Slag-limestone powder supplementary cementious material-based concrete

Abstract

The invention discloses slag-limestone powder supplementary cementious material-based concrete and belongs to concrete. The water-binder ratio of the concrete is between 0.37-0.51, the concrete is prepared from the following components by weight percent: 14-20% of cementing materials, 27-33% of sand, 44-46% of pebbles, 7.1-7.4% of water and an additive accounting for 1.5% of cementious material; the cementing material is prepared by mixing the components by weight percent: 50% of ordinary portland cement, 30% of slag and 20% of limestone powder; and the specific surface area of the limestone powder is 350m<2> / kg, 450m<2> / kg or 650m<2> / kg. The slag-limestone powder supplementary cementious material-based concrete has the advantages that the concrete is prepared from slag-limestone powder as the supplementary cementious material of the portland cement, so that the mechanical property and the working performance of the concrete are improved, the endurance characteristics such as the freezing resistance, the anti-permeability and the sulfate corrosion resistance of the concrete are improved, the cement content is reduced, the hydration heat of the cement is further reduced, the concrete temperature rise is reduced, the material source is abundant, and the preparation cost of the composite cement and the concrete can be greatly reduced by adopting industrial wastes such as tailings and coal gangue and the raw materials such as abandoned stones and stone chips as raw materials.

Description

technical field [0001] The invention relates to a kind of concrete, especially a kind of concrete based on slag-limestone powder auxiliary cementitious material suitable for waste utilization. Background technique [0002] 1. There are problems in my country's cement production: the contradiction of redundant construction and overcapacity has not been effectively resolved; the number of outdated production capacities is large; the overall industrial concentration is still low; resource waste, environmental pollution, and disordered production are still relatively serious. [0003] 2. There are problems in the development of the concrete industry: high energy consumption and serious pollution; fierce competition and small profit margins; problems in the development of new concrete. [0004] 3. At present, fly ash is the most used mineral admixture in my country, but the distribution of fly ash resources is uneven. In many areas, the supply of fly ash is insufficient, and the ...

AI Technical Summary

Problems solved by technology

[0007] Technical problem: the purpose of this invention is to overcome the deficiencies in the prior art and provide a concrete based on slag-limestone powder auxiliary cementitious material to solve the shortage of mineral admixtures, industrial waste slag and waste stone stacking and pollution environmental problems