| 摘要 |
PROBLEM TO BE SOLVED: To realize an ultra-low-shrinkage concrete having an excellent dry shrinkage performance of yielding a dry shrinkage of 1.5×10or below at a material age of 6 months.SOLUTION: Not only is limestone used as raw ingredients of both coarse and fine aggregates but an admixture having a viscosity of 10-200 mPa s (20°C) is also blended. High-purity limestone including at least 50% of a CaO component is used as the limestone. The unit quantity, in terms of solid content, of the admixture is confined to 10-30 kg/m. Portland cements such as ordinary cement, medium-heat cement, low-heat cement, etc. are used as cements. An expansive admixture is blended, and the binder-to-water ratio is confined to 1.54-3.33. |
