【摘 要】
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With adding certain fluoride, the effects of phosphorus on the solid solubility of MgO in high MgO cement clinkers, the strength and microstructure of the clinker samples were investigated by chemical
【机 构】
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School of materials science and engineering, Zhengzhou University, Zhengzhou, Henan, China 450001
【出 处】
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The 14th International Congress on the Chemistry of Cement (
论文部分内容阅读
With adding certain fluoride, the effects of phosphorus on the solid solubility of MgO in high MgO cement clinkers, the strength and microstructure of the clinker samples were investigated by chemical analysis,mechanical property testing and X-ray diffraction (XRD).The results showed: only doping Ca (H2PO4) 2·H2O in the clinker, with the increase of the content of P2O5, 28-day strength of cement clinker increased slightly.At the same content of F-, complex mixing Ca (H2PO4) 2.H2O or CaHPO4.2H2O were conducive to improving the later strength of the clinker.In case of doping phosphoms ion by Ca (H2PO4) 2·H2O in the clinker of containing F-, with the increase of P2O5 content, the strengths at 28 day ages were increase at first and then decreased,the of P2O5 had a optimal content, then the effect was not distinct if the content of the phosphorus was too high or too low.Adding the opportune CaF2 in the clinker, with the increase of Ca (H2PO4) 2·H2O content, the concetrations of f-MgO < 1.66%, and the trend was downward in the rough.Doping CaHPO4.2H2O was more helpful to improve the solid solubility MgO than Ca (H2PO4) 2·H2O.In the range of the experimental doping amount, single-doped CaF2, the M2-M3 polymorph of alite could be stabilized only.And when the addition content of Ca (H2PO4) 2·H2O was 0.2% on the basis of adding CaF2, the mixture of M3 to R polymorph of alite could be stabilized.But, the Ca (H2PO4) 2·H2O had the optimal content, while the content Ca (H2PO4) 2·H2O was high to 0.8%, polymorph of alite transformed M2 to M3 polymorph again.
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