https://ph01.tci-thaijo.org/index.php/html <p>The establishment of Thailand Concrete Association Journal (TCA Journal) was initiated by the Academic Committee of the Thailand Concrete Association with the objective to collect valuable papers which are results of researches or high-valued practices in the field of concrete.</p> en-US petevmi91@yahoo.com (Professor Grp. Cpt. Thanakorn Pheeraphan ) tcajournal@gmail.com (Professor Grp. Cpt. Thanakorn Pheeraphan ) Thu, 30 Mar 2023 00:00:00 +0700 OJS 3.3.0.8 http://blogs.law.harvard.edu/tech/rss 60 https://ph01.tci-thaijo.org/index.php/html/article/view/257181 <p>This research aims to use a high volume of fly ash partially replaced cement to produce the interlocking concrete blocks for floors according to TIS 827-2565. Fly ash was obtained from the electric thermal power plants, divided into 3 plants, namely NPS1, NPS2 and NPP5A. It partially replaced cement at 50, 60, and 70 percent by weight. The sand was used as the aggregate. The ratio of cementitious material (cement and fly ash) to aggregate was 1:2.5 by volume, adjusting the amount of water as appropriate. The samples were compressed with a hydraulic press. Compressive strength was investigated at 7 and 28 days. Water absorption was studied at 28 days. The results found that the strength index values ​​of fly ash at 28 days from NPS1, NPS2, and NP5A were 85.2%, 80.4%, and 72.4%, respectively. It has the properties of pozzolanic materials. The compressive strength decreases with increasing the percentage of fly ash replacement. The replacing 50 percent of fly ash by weight of NPS1 and NPS2 plants gave compressive strength values ​​of 46 and 51 MPa at 28 days. The compressive strength ​​passed in according to the TIS 827-2565 standard (more than 40.0 megapascals).</p> kiatsuda somna Copyright (c) 2024 Journal of Thailand Concrete Association https://creativecommons.org/licenses/by-nc-nd/4.0 https://ph01.tci-thaijo.org/index.php/html/article/view/257181 Thu, 30 Mar 2023 00:00:00 +0700 https://ph01.tci-thaijo.org/index.php/html/article/view/257772 <p>This research aims to study the acid-resistant property of geopolymer mortars containing glass waste. The river sand was replaced with glass waste at 0, 10, 20, 30, 40, 50, 60, 80 and 100% by volume. The test result was also compared with cement mortars containing glass waste. The sulfuric acid resistances were collected at 7, 14, 28, 56, 84, and 120 days. The test results showed that the sulfuric acid resistance slightly decreased with the increase in glass waste contents. However, the geopolymer mortar with 100% glass waste still exhibited better sulfuric acid resistance than that of Portland cement mortar as per ASTM C109/C109M. The glass waste could be applied in geopolymer mortar and concrete for the construction industry. The use of glass waste to produce geopolymer composite not only reduces Portland cement consumption but also reduces the environmental problems from waste glass.</p> Ampol Wongsa Copyright (c) 2024 Journal of Thailand Concrete Association https://creativecommons.org/licenses/by-nc-nd/4.0 https://ph01.tci-thaijo.org/index.php/html/article/view/257772 Fri, 31 Mar 2023 00:00:00 +0700