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Guidelines for mix proportioning of fly ash/GGBS based alkali activated concretes

Open access
Rafeet, Ali, Vinai, Raffaele, Soutsos, Marios, Sha, Wei·2017·Construction and Building Materials

Abstract

Abstract The effects of paste volume, water content and precursor blend on consistency, setting time and compressive strength of alkali activated concrete (AAC) produced with fly ash (FA) and ground granulated blast furnace slag (GGBS) have been investigated with the aim of developing a suitable mix design procedure. Paste volumes in the range 30–33% were found not to influence the compressive strength but did influence the consistency of the mixes. The water-to-solid ratio was found to influence compressive strength and setting time. Increasing GGBS content in the binder blend resulted in an increase of the compressive strength, but higher GGBS content caused also early setting which may be undesirable. A mix design procedure has been developed and has been used to determine the constituent mix proportions for three classes of concretes, i.e. (a) a ready-mix concrete with nominal strength 35 MPa, (b) a typical structural concrete with nominal strength 50 MPa, and (c) a high strength concrete for precast applications with nominal strength 70 MPa. Cost analysis was carried out to compare the AAC with Portland cement concretes with similar properties. Normal strength Portland cement concrete (PC), as typically used in ready mix industry has been shown to be less expensive than AAC. However, alkali activated concrete can be competitively priced for high strength concretes. An empirical step-by-step procedure is presented for selecting trial mix proportions for concretes with a range of consistency values, setting times and cube compressive strengths.

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Metadata

Authors
Rafeet, A., Vinai, R., Soutsos, M., & Sha, W.
Venue
Construction and Building Materials
Publisher
Elsevier BV
Published
2017-08
Volume
147
Pages
130-142
ISSN
0950-0618 (ISSN-L)
OpenAlex
W2609530344
Cited by
258
References
24
FWCI
11.99
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Guidelines for mix proportioning of fly ash/GGBS based alkali activated concretes. https://app.cochat.ai/papers/10.1016/j.conbuildmat.2017.04.036
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Rafeet, A., Vinai, R., Soutsos, M., & Sha, W. (2017). Guidelines for mix proportioning of fly ash/GGBS based alkali activated concretes. Construction and Building Materials. https://doi.org/10.1016/j.conbuildmat.2017.04.036

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