关键词: 粘土砖粉;混凝土;干燥收缩;机理

Abstract: The shrinkage performance of C 35 pavement concrete with BSF admixture , the influence of BSF admixture on the shrinkage of concrete as well as the effect mechanism of brick powder , fly ash and granulated blast furnace slag ( GBFS) powder on the shrinkage of concrete were investigated .The results showed that:clay brick powder and fly ash could compensate the shrinkage of concrete slightly , and with the increase of dosage of these two kind of materials , the drop amplitude of concrete shrinkage rate increased.On the contrary, GBFS powder could aggravate the shrinkage of concrete .The shrinkage performance of C35 pavement concrete was attributed to the interaction of brick powder , fly ash and GBFS, composite admixture .For the concrete shrinkage , the microhole smaller than 10 nm played dominate role .

Key words: brick powder;concrete;dry shrinkage;mechanism