, News Bits, Volume III, Issue 7, July-December 2006
The study aimed to evaluate the structural performance of concrete blocks that utilized coal combustion by-products from the Calaca Coal-Fired Thermal Power Plant as partial replacement for cement and sand. It aimed to develop a concrete mix design that would meet the concrete block standard compressive strength (Non-Load Bearing Concrete Hollow Block and Interlocking Paving Block) per PNS and ASTM.
A number of experiments were carried out to realize the objectives of this research. Different tests of the product were conducted to conform to the standards cited earlier such as physical property test of aggregate and mechanical properties of fresh concrete. Sample concrete specimens with different designs mixes were developed and compared to the concrete block compressive strength standard set by the Philippine National Standard (PNS) and American Society for Testing and Materials (ASTM).
The physical properties (gradation, specific gravity, etc.) of the bottom ash and fly ash used as substitute construction materials for making concrete blocks were evaluated and compared with the standards used. Results showed that bottom and fly ashes were both beneficial and could be used as construction materials.
The mechanical properties (compressive strength) of concrete were evaluated and compared with the aforementioned standard. Results showed that some mix designs satisfied the ASTM-PNS standards on the compressive strength of concrete.
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