TY - JOUR AU - Carmela Denise Isberto, AU - Krystoffer Lloyd Labra, AU - Jan Marielle B. Landicho, AU - Richard De Jesus, PY - 2018/12/15 Y2 - 2024/03/29 TI - OPTIMIZED PREPARATION OF RICE HUSK ASH (RHA) AS A SUPPLEMENTARY CEMENTITIOUS MATERIAL JF - GEOMATE Journal JA - INTERNATIONAL JOURNAL OF GEOMATE VL - 16 IS - 57 SE - Articles DO - UR - https://geomatejournal.com/geomate/article/view/2810 SP - 56-61 AB - <p>For years, supplementary cementitious materials (SCM) has been extensively used as an integral <br>component in the production of concrete. This has been motivated by sustainability efforts and reduced <br>environmental impact. Correspondingly, this study intended to develop an appropriate method for the use of <br>rice husk ash (RHA), a by-product of rice husk (RH) which exists abundantly in the Philippines, as a partial <br>replacement to ordinary Portland cement (OPC). Different studies have suggested optimal percentage<br>replacement values of RHA, from 10% to 20%, which demonstrated vast improvement in strength of the <br>resulting blended concrete. These optimal values, however, immensely depends on the burning preparation of <br>RHA which adversely affects the amorphous silica components, and therefore the pozzolanic activities of RHA <br>in concrete. In this research, a potential approach to convert RH into optimized and highly reactive RHA by <br>controlled burning and grinding is provided. The effect of RHA in the strength of cement mortar was <br>investigated through the various proportions of 5, 10, 15, and 20% RHA by weight replacement of cement. <br>Some of the findings are: (i) controlled combustion of RH with temperature ranging from 400 to 600 °C and a <br>slow method of cooling for 6 to 8 hours were some of the critical factors needed to produce high silica content, <br>(ii) concrete containing up to 10% RHA replacement is optimal in maximizing the strength of cement mortar, <br>and (iii) the incorporation of RHA in concrete by 15% and 20% replacement by weight indicated a lower <br>workability.</p> ER -