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Figure 4–27: Electrical Resistance Measurements
Concrete Compressive Strength
The compressive strength of the three concrete mixtures is shown in Table 4­
50. The compressive strength of the mixtures was 2340 to 2535 psi at the age
of 28-days. A typical concrete used for foundations and walls construction has
a minimum specified 28-day compressive strength of 3000 to 4000 psi. The
concrete strengths achieved for the mixtures developed as part of this project
are below this usual strength level. The primary focus of this project was to
determine the effect of various materials on the electrical properties of the
concrete. Therefore, the compressive strength of the mixtures was considered
secondary at this stage of the study. Mixtures can be revised in future phases
to produce a higher strength material. The compressive strength of the
concrete may be increased by increasing the cementitious materials and/or
reducing the amount of water in the mixture (reducing the water to
cementitious materials ratio). This may also be achieved by using chemical
admixtures such as a mid-range or high-range water reducing admixture
(superplasticizer). The strength at various ages for these three mixtures is
quite similar due to the fact that the cementitious materials and water to
cementitious materials ratios are essentially the same.
121 We Energies
Coal Combustion Products
Utilization Handbook