A Study On The Durability Of Concrete With Compound Mineral Admixtures

With the great construct of fundament in China, the use and study of concrete developed quickly. At the same time the study of compound mineral admixtures which used in concrete, become a very important part of it. To develop a new kind of mineral compound which can satisfied the development of mordant become a hot topic in the studying field of Portland cement.This thesis is a study about mineral compound with steel slag powder, blast furnace slag powder and fly ash, and to take part of cement, making concrete. Study concrete strength and long time durability of the concrete making with this kind of material. And there are same conclusions as follow.Study the relations between concrete strength and the ratio of compound mineral admixtures. And found that the water reducer used for 1.6%, the water cement ratio between 0.39 ~ 0.42, the compound mineral admixtures to take cement ratio 30% is best for the concrete strength. In the compound mineral admixtures steel slag, bounce power and fly ash under proportion of 1:2:1 is best.By concrete chloride ion permeation test, it is shows that the age and the use of mineral admixtures quantity have significantly effect to the concrete strength. With increasing the quantity of mineral admixtures, the quantity of concrete anti chloride ion permeation ability has serious improved. And to test the concrete's anti chloride ion permeation ability, it is proper to common concrete use 28 day as its age, and 45 days as the evaluation age of compound mineral admixtures is reasonable.Also study the carbonization of the concrete with compound mineral admixtures. It is clear that the anti carbonization ability of common concrete is better than concrete with compound mineral admixtures, and the better proportion of admixtures is 30%, the more compound mineral admixtures use the worse of concrete anti carbonization.The test result of concrete anti water permeation shows that the concrete with compound mineral admixtures is better than common concrete. And when the admixtures proportion is 50% will be better. From corrosion test studied the compound mineral admixtures how to affect concrete anti salts corrosion ability. When the replace ratio is 40%, the proportion of compound mineral admixtures is 1:1:1, it is have a good ability to anti salts corrosion.