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http://dx.doi.org/10.5345/JKIBC.2017.17.2.135

Effect of Phosphate Types on the Strength and pH of Magnesia-Phosphate Composites  

Lee, Kyung-Ho (Department of Architectural Engineering, Graduate School, Kyonggi University)
Yang, Keun-Hyeok (Department of Plant.Architectural Engineering, Kyonggi University)
Publication Information
Journal of the Korea Institute of Building Construction / v.17, no.2, 2017 , pp. 135-140 More about this Journal
Abstract
As an elementary investigation to develop vegetation concrete with a relatively low pH value, magnesia-phosphate composites (MPC) were examined according to the phosphate types including Monoammonium, Monosodium, Monopotassium, Monocalcium, Diammonium, Disodium, Dipotassium, and Diacalcium phosphates. All of the MPC binders, the ratio of magnesia to phosphate was fixed to be 7:3. MPC mortars activated with Disodium, Dipotassium, and Diacalcium phosphates showed no compressive strength gain, even at age of 28 days. Meanwhile, MPC mortars with Monoammonium and Monosodium phosphates developed 28-day compressive strength of more than 34MPa, and showed a relatively low pH value below 9.8. Hence, Monoammonium and Monosodium phosphates have potentials as an activator for producing MPC-based vegetation concrete.
Keywords
magnesia-phosphate composite; pH; compressive strength; vegetation concrete; MgO;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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1 Kim WJ, Kim ST, Park SJ, Ghim SY, Chun WY. A Study on the development of self-Healing smart concrete using microbial bio-mineralization. Journal of the Korea Concrete Institute. 2009 Aug;21(4):501-11.   DOI
2 Sierra-Beltran MG, Jonkers HM, Schlangen E. Characterization of sustainable bio-based mortar for concrete Repair. Construction and Building Materials. 2014 Sep;67:344-52.   DOI
3 Brady NC, Weil RR. Elements of the Nature and Properties of Soils. 3rd ed. New Jersey: Prentice Hall; 2009. 576 p.
4 Lee KH, Yang KH. Evaluation of pH and compressive strength development of alpha-calcium sulfate hemihydrate-based binder. Journal of the Korea Institute of Building Construction. 2016 Feb;16(1):59-65.   DOI
5 Iyengar SR, Al-Tabbaa A. Developmental study of a low-pH magnesium phosphate cement for environmental applications. Environmental Technology. 2010 28(12):1387-401.   DOI
6 Kang IS, Ahn MY, Paik MS, Jung SJ. A study on field and hydration properties ultra rapid hardening mortar using magnesia-phosphate cement. Journal of the Architectural Institute of Korea (Structure & Construction). 2008 Feb;24(2):79-86.
7 Kang SP, Kim JH. Ilfluence of mixing factors on the early-age properties of magnesium potassium phosphate cement mortar. Journal of the Architectural Institute of Korea (Structure & Construction). 2015 May;31(5):61-8.   DOI
8 Wagh AS. Chemically bonded phosphate ceramics, 1st ed. New Jersey: Elsevier; 2004. 283 p.
9 Yang Q, Zhu B, Zhang S, Wu X. Properties and applications of magnesia-phosphate cement mortar for rapid repair of concrete. Cement and Concrete Research. 2000 Nov;30(11): 1807-13.   DOI
10 Kim DY. Physical and chemical characteristics of MgO based mortar for cultural heritage conservation [Master's thesis]. [Seoul (Korea)]: Seoul National University; 2014. 87 p.
11 Kang IS. A study on the basic properties of ultra rapid Hardening mortar using magnesia-phosphate cement [Master's thesis]. [Yongin (Korea)]. Dankook University; 2008. 89 p.
12 Neville AM. Properties of concrete, 5th ed. New Jersey: Prentice Hall; 2011. 846 p.