130-150mg / L, barely meeting the standard requirements of the underwater non-dispersible concrete test procedure, but the water quality around the actual construction will still be very turbid

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