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Use of porous ceramic waste aggregates for internal curing of high-performance concrete

机译：多孔陶瓷废骨料在高性能混凝土内部固化中的应用

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Internal curing has become extensively used to reduce autogenous shrinkage and consequently mitigate the high risk of early age cracking of high-performance concrete (HPC). This paper investigates the efficiency of internal wet curing provided by a new type of aggregate, "recycled waste porous ceramic coarse aggregates" (PCCA). Six different silica fume HPCs with and without the PCCA are examined with respect to measured physical and mechanical property development. Four different replacement proportions of normal weight coarse aggregate (NCA) by the PCCA have been evaluated. The results have shown a high effectiveness of the PCCA for internal curing purposes, to drastically reduce and even to completely eliminate autogenous shrinkage of HPC prepared with a very low water/binder ratio (w/b) of 0.15. It has been found that the incorporation of 40 percent of the PCCA leads to a non-shrinking HPC that results in an insignificant internal stress accompanied by a significant increase of the compressive strength. It should be noted that for the different proportions of the PCCA incorporated no decrease of the compressive strength has been observed at either early or later ages, as is the case with some conventional lightweight aggregates.
机译：内部固化已广泛用于减少自发收缩，从而减轻了高性能混凝土（HPC）早期开裂的高风险。本文研究了新型骨料“再生废多孔陶瓷粗骨料”（PCCA）提供的内部湿固化的效率。相对于测得的物理和机械性能发展，研究了具有和不具有PCCA的六种不同的硅粉HPC。已评估了PCCA对正常重量粗骨料（NCA）的四种不同替代比例。结果表明，PCCA在内部固化方面具有很高的功效，可以极大地减少甚至完全消除以非常低的水/粘合剂比（w / b）0.15制备的HPC的自发收缩。业已发现，掺入40％的PCCA会导致HPC不会收缩，从而导致内部应力不明显，同时压缩强度也显着提高。应当指出的是，对于掺入的不同比例的PCCA，在早期或晚期时都未观察到抗压强度的降低，这与某些常规轻质骨料的情况一样。

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