AI Article Synopsis
- * Researchers tested various additives—expansion agent (EA), shrinkage-reducing agent (SRA), and superabsorbent polymer (SAP)—to optimize hydration heat and shrinkage in concrete for different construction needs.
- * While the expansion agent increases hydration and heat release, the shrinkage-reducing agent significantly lowers shrinkage by 79%, although it compromises strength; the study offers insights into effectively combining these components for better concrete performance in tunnel engineering.
Article Abstract
Secondary lining concrete is frequently used in underground tunnels. Due to the internal restriction of the annular concrete segment, micro-cracks may be caused by temperature stress and volume deformation, thus affecting the safe transportation of the tunnel. The purpose of this study is to provide a concrete experimental basis with low hydration heat and low shrinkage for tunnel engineering with different construction requirements. Different amounts of expansion agent (EA), shrinkage-reducing agent (SRA), and superabsorbent polymer (SAP) were considered in commercial concrete. It was found that EA elevated the degree of hydration and the hydration exothermic rate, while SRA and SAP showed the opposite regularity. SRA has the optimum shrinkage reduction performance with a 79% reduction in shrinkage, but the strength decreases significantly compared to EA and SAP groups. The effect of the combination of different shrinkage reducing components in commercial concrete is instructive for the hydration rate and shrinkage compensation in secondary lining engineering.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9572792 | PMC |
| http://dx.doi.org/10.3390/ma15196848 | DOI Listing |
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