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Vol.49, No.5, 362 ~ 367, 2011
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| Title |
| Influence of Calcium on the Formation of Aluminosilicate Inorganic Polymer Binder |
| Sang Wook Ahn , Young Kue Choi , Byeong Kil Shin , Jung Woo Lee , Hee Soo Lee , Kwun Nam Hui |
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| Abstract |
| Aluminosilicate inorganic polymer binder has been studied as an alternative to ordinary Portland cement due to its higher physical properties, chemical resistance and thermal resistance. This study has been carried out in an attempt to understand the hardening characteristics of aluminosilicate binder by varying the content of calcium. Samples with four different ratios of Al, Si, and Ca were synthesized in this study with the Al:Si:Ca mol ratio being 1.00:1.85~1.98:0.29~2.12. Furthermore, an alkali silicate solution was prepared with the sodium hydroxide (NaOH) and sodium silicate (NaSi). The hardening characteristics of the specimens were analyzed using XRD, SEM, and TG/DTA. In addition, compressive strength and sintering time of specimens were measured as a function of calcium content. The results showed that the specimen containing 2.12 mol% calcium offered the highest compressive strength. However, the compressive strength of the specimen containing 0.26 mol% calcium was lower relative to the other specimens. The results displayed a distinct tendency that as more calcium was added to the inorganic polymer, setting time became shorter. When calcium was added to the inorganic polymer structure, a second phase was not formed, indicating that the addition of calcium does not affect the crystalline structure. |
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| Key Words |
| amorphous materials, chemical synthesis, crystal structure, X-ray diffraction, aluminosilicate |
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