MODIFIED DOE MIX DESIGN METHOD FOR HIGH-VOLUME FLY-ASH CONCRETES AND CONTROLLED LOW STRENGTH CONCRETES

On the basis of some fundamental principles for the design of fly ash concrete mixes,1,2 the Author proposes a number of modifications and e xtensions of the British DOE method for the 'Design of normal concrete mixes'. The suggested modifications make it possible to extend use of the DOE method to design of wet lean concretes and controlled low str ength materials (CLSM). The properties of both these types of concrete are considerably improved by the addition of high volumes of fly ash, but it requires some skill to design high volume fly ash concretes in a logical manner, so that they do show the optimum properties both in the fresh and the hardened state.