Concrete compound step-by-step stirring process

Abstract

The invention discloses a concrete compound step-by-step stirring process which comprises the following steps: according to raw materials required by the mixing ratio of concrete, putting fine aggregate and cement into a stirring machine A, stirring for t1, then adding a certain mass of water, and stirring for t2 to prepare cement mortar; when the cement mortar is prepared, coarse aggregate is put into a stirring machine B, then a certain mass of water is added, and stirring is conducted for the time t3; adding the rest mass of cement into the stirrer B, and stirring for t4; adding the cement mortar into the stirrer B, and stirring for t5; and finally, adding the additive and the rest water into the stirrer B, stirring for t6, and discharging to finish the whole stirring process. In general, the invention has the advantages of improving the interfacial strength of coarse aggregate and fine aggregate, enhancing the mechanical properties of concrete and reducing the cement consumption.

Description

technical field [0001] The invention relates to the technical field of concrete mixing, in particular to a concrete compound step-by-step mixing process. Background technique [0002] The traditional mixing process uses cement, aggregate, water, admixtures, etc., which are put into the mixing pot for mixing and then discharged to form fresh concrete. The advantage is that the mixing equipment and process are simple. However, when the sand and gravel material meets water, a layer of free water film is easily formed on the surface, which increases the water-cement ratio in the interface area, thereby weakening the bonding strength between cement slurry and aggregate, and making the role of cement slurry far from being exerted. It is also found in practical applications that the strength failure of concrete often occurs at the interface between cement stone and aggregate, and cracks are easy to generate and expand from the interface area, resulting in a reduction in the service...

AI Technical Summary

Problems solved by technology

However, when the sand and gravel material meets water, a layer of free water film is easily formed on the surface, which increases the water-cement ratio in the interface area, thereby weakening the bonding strength between cement slurry and aggregate, and making the role of cement slurry far from being exerted. It is also found in practical applications that the strength failure of concrete often occurs at the interface between cement stone and aggregate, and cracks are easy to generate and expand from the interface area, resulting in a reduction in the service life of many concrete structural projects; in addition, macroscopically uniform concrete is still 10%~30% of the cement particles cohere into tiny cement clusters, and the cement hydration is not sufficient, which not only wastes cement, but also affects the strength and workability of concrete; obviously, there are many deficiencies in the traditional mixing process, resulting in cement High consumption of raw materials and uneven mixing are major technical problems that have plagued the concrete production industry for many years.