title: Experimental study on durability improvement of fly ash concrete with durability improving admixture.
abstract: In order to improve the durability of fly ash concrete, a series of experimental studies are carried out, where durability improving admixture is used to reduce drying shrinkage and improve freezing-thawing resistance. The effects of durability improving admixture, air content, water-binder ratio, and fly ash replacement ratio on the performance of fly ash concrete are discussed in this paper. The results show that by using durability improving admixture in nonair-entraining fly ash concrete, the compressive strength of fly ash concrete can be improved by 10%-20%, and the drying shrinkage is reduced by 60%. Carbonation resistance of concrete is roughly proportional to water-cement ratio regardless of water-binder ratio and fly ash replacement ratio. For the specimens cured in air for 2 weeks, the freezing-thawing resistance is improved. In addition, by making use of durability improving admixture, it is easier to control the air content and make fly ash concrete into nonair-entraining one. The quality of fly ash concrete is thereby optimized.
authors.affiliation: School of Architectural Engineering, Qingdao Agricultural University, Qingdao 266109, China.
authors.forename: Hong-zhu
authors.initials: HZ
authors.lastname: Quan
authors.affiliation: Japan Association for Building Research Promotion, Tokyo 108-0014, Japan.
authors.forename: Hideo
authors.initials: H
authors.lastname: Kasami
mesh_terms: D060729:Coal Ash / Q000737:chemistry*; D019245:Compressive Strength; D003252:Construction Materials / Q000032:analysis / Q000592:standards*; D004548:Elasticity; D013718:Tensile Strength
chemical_list: D060729:Coal Ash