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http://dx.doi.org/10.4334/JKCI.2017.29.3.275

Effect of Phosphate-to-binder and Water-to-binder Ratio on Magnesia-potassium Phosphate Cement  

Lee, Kyung-Ho (Dept. of Architectural Engineering, Kyonggi University Graduate School)
Yoon, Hyun-Sub (Dept. of Architectural Engineering, Kyonggi University Graduate School)
Yang, Keun-Hyeok (Dept. of Plant.Architectural Engineering, Kyonggi University)
Publication Information
Journal of the Korea Concrete Institute / v.29, no.3, 2017 , pp. 275-281 More about this Journal
Abstract
This study examined the effect of water-to-binder ratio (W/B) and phosphate-to-binder ratio (P/B) on the flow, setting time, compressive strength development, and pH variation of magnesium-potassium phosphate composites, MKPC mortars. Ten mortars mixtures were prepared with the W/B varying from 20% to 40% at each P/B of 0.3 or 0.5. The hydration products and microstructural pore distribution of the MKPC pastes were investigated using X-ray diffraction (XRD), scanning electron microscope (SEM) and mercury intrusion porosimetry (MIP). The initial flow and setting time of MKPC mortars tended to decrease with an increase of P/B, indicating that the final setting time was shortened by approximately 24% when P/B increased from 0.3 to 0.5. The slope of the early-strength development measured in the MKPC mortars was considerably higher than that of cement concrete specified in code provisions. For obtaining a relatively good 28-day strength (above 30 MPa) and a near neutral pH (below 9.0) in MKPC mortars, the P/B and W/B need to be selected as 0.5 and 30%, respectively. The strubite-K crystal increased with the increases of P/B and W/B, which leads to the decrease of the macro-capillary pores.
Keywords
magnesia-phosphate cement; water-to-binder ratio; phosphate-to-binder ratio; setting time; compressive strength;
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Times Cited By KSCI : 1  (Citation Analysis)
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