Study on Dry-Shrinkage Properties of Layer Hybrid Fiber Reinforced Concrete

Abstract

In order to study the effects of the application of layer steel fibers and polypropylene fibers on dry-shrinkage properties of concrete, the contrast experiments on the dry-shrinkage ratio and mass-loss ratio of ordinary concrete(OC), layer steel fiber reinforced concrete(LSFRC) and layer hybrid fiber reinforced concrete(LHFRC) under constant temperature (20±2°C) and constant humidity(relative humidity 60±5%) condition were carried out. The dry-shrinkage ratio of LHFRC is smaller obviously than OC’s and LSFRC’s, and achieve a reduction of 26.9%, the dry-shrinkage ratio of LHFRC after adding grinding slag and fly ash achieve a reduction of 40.2% at the age of 180 days. However, the mass-loss of LHFRC is larger than OC’s, and achieve an increment of 18.3% at the age of 180 days, LHFRC after adding grinding slag and fly ash’s is consistent with OC’s. The dry-shrinkage properties of concrete will be improved remarkably by adding layer hybrid fiber.