THE INFLUENCE OF SILICA FUME ON THE DRYING SHRINKAGE OF FIBER CEMENT REINFORCED WITH PVA FIBERS

摘要

The main purpose of this paper is to study the influence of silica fume on the drying shrinkage and flexural resistance of fiber cements produced by the Hatscheck process. Samples of fiber cement reinforced with PVA and cellulose fibers were tested with two different compositions, one sample with silica fume and the other without silica fume. Two test series were performed: shrinkage and flexural resistance were measured. In spite of the change in formulation happening just in the cementitious matrix, there were no changes of LOP and E of the composite. However, the results of MOR of the composite with silica fume were larger than for the other composite. The fiber cement with silica fume presented greater shrinkage than the other, for the same mass loss. That occurred due to the refinement of pores brought about by the addition of silica fume, measured for MIP.