Eclipse(Trade Name) Shrinkage Reducing Admixture Product Evaluation

摘要

The use of Eclipse Shrinkage Reducing Admixture was investigated in this study in concrete mixtures for bridge deck parapets. Based upon in-service performance results, Eclipse reduced concrete shrinkage cracking in both the short and long term. Many shrinkage cracks that extended the full height of the parapet were noted in control sections, while only three such cracks were recorded in the Eclipse test section. Laboratory test results indicated that Eclipse concrete had approximately 14 percent less length change due to shrinkage at 56 days. There was little difference in compressive strength between mixes with and without Eclipse. Problems were encountered achieving air void levels in the concrete at the batch plant. The air content for the constructed Eclipse test section was 5.4 percent, on the lower side of the 6.0 + or = 1.5 percent target. Two subsequent batches were discarded due to inability to achieve acceptable air contents in the concrete when the Eclipse product was incorporated into the mix. Because of this difficulty, several other planned test sections were abandoned. Due to its tendencies to destabilize air void contents in the concrete mix, Eclipse Shrinkage Reducing Admixture is not recommended for use in reduction of shrinkage cracking in WisDOT concrete construction.