TY - JOUR AU - Marish Sabiniano Madlangbayan, AU - Jeza Mae Monocay AvendaƱo, AU - Kim Fuentes Prodigalidad, AU - Milagros Momongan Peralta, AU - Ronaniel Almero Almeda, AU - Engelbert Kasilag Peralta, AU - Marloe Baclayon Sundo, AU - Maricel Aquino Eneria, PY - 2020/11/28 Y2 - 2024/03/29 TI - EFFECT OF NANOSILICA ON THE STRENGTH OF CONCRETE WITH VOLCANIC PUMICE AS COARSE AGGREGATES JF - GEOMATE Journal JA - INTERNATIONAL JOURNAL OF GEOMATE VL - 19 IS - 75 SE - Articles DO - UR - https://geomatejournal.com/geomate/article/view/1126 SP - 50-57 AB - <p>The use of concrete with volcanic pumice as aggregate is limited to masonry. The main reason <br>for its limited utilization is that when volcanic pumice is used as a coarse aggregate in concrete, the result leads <br>to poor performance. Such poor performance is attributed to the weak mechanical properties of volcanic pumice. <br>Past research works show that the use of a stronger mortar counteracts the poor mechanical properties of <br>lightweight aggregate. In this study, the mortar phase of Volcanic Pumice Concrete (VPC) was improved<br>through the incorporation of amorphous nanosilica synthesized from rice hull ash. Nanosilica was admixed in <br>VPC at a concentration of 0.5% by weight of cement. Cylindrical test specimens were prepared, cured for 7, <br>14, and 28 days, and subjected to compressive and splitting tensile strength tests. Test results show that VPC <br>specimens with 0.5% nanosilica have higher compressive and splitting tensile strength for all cases of 7, 14, <br>and 28 days curing time compared to specimens without nanosilica. The highest percentage increase in <br>compressive and splitting tensile strength was observed in specimens cured for seven days.</p> ER -