Preparation method of high-impermeability concrete

Abstract

The invention solves the defects of the prior art, and provides a preparation method of high-impermeability concrete which has the advantages of full utilization of wastes, low manufacturing cost, energy conservation, environmental protection, water resistance, long service life, high strength, crack resistance, high impermeability and the like. A concrete part is composed of the following raw materials (wherein concrete has a main strength grade of C20-C60 and an anti-permeability grade of P6 or above): based on the weight of the concrete per cubic meter, 230-550 kg of the cement, 900-1300 kgof gravel, 500 to 600 kg of tailing sand, 300-400 kg of machine-made sand, 30-100 kg of fly ash, 30-100 kg of mineral powder, 5%-15% of silica fume (the percentage of the content of cement gum and anoptimal mixing amount of about 10%), 6.6-17.3 kg of a water reducing agent containing an air entraining agent or a single-use high-efficiency water reducing agent polycarboxylic acid, 8%-12% of an expanding agent, 5%-12% of an anti-permeability agent (different mixing amounts for different products), 0.6-1.8 kg (generally 0.8-0.9 kg) of polymer fibers (generally polypropylene PP, modified polypropylene or a mixture of several kinds of fibers) and 140-180 kg of water.

Description

technical field [0001] The invention relates to the technical field of building material engineering, in particular to a preparation method of high impermeability concrete. Background technique [0002] Concrete material is the most widely used building material in civil engineering construction. It has the characteristics of abundant raw materials, low price, simple production process and high compressive strength. It is widely respected in the field of construction engineering. However, due to the characteristics of its own structure, ordinary concrete only has a part of water and cement to hydrate during the hardening process, and the excess water evaporates after the concrete hardens and dries, forming a large number of tiny pores. At the same time, a certain amount of air is often mixed into the concrete during the mixing and pouring process, and it is difficult to completely remove it during the tamping process. These factors lead to the porous state of the hardened c...

AI Technical Summary

Problems solved by technology

These factors lead to the porous state of the hardened concrete, including closed pores, interconnected capillary channels, macroscopic pores visible to the naked eye, and microscopic pores with small diameters. It can not meet the requirements for the use of concrete materials in wading projects such as marine engineering, underground engineering, and underwater structural engineering, which seriously restricts the application of concrete materials.

Traditional measures to improve concrete impermeability mainly include adding air-entraining agents, reducing water-cement ratio, optimizing raw materials, ensuring construction quality, especially concrete vibration and curing, etc., but these methods have limited effects on improving concrete impermeability , so it is of great practical significance to prepare a new type of high impermeability concrete