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首页> 外文会议>RILEM Proceedings PRO 39; RILEM Symposium on Fibre-Reinforced Concretes(FRC) - BEFIB 2004 vol.1; 20040920-22; Varenna(IT) >SOME DURABILITY ASPECTS OF FIBER REINFORCED SELF-COMPACTING CONCRETE
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SOME DURABILITY ASPECTS OF FIBER REINFORCED SELF-COMPACTING CONCRETE

机译：纤维增强自密实混凝土的某些耐久性方面

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摘要

In order to produce thin pre-cast elements, a self-compacting concrete was prepared, showing both high mobility through narrow sections and high segregation resistance. When manufacturing these elements, homogenously dispersed steel fibers instead of ordinary steel reinforcing mesh were added to the concrete mixture at a dosage of 10% by weight of cement. An adequate concrete strength class was achieved with a water to cement ratio of 0.40 and the required resistance against segregation was obtained by adding a limestone powder to the mixture at a dosage of 16% by weight of cement. Compression and flexure tests were carried out up to 180 days of wet curing to assess the safety of these thin concrete elements. Moreover, some durability aspects were taken into consideration. Firstly, drying shrinkage tests were carried out for up to 180 days of exposure in a 50% relative humidity environment, in order to evaluate the contribution of steel fibers in counteracting the high concrete strains due to a low aggregate-cement ratio. Secondly, both carbonation and chloride penetration tests were carried out to assess the vulnerability to corrosion of steel fibers.
机译：为了生产薄的预制构件，制备了自密实混凝土，既显示出通过狭窄部分的高流动性，又显示出高的抗偏析性。当制造这些元件时，将均匀分散的钢纤维代替普通的钢增强网以水泥的10重量％的剂量添加到混凝土混合物中。水与水泥的比例为0.40时，可以达到足够的混凝土强度等级，并且通过将石灰石粉末以水泥的16％（重量）的比例添加到混合物中来获得所需的抗偏析性。在湿固化过程中进行了长达180天的压缩和弯曲测试，以评估这些薄混凝土构件的安全性。此外，还考虑了一些耐久性方面。首先，在50％相对湿度的环境中进行了长达180天的干燥收缩试验，以评估钢纤维在抵抗由于骨料水泥比低而引起的高混凝土应变方面的作用。其次，进行了碳化和氯化物渗透测试，以评估钢纤维耐腐蚀的能力。

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