@article{Saengsuree Pangdaeng_Vanchai Sata_Prinya Chindaprasirt_2018, title={EFFECT OF SODIUM HYDROXIDE CONCENTRATION AND SODIUM SILICATE TO SODIUM HYDROXIDE RATIO ON PROPERTIES OF CALCINED KAOLIN-WHITE PORTLAND CEMENT GEOPOLYMER}, volume={14}, url={https://geomatejournal.com/geomate/article/view/2888}, abstractNote={<p>This study presents the effects of sodium hydroxide concentration (NH) and sodium silicate to<br>sodium hydroxide ratio (NS/NH) on the mechanical properties and microstructure of geopolymer pastes<br>prepared from calcined kaolin (CK) and white Portland cement (WPC). Different curing conditions viz.,<br>ambient curing, temperature curing, and moist curing were used. The results indicated the increasing NH<br>concentration and NS/NH ratio increased the compressive strength of CK-WPC geopolymers and gave the<br>highest compressive strength at NH concentration of 15 molar and NS/NH ratio of 1.0. Furthermore, the use<br>of 50% WPC increased the compressive strength of geopolymer paste. The samples with ambient temperature<br>curing showed high early compressive strength equal to that with temperature curing. For moist curing, the<br>compressive strengths of WPC samples at the later age were continuously developed and were higher than<br>those with ambient and temperature curings. The microstructures of geopolymer paste were tested using SEM<br>images and pattern of XRD (X-ray diffractometer) which showed the denser paste and higher calcium<br>compound in the CK-WPC samples than those in CK samples.<br><br></p>}, number={46}, journal={GEOMATE Journal}, author={Saengsuree Pangdaeng and Vanchai Sata and Prinya Chindaprasirt}, year={2018}, month={Feb.}, pages={121–128} }