CAJ | 학술논문

通过不同PVA纤维体积率在3d、7d、14d、28d、56d、90d及120d龄期的立方体抗压强度试验，得到纤维体积率和龄期对PVA纤维增强水泥基复合材料立方体抗压强度变化规律的影响并建立了预测模型。结果表明， PVA纤维的掺入不能增加立方体的抗压强度，但可以提高抗压强度前期的增长速率，增强前期强度,弥补了粉煤灰的掺入导致PVA- FRCC立方体抗压强度前期不足的缺陷。并且，PVA纤维具有阻裂作用。龄期影响着抗压强度的增长速率在整个过程中的变化。所建立的PVA纤维增强水泥基复合材料立方体抗压强度预测模型，拟合优度较好，误差较小，并具有收敛性，符合PVA纤维增强水泥基复合材料抗压强度的发展规律。
통과불동PVA섬유체적솔재3d、7d、14d、28d、56d、90d급120d령기적립방체항압강도시험，득도섬유체적솔화령기대PVA섬유증강수니기복합재료립방체항압강도변화규률적영향병건립료예측모형。결과표명， PVA섬유적참입불능증가립방체적항압강도，단가이제고항압강도전기적증장속솔，증강전기강도,미보료분매회적참입도치PVA- FRCC립방체항압강도전기불족적결함。병차，PVA섬유구유조렬작용。령기영향착항압강도적증장속솔재정개과정중적변화。소건립적PVA섬유증강수니기복합재료립방체항압강도예측모형，의합우도교호，오차교소，병구유수렴성，부합PVA섬유증강수니기복합재료항압강도적발전규률。
The compressive strengths of PVA fiber reinforced cement-based composites (PVA- FRCC) cube speci-mens with different fiber volume rate in the ages of 3d, 7d, 14d, 28d, 56d, 90d and 120d are carried out to study the influ-ence law of fiber volume rate and ages on the compressive strength of the specimens, and the prediction models are estab-lished. The results show that the addition of PVA fiber can’t improve the compressive strengths of the PVA - FRCC cube specimens, but it can improve the growth rate of compressive strengths of the PVA - FRCC cube specimens in the early stage, meanwhile, adding fly ash can make up for the compressive strength deficiency of the PVA- FRCC cube specimens in the early stage. In addition, PVA fiber has the crack resistance effect. Ages affect growth rate changes of compressive strengths of the PVA - FRCC cube specimens during the whole process. The established model has goodness of fit, small errors and convergence, and the results from forecasting model conform to the development law of compressive strengths of the PVA- FRCC cube specimens.