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首页> 外文会议>International Workshop on Durability and Sustainability of Concrete Structures >USE OF RECYCLED AGGREGATE AND EXPANDED CLAY FOR SELF-COMPACTING LIGHTWEIGHT AGGREGATE CONCRETES
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USE OF RECYCLED AGGREGATE AND EXPANDED CLAY FOR SELF-COMPACTING LIGHTWEIGHT AGGREGATE CONCRETES

机译：使用回收的聚集体和扩展粘土进行自压式轻质聚集体混凝土

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In this work, fiber reinforced SCLWAC (self-compacting lightweight aggregate concrete) mixtures were studied, in which synthetic fibers were used. Eight different SCLWAC mixtures were prepared, by employing either fly ash or silica fume as mineral addition. In particular, as aggregates, different combinations of fine and coarse expanded clay were tried, also partially replaced by either quartz sand or recycled aggregate coming from a recycling plant, in which rubble from concrete demolition are suitably treated. The SCLWACs were characterized at the fresh state by means of slump flow, V-funnel and L-box tests, and after hardening by means of compression, splitting tension and bending tests, as well as drying shrinkage measurements. Strength class of LC 45/50 was obtained by using synthetic macrofibres when the oven dry density of SCLWAC was about 1600 kg/m`3 [2700 lb/yd~3], while if the oven dry density of SCLWAC was lower than 1250 kg/m~3 [2100 lb/yd~3] a strength class of LC 25/28 was reached as well. Splitting tensile and flexural strength measured values were consistent with concrete strength class, while the elastic modulus was quite low with respect to normal weight self-compacting concrete (SCC). The post-cracking behaviour of SCLWAC resulted strongly improved by the addition of synthetic macrofibers, which proved to guarantee a softening behaviour in flexure. In conclusion, the addition of synthetic fibers allowed to design special concretes with excellent combination of mechanical and functional properties.
机译：在这项工作中，纤维增强SCLWAC（自密实轻骨料混凝土）的混合物进行了研究，其中使用的合成纤维。制备八种不同SCLWAC混合物，通过采用任一飞灰或硅灰作为矿物添加。特别是，作为聚集体，细的不同组合和粗膨胀粘土进行了尝试，也部分地由任一石英砂替换或再生骨料从回收工厂，其中来自混凝土拆除瓦砾被适当地处理的到来。通过坍落流动，V-漏斗和L-箱测试中，并借助于压缩，分割张力和弯曲试验，以及干燥收缩测量来硬化后的SCLWACs表征在新鲜状态。通过使用合成macrofibres获得强度等级LC 45/50的当SCLWAC的绝干密度为约1600千克/ m`3 [2700磅/码〜3]，而如果SCLWAC的烘箱干密度低于1250公斤/米〜3 [2100磅/码〜3]一个强度等级LC 25/28的达到为好。分裂拉伸强度和弯曲强度的测定值分别为与混凝土强度等级相一致，而弹性模量是相当低的相对于正常体重自密实混凝土（SCC）。 SCLWAC的后开裂行为导致强烈的通过添加合成粗纤维，这证明保证弯曲软化行为的改善。总之，在加入合成纤维允许机械特性和功能特性的优秀的组合来设计特殊混凝土。

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