Optimization of material characteristics of macro-defect free cement

Ozgur Ekincioglu; M. Hulusi Ozkul; Leslie J. Struble; Silvia Patachia

doi:10.1016/j.cemconcomp.2011.11.003

Optimization of material characteristics of macro-defect free cement

Ozgur Ekincioglu^*, M. Hulusi Ozkul, Leslie J. Struble, Silvia Patachia

^*Corresponding author for this work

Department of Civil Engineering

Research output: Contribution to journal › Article › peer-review

41 Citations (Scopus)

Abstract

Macro-defect free (MDF) cement is a high-strength cement-polymer composite produced by mixing cement (commonly calcium aluminate cement) with small amounts of polymer (commonly polyvinyl alcohol acetate) and water, applying high shear, and finally applying relatively low pressure (about 5 MPa) and modest temperature (about 80-100 °C). However, MDF cements lose considerable strength when exposed to water. The objective of this study was to explore the effects of cement and polymer compositions on flexural strength and water sensitivity. Calcium aluminate cements were used with Al ₂O ₃ contents between 42% and 79%. Production of MDF cement was successful with all cements, but the highest strength (268 MPa) was obtained with 70% Al ₂O ₃ cement. Secondly, PVAs were used that differed in their degree of hydrolysis between 73% and 99%. Of these, the one with a moderate degree of hydrolysis produced the highest strength (228 MPa). All mixtures had strength loss on exposure to water, but PVAs with moderate degrees of hydrolysis exhibited the lowest strength losses (50-60%).

Original language	English
Pages (from-to)	556-565
Number of pages	10
Journal	Cement and Concrete Composites
Volume	34
Issue number	4
DOIs	https://doi.org/10.1016/j.cemconcomp.2011.11.003
Publication status	Published - Apr 2012

Funding

The authors thank the Scientific & Technological Research Council of Turkey (TUBITAK) for supporting this study. Chun-Tao Chen performed the thermal analyses at the University of Illinois and FTIR analyses were performed at the Transilvania University of Brasov with the support of CNCSIS-Romania (Project No: IDEI 389/2009). The PVA samples were kindly supplied by Marubeni America Corporation, NY, USA, and Nippon Gohsei Europe GMBH, Duesseldorf, Germany, and the cements were supplied by Lafarge North America, Chesapeake, Virginia, USA.

Funders	Funder number
CNCSIS-Romania	IDEI 389/2009

Keywords

Calcium aluminate cement
Hydrolysis degree
MDF cements
MDF composites
PVA
Water sensitivity

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10.1016/j.cemconcomp.2011.11.003

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abstract = "Macro-defect free (MDF) cement is a high-strength cement-polymer composite produced by mixing cement (commonly calcium aluminate cement) with small amounts of polymer (commonly polyvinyl alcohol acetate) and water, applying high shear, and finally applying relatively low pressure (about 5 MPa) and modest temperature (about 80-100 °C). However, MDF cements lose considerable strength when exposed to water. The objective of this study was to explore the effects of cement and polymer compositions on flexural strength and water sensitivity. Calcium aluminate cements were used with Al 2O 3 contents between 42% and 79%. Production of MDF cement was successful with all cements, but the highest strength (268 MPa) was obtained with 70% Al 2O 3 cement. Secondly, PVAs were used that differed in their degree of hydrolysis between 73% and 99%. Of these, the one with a moderate degree of hydrolysis produced the highest strength (228 MPa). All mixtures had strength loss on exposure to water, but PVAs with moderate degrees of hydrolysis exhibited the lowest strength losses (50-60%).",

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AU - Struble, Leslie J.

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Optimization of material characteristics of macro-defect free cement

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Keywords

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