High-temperature molten slag composite micropowder concrete and preparation method thereof

Abstract

The invention relates to a high-temperature molten slag composite micropowder concrete and a preparation method thereof. The preparation method comprises the following steps: stirring and mixing cement, high-temperature molten slag composite micropowder, macadam, river sand, a water reducing agent and water, and carrying out hydration setting. Every cubic meter of the high-temperature molten slag composite micropowder concrete contains 170-360kg of cement, 100-270kg of high-temperature molten slag composite micropowder, 1000-1100kg of macadam, 650-800kg of river sand, 170-195kg of water and 4-6.5kg of water reducing agent. The high-temperature molten slag composite micropowder used as the auxiliary cementing material can effectively improve the bleeding isolation and workability of the concrete and enhance the working performance of the concrete; as compared with the cement concrete, the long-term folding strength, cleavage strength and chlorine ion penetrating resistance are greatly enhanced, thereby being beneficial to improving the toughness and durability of the concrete; and the high-temperature molten slag composite micropowder concrete lowers the cost, and has the advantages of energy saving and environment friendliness.

Description

technical field [0001] The invention belongs to the field of high-performance building materials, and in particular relates to a high-temperature slag composite micropowder concrete and a preparation method thereof. Background technique [0002] Cement concrete is one of the most widely used building materials in contemporary times and is widely used in the field of infrastructure construction. With the increasingly widespread application of cement concrete, its performance degradation in natural environments has gradually been exposed and attracted people's attention. Ordinary cement concrete has disadvantages such as poor deformation ability, low tensile strength, small ultimate elongation, poor toughness, and easy shrinkage and cracking after gelation and hardening. With the increase of cement concrete strength, these shortcomings become more and more obvious. The brittleness of ordinary cement concrete has caused great harm to its safety and durability, which seriously ...

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Problems solved by technology

Ordinary cement concrete has shortcomings such as poor deformation ability, low tensile strength, small ultimate elongation, poor toughness, and easy shrinkage and cracking after gelation and hardening. With the increase of cement concrete strength, these shortcomings become more and more obvious.

The brittle characteristics of ordinary cement concrete have caused great harm to its safety and durability, which seriously restricts the further application of cement concrete

[0003] Chinese patent CN103588447A "a kind of mineral powder superfine admixture concrete" proposes that mineral powder superfine powder and fly ash are mixed into concrete as an admixture to improve the early strength and durability of concrete, but only adding mineral powder superfine Fine powder will increase the water demand of concrete, and after the concrete is formed, it will cause serious drying shrinkage and reduce the durability of concrete

Chinese patent CN103342526A "Concrete prepared from steel slag powder" proposes to mix steel slag powder and cement in equal amounts to prepare concrete, but the patent does not specify the compounding ratio and fineness of steel slag powder and slag powder in steel slag powder and other specific parameters, and only adding iron and steel slag powder without adding fly ash can not give full play to the advantages of Ca-Si-Al compatibility and compounding, and the effect of improving the performance of concrete is very limited

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