Concrete Compressive Strength Evaluation: Water from the Marikina River as Mixing Water and Rice Husk Ash and Coir Fibre as Admixture

Abstract

The water acquired from the Wawa Dam of the Marikina River was utilised as a portion in the mixing water, and the Rice Husk Ash, and Coir Fibre as admixtures in the experimental concrete samples. The aim of the study was to produce a concrete sample that would surpass the compressive strength of a standard concrete following the standards of a 1:2:3 cement, sand, and gravel ratio, and with a 1:1 water to cement ratio. The researchers had a total of 18 cylindrical concrete samples, wherein nine samples used the said admixtures and substitutes, which were labelled as the experimental samples, and another nine samples were made from the materials used in producing standard concrete, which were labelled as the controlled samples. The samples which followed the 7, 14, and 28- day curing periods were tested by the Universal Testing Machine. In conclusion, the 7, 14, and 28-day experimental samples failed to exceed the compressive strength of the controlled samples since the values of the 7, 14, and 28-day controlled samples were 10.32, 24.24, and 10.23 MPa, while the experimental samples were 7.73, 10.06, and 7.73 MPa respectively.