TY - JOUR
T1 - Magnesium oxychloride cement-based strain-hardening cementitious composite : mechanical property and water resistance
AU - Yu, Kequan
AU - Guo, Yingying
AU - Zhang, Y. X.
AU - Soe, Khin
PY - 2020
Y1 - 2020
N2 - A new category of magnesium oxychloride cement-based strain-hardening cementitious composites (MOC-SHCC) with high-strength and high-ductility is developed in this research. The eco-friendly and high-strength MOC mortar is used as the matrix and ultra-high-molecular-weight polyethylene (PE) fiber is deployed as reinforcement. The development of mechanical properties of the MOC-SHCC with the curing ages varying from 12 h (h) to 28 days (d) is fully investigated and the high-early-strength characteristic of MOC-SHCC is demonstrated. The compressive, flexural, and tensile strength of the MOC-SHCC at 1d reach 71.4 MPa, 25.2 MPa, and 8.28 MPa respectively, accounting for 56%, 84%, and 75% of the corresponding values at 28d. The tensile capacities of the MOC-SHCC decrease slightly with the curing age, while all the values are beyond 6% accompanying with the evenly distributed microcracks. Additionally, water resistance of the MOC-SHCC is systematically investigated by using an accelerating method through immersing specimens into 60 °C hot water for 7d and 28d at the curing ages of 1d, 3d and 28d, respectively. The developed high-performance MOC-SHCC features with high early strength, high ductility, and satisfactory water resistance, which would have a strong potential application in practical engineering.
AB - A new category of magnesium oxychloride cement-based strain-hardening cementitious composites (MOC-SHCC) with high-strength and high-ductility is developed in this research. The eco-friendly and high-strength MOC mortar is used as the matrix and ultra-high-molecular-weight polyethylene (PE) fiber is deployed as reinforcement. The development of mechanical properties of the MOC-SHCC with the curing ages varying from 12 h (h) to 28 days (d) is fully investigated and the high-early-strength characteristic of MOC-SHCC is demonstrated. The compressive, flexural, and tensile strength of the MOC-SHCC at 1d reach 71.4 MPa, 25.2 MPa, and 8.28 MPa respectively, accounting for 56%, 84%, and 75% of the corresponding values at 28d. The tensile capacities of the MOC-SHCC decrease slightly with the curing age, while all the values are beyond 6% accompanying with the evenly distributed microcracks. Additionally, water resistance of the MOC-SHCC is systematically investigated by using an accelerating method through immersing specimens into 60 °C hot water for 7d and 28d at the curing ages of 1d, 3d and 28d, respectively. The developed high-performance MOC-SHCC features with high early strength, high ductility, and satisfactory water resistance, which would have a strong potential application in practical engineering.
KW - cement composites
KW - magnesium oxychlorides
KW - mechanical properties
KW - water resistance
UR - http://hdl.handle.net/1959.7/uws:57742
U2 - 10.1016/j.conbuildmat.2020.119970
DO - 10.1016/j.conbuildmat.2020.119970
M3 - Article
SN - 0950-0618
VL - 261
JO - Construction and Building Materials
JF - Construction and Building Materials
M1 - 119970
ER -