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The objective of this research was to study the properties of concrete containing aluminum powder instead of sand to produce lightweight concrete in the ratio of aluminum powder to replace sand, 0 to 20% by weight. The mixture ratio of Portland cement to fine aggregate to coarse aggregate was 1: 2: 4 and 10% of silica fume by weight of cement. The ratio of water to cement was 0.40. Study method, the limestone was sifted through a sieve No.3/4" and fine aggregate was sifted through a No. 15 sieve, aluminum powder was sifted through a No. 10 sieve. All ingredients, each size, were mixed with the concrete according to the specified ratio. The samplers were poured in a square shape mold size 10×10×10 cm, weighed and incubated in water for 7, 14 and 28 days. The results showed that concrete with aluminum powder produced air bubbles or voids in the concrete. This was caused by concrete containing aluminum powder reacted with water resulting in hydrogen gas production, which can be seen by the naked eyes. Compressive strength of concrete containing 5% aluminum powder had the highest compressive strength compared with the standard concrete block, Thai industrial standard TIS.57-1990 (Class A). The compressive strength was not less than 14 MPa or approximately 140 kg/cm2 was used to test. It was found that the samples of concrete with 5% aluminum powder (formula A-2) passed the test with the result of 218.02 kg/cm2. Therefore, concrete with aluminum powder can be used as a substitute for sand. The suitable and usable weight of mixture ratio is concrete containing 5% aluminum powder.
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