Waste stone dust-containing high performance superfine sand concrete gel material and use method thereof

Abstract

A high-performance superfine sand concrete cementitious material with waste stone powder and an application method thereof pertain to the field of construction materials. The method comprises the following steps: firstly, the waste stone powder is dried and sieved by a 200-mesh sieve, the sieved part and original particles of the water quenched blast furnace slag are mixed and ground to not more than 5% screen residue of 0.045mm square mesh sieve, wherein, the weight percentage of the waste stone powder is 30-40% and the weight percentage of the water quenched blast furnace slag is 70-60%; the water quenched blast furnace slag, mixed fine powder of the waste stone powder, original particles of cement clinker, a water reducing agent or a pumping agent are mixed and ground to not more than 5% screen residue of 0.045mm square mesh sieve according to a certain proportion, the powder obtained is the high-performance superfine sand concrete cementitious material. The cementitious material obtained, superfine sand and coarse aggregate are mixed to obtain the high-performance superfine sand concrete with good working performance, low dry shrinkage, no crack, high strength and good lasting quality. The material has the three beneficial effects of consuming waste stone powder, solving the problem of sand rareness in normal construction in part areas and promoting popularization and application of the high performance concrete.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to a high-performance ultra-fine sand concrete cementitious material containing waste rock powder and its manufacturing and application method. Background technique [0002] my country's total stone output in 2007 was 2.4 billion meters 2 , need to process 48 million meters of waste stone 3 , equivalent to 125 million tons. Calculated on the basis of 50 kg of waste rock powder per cubic meter of stone cutting and grinding, 6.25 million tons of waste rock powder are produced nationwide every year. Most of the waste rock powder produced by the stone cutting and grinding process is fine powder of tens of microns and several microns, and there are very few coarse particles. Therefore, the discharge and storage of waste rock powder are very easy to cause environmental pollution, especially in stone industry-intensive areas. It has become one of the main restrictive factors for the su...

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to reprocess waste rock powder so that it has two aspects of gradation and activity among other mineral admixtures, cement clinker, various admixtures and coarse and fine aggregates in ultra-fine sand high-performance concrete. The synergistic double optimization of the existing ultra-fine sand high-performance concrete solves the problems of high cost of cementitious materials caused by excessive cement consumption and poor water-reducing agent effect, which is prone to shrinkage and cracking, thereby promoting the bulk of waste rock powder. Value Utilization and Application of Extra Fine Sand in High Performance Concrete