Quality Evaluation Study of Crushed Stone Powder by Fresh and Hardened Mortars Using as Parts of Fine Aggregates
By Y. Tsuji, T. Mano, F. Tomosawa and K. Yamamoto
Concrete Journal, Vol.48, No.4, Apr. 2010
- Synopsis
- Crushed stone powder is limited to what passes through a 150-micrometer sieve in which the by-product is separated and/or ground at the time of menufacturing of a crushed stone and/or a crushed sand by dry process in the plant. Such crushed stone poeder can be a promising material used for the purpose of increasing the qualities of concrete. Quality evalutation studies of crushed stone powder are reported in which study items are flow, air content, bleeding, setting and hardening time, and compressive strength. Mortar mix proportions are designed as ones of not only 8 cm slump concrete but also 18 cm slump concre te. Almost crushed stone powders which passes through a 150-micrometer sieve did not increase remarkably a unit content of water and the amount of bleeding of mortar was descreased with high water-cement ratio and small amount of finer part of mortar. Relationships between percent flow specified in JIS A 5041 (Crushed stone powder for concrete) and flow value of mortar are presented. Relationships between activity index in JIS A 5041 and compressive strength of mortar are also presented.
- Keywords:
- crushed stone powder, 150-micrometer sieve, mix design, fresh mortar, compressive strength, percent flow, activity index
