Correlation of the Initial Absorption Coefficient and the Compression Resistance of Concrete Blocks (Vibro-Compacted), with the Addition of Fly Ash and an Additive

In this research, the assessment is reported that between the initial absorption and the compressive strengthCompressive strength of concrete blocks (vibro-compactedVibro-compacted); the correlationsCorrelation are compared with a standard, which presents, after 28 days of manufacturing, a resistance to the compression of 96.08 kg/cm2 and an initial absorption coefficientInitial absorption coefficient of 21.4 g/(cm2 × min0.5), which was compared with three different mixtures of fly ashFly ash and an additiveAdditive: The first was added with 10% of fly ashFly ash less 5% cement which presents a compressive strengthCompressive strength of 83.32 kg/cm2 and an initial absorption coefficientInitial absorption coefficient of 19.72 g/(cm2 × min0.5), the second the additiveAdditive was added which present, a compressive strengthCompressive strength of 81.63 kg/cm2 and an initial absorption coefficientInitial absorption coefficient of 19.42 g/(cm2 × min0.5), and the last sample was added 10% of fly ashFly ash plus the additiveAdditive which present a compressive strengthCompressive strength of 97.51 kg/cm2 and an initial absorption coefficientInitial absorption coefficient of 7.51 g/(cm2 × min0.5). The resistance values in all cases are acceptable for the ONNCCE regulations; however, only the sample with the addition of fly ashFly ash plus the additiveAdditive considerably decreases the initial absorption coefficientInitial absorption coefficient. The ONNCCE regulations were followed when performing the physical examinations. Scanning electron microscopy, X-ray diffractionX-ray diffraction (XRD), and a laser particle analyzer were used to characterize the fly ashFly ash.