Title

Mechanical properties of high-ductility magnesium phosphate cement composite cured at low temperatures

Publication Name

Journal of Building Engineering

Abstract

In some special applications at low temperature, high ductility, deformation, and durability are required for cement-based composites. Magnesium phosphate cement (MPC) possesses unique properties, including fast hardening at a temperature below 0 °C, high early-strength, and durability. This study investigated the influence of the water-to-binder (W/B) ratio, sand-to-binder (S/B) ratio, and various proportions of fly ash (FA) (as a substitute for MPC) on the workability, compressive strength, and tensile properties of high-ductility MPC-based composites (HDMPCC) incorporating polyvinyl acetate (PVA) fibre and cured at low temperatures. The experimental results revealed that the incorporation of up to 30% FA by mass significantly improved the ductility of the HDMPCC. For an S/B ratio of 0.2, strain corresponding to ultimate tensile stress was found to be more than 1.5%, resulting in better strain-hardening behaviour. Moreover, the HDMPCC composite with 30% FA, W/B ratio of 0.14, and S/B ratio of 0.12 exhibited the highest strain corresponding to peak tensile stress at 0 °C. The strain corresponding to peak and ultimate tensile stress ranged from 0.41% to 2.22%. The highest ultimate tensile stress of about 1.28 MPa was observed for HDMPCC specimens cured at 0 °C, –5 °C and –10 °C.

Open Access Status

This publication is not available as open access

Volume

44

Article Number

103275

Funding Number

51809085

Funding Sponsor

National Natural Science Foundation of China

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Link to publisher version (DOI)

http://dx.doi.org/10.1016/j.jobe.2021.103275