| 摘要 |
A METHOD AND APPARATUS FOR FORMING A CONCRETE BLOCK, PARTICULARLY BUT NIT EXCLUSIVELY A COMPOSITE BLOCK WITH A REFLECTIVE FACIA PORTION. THE BLOCK SI FORMED BY A DRY-CAST TECHNIQUE, IN WHICH MIXTURE FOR FORMING THE BLOCK HAS A WATER/CEMENT RATIO LESS THAN OR EQUAL TO 0.35, IN COMBINATION WITH APPLICATION OF A COMPACTION FORCE SO THAT THE RESULTANT BLOCK COMPLIES WITH COMPRESSIVE STRENGTH REQUIREMENTS SET OUT IN BS 6717: PART 1: 1993. |
