期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 299, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2021.124286
关键词
Alum sludge ash; Advanced nanoindentation technique; Selective dissolution method; Value-added recycling
资金
- UniSA
- Australian Research Council (ARC)
- ARC Research Hub for Nanoscience-based Construction Material Manufacturing [IH150100006]
- South Australia Water Corporation [SW100495]
- Industrial Transformation Training Centre (TTC) scheme [IC180100005]
- SA Water
The study investigated the use of alum sludge ash (ASA) in cement-based composites, with varying percentages of 0%, 10%, 20%, and 30%. Results showed that the paste samples with 10% ASA exhibited higher pozzolanic reaction degree and homogenized indentation properties compared to those with 30% ASA. Excessive unreacted ASA may lead to a deterioration in the mechanical performance of the binder pastes.
The use of alum sludge ash (ASA) in cement-based composites was investigated in this study, where the cement was replaced by ASA at weight percentages of 0 %, 10 %, 20 %, and 30 %. The results obtained from an advanced nanoindentation technology (coupling conventional statistic nanoindentation and chemical mapping) exhibited that the indentation modulus and hardness of High-density (HD) C-S-H and Low-density (LD) C-S-H as well as the total volumes of C-S-H gel in ASA-incorporated binder pastes were similar. However, the volume fractions of HD C-S-H in the pastes with 10 % ASA were higher than that in 30 % ASA samples. These results might attribute to the fact that the pastes containing 10% ASA exhibited a higher pozzolanic reaction degree, which was determined using the selective dissolution method. The homogenized indentation properties of paste samples with 10 % ASA were also higher than those incorporating 30 % ASA. In addition to considering HD C-S-H gel volume, the increased amount of unreacted ASA with much lower indentation properties than those of cement clinker might result in a deteriorated mechanical performance of binder pastes. In actual engineering practice, the optimum ratio for cement replaced with ASA in concrete was 10 %, which led to a comparable strength to concrete block samples containing 0 % ASA.
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