Admixture for improving marine concrete impervious and anti-cracking performance

Abstract

The invention discloses an admixture for improving marine concrete impervious and anti-cracking performance. The admixture is prepared from an ammonium stearate emulsion, 3, 4, 9, 10-perylenetetracarboxylic acid anhydride (PAT), a nano-silica dispersion solution, an ultra-dispersed shrinkage-reducing type water reducer, micron-sized modified absorbent cotton cellulose and water in proportion. According to the invention, the ammonium stearate emulsion is employed to form a thin complex adsorptive layer of insoluble calcium soap in marine concrete capillary pores to block concrete capillary pores. And a PAT optimized pore structure is utilized to improve the impervious performance and work performance of marine concrete. The nano-silica dispersion solution is employed to enhance the mechanical properties of marine concrete. The ultra-dispersed shrinkage-reducing type water reducer is utilized to reduce concrete shrinkage and improve the work performance. The micron-sized modified absorbent cotton cellulose is utilized to enhance the anti-cracking performance of marine concrete. The admixture provided by the invention does not contain nitrite, chromate and the like, is chlorine-free and environment-friendly, and can greatly enhance the durability of concrete serving in a marine environment.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to an admixture for improving the impermeability and crack resistance of marine concrete. Background technique [0002] In recent years, with the continuous improvement of my country's economic development and international competitiveness, a large number of major basic projects are being constructed or planned in my country's oceans and western regions. However, the climate conditions of these basic projects are harsh, and some high-concentration corrosive media (Mg 2+ , SO 4 2- , Cl - ) can easily lead to internal structural damage of concrete materials, degradation of gelling force, and increased corrosion rate of steel bars, which will cause premature failure of engineering structures, and the service life will not reach the designed service life, resulting in huge economic losses. [0003] To improve the durability of concrete materials, the most important thing...

AI Technical Summary

Problems solved by technology

However, some waterproof admixtures containing chloride ions are likely to aggravate the corrosion of steel bars and metal embedded parts inside the concrete; waterproofing agents containing expansion components, if the early maintenance conditions of the concrete are not good, and the early expansion value of the expansion agent is too large, it is easy to cause late concrete corrosion. Cracking affects the anti-corrosion effect; admixtures containing fatty acids can form a hydrophobic layer inside the concrete, and there are hydrophobic substances in the capillary pores of the concrete, but in the case of long-term aggressive solution erosion, the effective components The bond between the concrete matrix and the degradation is easy to be leached by the erosive solution, which affects the durability of concrete

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