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中文摘要：
采用混凝土流变仪研究了合成纤维直径、长度、截面形状、表面特征、掺量等参数对砂浆流变行为的影响机制.结果表明：减小纤维直径以及增加纤维掺量导致砂浆屈服应力和塑性粘度显著增大,而增加纤维长度主要影响屈服应力.异形截面纤维增大了纤维与浆体间接触面积和摩擦作用,导致浆体流变性能变差,而纤维表面含油剂导致砂浆含气量显著增加.纤维对砂浆流变行为的影响与其引气作用密切相关,通过掺入消泡剂消除多余气泡可减小纤维对砂浆流变性能的负面影响.
英文摘要：
The effect of diameter, length, cross section shape, surface treatment and dosage of synthetic fibers on rheological behavior of mortar was studied by using a rheometer for mortar and concrete. Results show that a significant increase of yield stress and plastic viscosity was decreased with fiber diameter and increased with fiber dosage. The yield stress of mortar was also influenced by fiber length and a worse rheological behavior was observed when introducing fiber with non-circular cross section due to the increased contact area and fi＇iction. Furthermore, a significant increase of air content was obtained with fiber surface treating with oil. The change in rheological behavior of mortar was mainly controlled by the increased air content following the introduction of fiber. Therefore, the rheological behavior of mortar reinforced by fiber could be improved by defoaming agent.
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