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 flexuralrnresistance of fiber cements produced by the Hatscheck process. Samples of fiber cement reinforced withrnPVA and cellulose fibers were tested with two different compositions, one sample with silica fume and thernother without silica fume. Two test series were performed: shrinkage and flexural resistance were measured.rnIn spite of the change in formulation happening just in the cementitious matrix, there were no changes ofrnLOP and E of the composite. However, the results of MOR of the composite with silica fume were largerrnthan for the other composite. The fiber cement with silica fume presented greater shrinkage than the other,rnfor the same mass loss. That occurred due to the refinement of pores brought about by the addition of silicarnfume, measured for MIP.