This study presents the effect of curing conditions towards properties of lightweight concrete brick made up of cement, sand and some replacement materials. The replacement materials used in this study is Expanded Polystyrene (EPS) as sand replacement and Palm Oil Fuel Ash (POFA) as cement replacement. The percentage of replacement for POFA is 0%, 10% and 20% whilst 0%, 30% and 50% for EPS. The brick samples have been exposed to different types of curing conditions that is air curing and water curing until the day of test. Among the tests that have been conducted are hardened brick density, compressive strength and water absorption. Based on the findings, it has been proved that the replacement percentage of EPS and POFA has significant impacts towards the brick properties. In addition, it is found that hardened brick density and compressive strength of air curing samples are lower as compared to water curing samples meanwhile the water absorption for air curing samples are higher that water curing samples.

This paper assesses the mechanical properties of cement brick containing Expanded Polystyrene Beads (EPS) and Palm Oil Fuel Ash (POFA) as partial replacement of sand and Ordinary Portland Cement (OPC). The aim of this research are to determine the mechanical properties of brick containing EPS and POFA as partial replacement of sand and OPC. The dosage for EPS replacement is 20%, 30%, 40% and 50% EPS whereas 5%, 10%, 15%, 20% and 25% of POFA replacement. The mechanical properties of the bricks are density, compressive strength and water absorption. The bricks with 30%, 40% and 50% EPS replacement have density below 1680 kg/m 3 which considered as lightweight brick. The brick with 50% EPS replacement recorded lowest density which is 1328 kg/m 3 while 1629 kg/m 3 for the brick with 25% POFA replacement at 56-days of curing. The water absorption testing for these brick are between 7.20%-18.19%. Brick with 0% POFA and 50% EPS replacement has the lowest water absorption properties whereas brick with 25% POFA and 0% EPS replacement has the highest water absorption properties.

Bricks are considered as important and strongest materials being used over the years. Commonly, bricks are made of clay mineral and usually used in construction of building wall. The purpose of this study is to assess the effectiveness of palm oil fuel ash (POFA) and expanded polystyrene beads (EPS) as a brick and its suitability as sound absorption material. POFA is used as partial replacement of cement while EPS as partial replacement of sand in the mortar mixture. Various percentages of EPS and POFA have been used which include 0%, 20%, 30%, 40% and 50% as sand replacement and from 0%, 5%, 10%, 15%, 20% and 25% as cement replacement respectively. Sound absorption tests were conducted using impedance tube. From this study, it has been identified that for sound absorption test, lowest result recorded is at maximum 25% POFA replacement with 50% EPS replacement with 0.011 sound absorption coefficient at frequency of 3500 Hz. The best sound absorption coefficient recorded is 0.998 at frequency of 250 Hz for sample with 0% EPS and 20% POFA replacement. It can be recognized that the brick produced have the excellent sound absorption.

Abstract. This paper assesses a new design of recycled concrete aggregates as an aerated filter for removal of phosphorus (P). Recycled concrete aggregates (RCA) obtained from crushed concrete waste. In this study, RCA is used as an Aerated Filter for removal of P. A commercial concrete was crushed, and the RCA were sieving according to different sieve size. The highest percentage passing sieve size is size 5 mm is 99.88%. The bulk density for RCA is 1680 kg/m 3 while percentage of voids is 36%. Result for water absorption test of RCA is 1.27, the Aggregate Impact Value (AIV) test is 28.75 and the pH value for RCA is 9.30 which is alkaline. RCA with smallest size and lowest initial concentration of P which is 0mm to 5mm and 10mg/L respectively has the lowest uptake capacity which 0.996 mgL -1 /g but highest percentage of P removal which 99.60%.Besides cost saving, due to application of water material, the usage of RCA will ease the environmental problems that are currently perceived globally. RCA could also saves landfill space which helps reduce the needs for gravel mining and reduces pollution.