Currently C939 only allows testing of mixtures using the mixer shown in Fig. 1 of C938. It is felt that allowance should be made to mix the trial batches according to project specifications and equipment with the C938 mixer still to be used if no specifications exist. Concurrent to the ballot change wording is being proposed for C938 and C937 to harmonize this change.
Keywordsflow cone; grout; preplaced-aggregate concrete; time of efflux; Consistency--concrete; Efflux--hydraulic cement grout; Field testing--concrete/aggregates; Flow and flow rate--cement/concrete; Grouts (preplaced-aggregate (PA) concrete); Preplaced-aggregate (PA) concrete; Time of efflux; Viscosity;