A TRIAL OF REDUCING AUTOGENOUS SHRINKAGE BY RECYCLED AGGREGATE

A possibility of reducing autogenous shrinkage by recycled aggregate which is much more absorbable than normal aggregate is investigated. Autogenous shrinkage as well as self-induced stress of recycled concrete with water to cement ratio of 0.25 is compared with those of companion normal concrete experimentally. The experiment shows that recycled aggregate is effective in reducing the autogenous shrinkage as well as its induced stress, while shrinkage strain of recycled concrete after exposed to the air is more significant than that of normal concrete.

研究了利用比普通骨料吸水性强得多的再生骨料来降低自收缩的可能性。通过实验，将水灰比为0.25的再生混凝土的自收缩以及自诱导应力与相应的普通混凝土进行了比较。实验表明，再生骨料在降低自收缩及其诱导应力方面是有效的，然而暴露在空气中后，再生混凝土的收缩应变比普通混凝土更为显著。