US EPA

6340059 

Journal Article 

PFA concrete mix design for the 1990s 

Hughes, BP; Al-Ani, MNA 

1991 

Yes 

Cement and Concrete Composites
ISSN: 0958-9465 

13 

3 

187-195 

http://www.sciencedirect.com/science/article/pii/095894659190019E
Exit
 

Mix design facilitates the economical use of available materials to provide a concrete with certain desirable characteristics. Mix design for pulverized fuel ash (PFA) concrete should therefore be no exception. The relevant properties of economically available PFAs should be assessed together with those for the aggregates and cement and a suitable concrete designed for the required criteria for quality (e.g. strength) and for workability (e.g. Vebe time). This paper describes the properties which should be assessed for the various constituents, including the PFA, to facilitate the rational design of PFA concrete. The actual design process is illustrated in the form of charts to describe the principles although the method also clearly lends itself to rapid application in practice in the form of a computer program. The properties of the constituents which should be known include the volume size distribution (e.g. a laser technique analysis) and the relative density (RD) of the PFA, the specific surface and RD of the cement, the sieve analysis, angularity and RD for both the coarse and the fine aggregates, the loose bulk density of the coarse aggregate and the volume (if any) of entrained air. In addition, if cube strength is the criterion for quality, then the variation in cube strength with the ratio of cementitious material (cement plus PFA) to water, by volume, should also be known for the given cement, PFA and maturity conditions. 

Fly ash concrete; mix design; compressive strength; workability; concrete aggregates; design charts; sieve analysis; strength of materials