Influence of the Cement Fineness on Strengths of Cement Pastes Containing High Phosphorus Slag
Publication: Journal of Materials in Civil Engineering
Volume 27, Issue 12
Abstract
Mechanical grinding was used to increase the specific surface area of cement in order to increase the dosage of phosphorus slag (PS) in Type cement. X-ray diffraction, hydration heat, and scanning electron microscopy were used to analyze the hydration process of cement containing PS. The results show that the increase of fineness of cement can obviously improve the mechanical property of PS cement pastes. When specific surface area increased to , the flexural strength and compressive strength of cement mortars mixed with 40% PS for 3 and 28 days are 3.77, 17.6, 9.89, and 52.0 MPa, respectively, still meeting the strength requirements of Type cement. The PS admixture can effectively lower the hydration heat of cement. Phosphorus slag delayed the hydration process of cement, inhibited the formation of ettringite and contributed a low strength of mortars for 3 days curing. The degree of hydration of PS at the early ages was low, leading to a poor interface between PS particle and cement matrix.
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Acknowledgments
The research reported in this paper was financially supported by the project of Panzhihua Municipal Science and Technology (No. 2012CY-S-19), Anhui Provincial Science and Technology Foundation (No. 1301042127) and the Open Foundation from the State Key Laboratory of Materials-Oriented Chemical Engineering (No. KL13-14).
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© 2015 American Society of Civil Engineers.
History
Received: Jul 28, 2014
Accepted: Feb 19, 2015
Published online: Apr 16, 2015
Discussion open until: Sep 16, 2015
Published in print: Dec 1, 2015
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