Influence of fly ash on slump loss and strength of concrete fully incorporating recycled concrete aggregates

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Author list: Tangchirapat W., Rattanashotinunt C., Buranasing R., Jaturapitakkul C.

Publisher: American Society of Civil Engineers

Publication year: 2013

Journal: Journal of Materials in Civil Engineering (0899-1561)

Volume number: 25

Issue number: 2

Start page: 243

End page: 251

Number of pages: 9

ISSN: 0899-1561

eISSN: 1943-5533

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84879599804&doi=10.1061%2f%28ASCE%29MT.1943-5533.0000585&partnerID=40&md5=3cdd4e4951fa879d9460a451ff61cb89

Languages: English-Great Britain (EN-GB)

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Abstract

This paper investigates the effects of fineness and replacement of fly ash on the fresh and hardened properties of recycled aggregate concrete. Two groups of recycled aggregate concretes were studied and compared with that of conventional concrete (CON) in which crushed limestone and local river sand were used as aggregates. The first group was prepared using 100% coarse recycled concrete aggregate and local river sand. For the second group, crushed limestone and local river sand were fully replaced by both coarse and fine recycled concrete aggregates. The results indicate that the slump loss of the recycled aggregate concrete with fly ash was reduced to lower than that of the recycled aggregate concrete without fly ash when the fineness of the fly ash was increased, which increased the slump loss of the fresh concrete. Fly ash can be used to increase the compressive strength of recycled aggregate concrete, depending on its fineness and the degree of fly ash replacement. The addition of fly ash with different fineness in recycled aggregate concrete had no significant effect on the splitting tensile strength and the modulus of elasticity of the recycled aggregate concrete, which are related to its compressive strength. ฉ 2013 American Society of Civil Engineers.

Keywords

Recycled concrete aggregate, Slump loss, Splitting tensile strength