PVA纤维混凝土弯折性能试验研究浅析

混凝土是一种脆性材料，其抗裂性能较差，在其中掺入合成纤维，可增加其韧性、提高早期和极限抗拉强度以及局部强度。本文利用正交原理，从现成的试验数据中挑选出具有代表性的数据。分别以初裂荷载、弯折抗拉、初裂挠度、极限荷载、极限抗拉、极限挠度为考核指标，对PVA纤维掺量和龄期等因素进行极差和方差分析。分析结果表明：无论哪种龄期，PVA纤维混凝土梁的韧性要比普通混凝土梁高，且随纤维含量的增加而增大；龄期对混凝土梁的韧性影响不明显。

Discussing experiments on bending of PVA fiber concrete beams

The concrete is a kind of brittle material and has poor crack resistance.With adding synthetic fiber into concrete,the toughness improves,and early tensile strength and utmost tensile strength enhance.The toughness of some important portions just like concrete frame joints enhance too.By utilizing orthogonal theory in this paper,we pick out some typical test-points from ready experiments data.The early cracking tensile strength,early bending tensile strength,early flexibility and utmost tensile strength,utmost bending tensile strength,utmost flexibility are examined.By using orthogonal theory we analylzed PVA fiber volume rations and concrete ages.The result indicates:the toughness of PVA fiber concrete beams is higher than common concrete in any concrete ages,and increasing with PVA fiber volume ratios increasing.When the concrete ages change,the toughness changing of PVA fiber concrete beams is not obvious.