Study Of The Design Method For The Ready Mixed Concrete

Concrete mix design is the core technology of concrete, is an important link to decide the properties of concrete. With the construction of concrete workability requirements more and more high, the main problem becomes the rheological properties of concrete. At the same time, the changes in the development of concrete technology has also led to the concrete mix design theory and method innovation. In mix design of concrete, modern six component concrete than traditional four components more complicated. In addition, because of Chinese vast territory, different climate and environment, the physical and chemical properties of raw materials are different, the raw materials of concrete types continue to increase, leds to the current concrete design method of our country in the using process persented the applicability problem and their shortcomings.This subject based on analysis and study of existing results, full investigation of actual production and engineering application of concrete, put forward a new concrete mix design method. The core technology of this method is to meet the need for concrete engineering, on the basis of quality raw materials to calculating cementitious material consumption, on the basis of strength, durability and composition of cementitious materials selection of water binder ratio, concrete strength grade, according to the choice of gravel stone porosity volume. The method in the research process, through to our country north, northwest several mixing analysis than the actual production data of concrete station, through mathematical statistics, establish scientific fitting cementitious materials dosage calculation formula. The formula for the strength grade of concrete and the raw material quality as the basis, focus on ensuring the workability of concrete. The strength grade of concrete, admixture variety and content of reasonable selection of water binder ratio, ensure the concrete strength and durability requirements. According to the amount of cementitious materials and water cement water ratio calculatioa Through reasonable selection of gravel volume, on the basis of the absolute volume method to calculate the quantity of sand, no sand rate as the mix design parameters. Adding an appropriate amount of water reducing agent meet workability requirements. The final formation of practical concrete mix. Indicates that the test lab and large engineering design approach for calculating the dosage:ratio of different grades of the cementitious material of the concrete results are reasonable with ready mixed concrete quality based on raw material, not only to meet the fresh concrete workability, and good control of the paste aggregate ratio, favorable to the mass concrete structure stability, strong applicability in practice production.The characteristics of this method is to get rid of the specification to the water cement ratio and strength as the design theme ideas, try to use water-durability as the design route; method of determining the cementitious materials dosage formula and stone volume of strong operability and innovative.