Arellano, Aaron A.  <br/><br/>
Comparative study on the compressive strength of concretes with eggshells and seashells powder as partial replacement to cement / 
Aaron A. Arellano  
 - City of Batac :  MMSU,   2024. 
 - xiii, 52 leaves :  29 cm.  
<br/><br/> UTHESIS (Bachelor of Science in Ceramic Engineering) 
<br/><br/>Bibliography : leaves 34-37 
<br/><br/> This thesis compared the potential of utilizing powdered eggshells (PES) and <br/>powdered seashells (PSS) as partial replacement materials for cement to enhance the <br/>compressive strength of concrete. The primary focus of this research is evaluating the <br/>compressive strength of concrete with 18%, 20%, and 22% of PES and PSS denoted us <br/>FE1-3 and FS1-3 respectively, all cured in 7, 14, and 28 days. Notably, the PES <br/>formulation attains its highest compressive strength at FE3, reaching 6.8MPa within 14 <br/>days, while the PSS achieves 9.7MPa in the FS1, within 28 days. To assess the <br/>suitability of these mixtures for practical applications, the study compares the obtained <br/>strengths to the standard requirement for concrete design, which is M20 grade (20 <br/>MPa). Although FE and FS formulation did not achieve the standard strength of a <br/>conventional concrete, the results showed that PSS is a better alternative and <br/>recommended for optimization study. In summary, this thesis provided valuable <br/>insights into the use of PES and PSS as cement replacements, highlighting their positive <br/>impact on concrete compressive strength and their conformity to industry standards. <br/>These findings contribute to sustainable and cost-effective construction practices.