Research On The Composition And Properties Of High Performance Concrete Materials For The Composite Mineral Admixture

In view of the increasingly complex environment in bridge engineering, the corrosion of high performance concrete is becoming more and more serious, the stability and durability of the concrete members are gradually attenuated and degraded. In this paper, a systematic study on the composition design and performance of high performance concrete of composite mineral admixture is carried out on the basis of summarizing the main disease and the cause of disease.The main diseases of bridge concrete summary appears in the use process and based on analysis of the causes of disease, the initial algorithm calculation of C50 type high performance concrete mix ratio, according to the requirements of harsh environmental conditions and site construction technology, the water cement ratio, total cementitious material, fly ash the slag powder content, and the amount of additives as the main control parameters, to meet the performance and the work performance of concrete mechanical conditions, selection of concrete durability parameters for key performance indicators. The influence of water cement ratio, cement content, sand ratio and mineral admixture on the workability and mechanical properties were studied. The durability of its anti- cracking, anti-sulfate attack resistance, frost resistance, permeability resistance, etc., and its microstructure is analyzed.