STUDY ON ADDITION OF FLYASH IN THE SMALL HOLLOW CONCRETE BLOCK WITH LOW CEMENT-AGGREGATE RATIO

摘要

This paper studies on, using method of comparison, the relationship between compressive strength and replacement of cement, sand and both by flyash in concrete with cement - aggregate ratio(C/A) of 1/10. Results show that the compressive strength and the impermeability of concrete block are improved when suitable amount of flyash is added. The trial production shows that, the grade of the small hollow concrete block with 16 % flyash is raised from 75~#, which corresponds to the concrete mix proportion used in practice, to 100~#. The permeability of block reachs the level of S grade. And saving of cement and natural sand contents in block are 16% and 42% respectively.