High-performance concrete with large mixing amount of mineral powder and manufacturing method of high-performance concrete

Abstract

The invention discloses high-performance concrete with a large mixing amount of mineral powder and a manufacturing method of the high-performance concrete. The high-performance concrete is manufactured from cement, slag powder, coal ash, crushed stone, river sand, water, an exciting agent, and a water reducer, and comprises, by weight part: 140-170 parts of cement, 170-240 parts of slag powder, 50-100 parts of coal ash, 1010-1100 parts of crushed stone, 735-825 parts of river sand, 150-180 parts of water, 11-15 parts of an exciting agent, and 3.4-5 parts of a water reducer. Slag powder and coal ash are re-mixed into the concrete as a supplementary cementitious material, through an exciting effect of the sodium sulfate exciting agent, to manufacture the high-performance concrete with a large mixing amount of mineral powder. Long-term strength, durability, and working performance of the cement concrete are effectively improved. A large amount of industrial waste, such as mineral powder and coal ash, is utilized in the formula, thereby reducing cement consumption in pre-mixed concrete. The cost is reduced, and the method is energy-saving and eco-friendly.

Description

technical field [0001] The invention belongs to the field of preparation of high-performance building materials, in particular to a high-performance concrete with a large amount of mineral powder and a preparation method thereof. Background technique [0002] As one of the most commonly used building materials in China, cement concrete has an important existence value in the entire construction industry. With the increasingly wide range of applications of cement concrete, its performance degradation in the natural environment has gradually been exposed and attracted people's attention. Ordinary cement concrete has high compressive strength and high rigidity, but there are disadvantages such as easy shrinkage and cracking, low flexural strength, poor toughness, and small ultimate elongation during gelation and hardening, and these shortcomings increase with the strength of cement concrete. increase becomes more and more obvious. [0003] In recent years, the rapid developme...

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Problems solved by technology

[0004] Chinese patent CN103922680A "Method for configuring green high-performance concrete with large-volume mineral admixtures" proposes to prepare concrete with S95 grade slag powder and II-grade fly ash as mineral admixtures to save resource consumption and protect the environment, but this In this method, the maximum amount of slag powder only accounts for 25% of the total mass of the cementitious material, and the amount is low, so the contribution to energy saving and emission reduction is very limited; Chinese patent CN103819157A "a new type of concrete" proposes that Coal ash is used as an auxiliary cementing material and activated with a large amount of activator to improve the strength, compactness and durability of concrete. It will increase the peak heat release of cement, resulting in temperature difference cracks in concrete, and the early hydration of concrete is very fast, but there is almost no increase in strength in the later stage, which is not conducive to the exertion of concrete strength

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