Abstract
The effect of salt freeze-thaw cycles coupled with carbonation on the mechanical performance of quick hardening sulphoaluminate cement-based reactive powder concrete combined with basalt fibers was investigated. The ratios of basalt fibers in sulphoaluminate cement-based reactive powder concrete (SAC-RPC) were 1%, 2%, 3% and 4% by the volume of concrete. The mechanical strengths (compressive strength, flexural strength and bonding strength) of SAC-RPC were investigated after curing for 5 h, 1 d, 14 d and 28 d, respectively. Meanwhile, the mechanical strengths of resultant concrete were detected, when different NaCl freeze-thaw cycles and carbonation were adopted. Results showed that the addition of basalt fibers could effectively improve the mechanical strengths, especially the flexural strength of SAC-RPC. The dosage of 3.0% was the threshold value affected mechanical strengths. The flexural, compressive and bonding strengths of SAC-RPC were higher than 8.53 MPa, 34 MPa and 3.21 MPa, respectively. The mass loss and mechanical strengths loss of SAC-RPC increased in the form of quadratic function with the increasing number of NaCl freeze-thaw cycles and varied in the form of quadratic decreasing function. Meanwhile, the effect of carbonation on the mechanical strengths of SAC-RPC can be ignored. Additionally, the coupling effect of salt freeze-thaw cycles and carbonation could accelerate the attenuation of concrete strength. The mechanical strengths loss demonstrated a decreased quadratic function with the increasing volume of basalt fibers.
Highlights
Bridge is the pivotal part of building structures, which carries a lot of traffic load.damage often occurs to its deck due to the action of load on the surface
When the curing age was 5 h, the flexural and compressive strengths of basalt fibers reinforced sulphoaluminate cement-based reactive powder concrete (SAC-RPC) was higher than 8.53 MPa and 34 MPa, respectively, which was enough to the passage of vehicles
When the dosages of basalt fibers increased from 0% to
Summary
Bridge is the pivotal part of building structures, which carries a lot of traffic load.damage often occurs to its deck due to the action of load on the surface. A variety of repair materials have been developed for the maintenance-repairing of the deck of bridges. The resistance to aging on fatigue performance of the asphalt based repairing materials is poor. The cement-based materials are often used in the repairing engineering of bridge deck [7,8,9]. Jin et al [10,11,12], pointed out that the magnesium phosphate cement-based materials possessed impressive compressive and bending strengths higher than 13 MPa and 3.5 MPa, respectively, after curing for 1 h. The tensile bonding strength of bricks repaired by asphalt based repairing materials after curing for 1 d was 2.466 MPa [10]. As found out in Hu’s paper [15], sulphoaluminate cement mortar reinforced with micro-fine steel fibers displayed a maximum compressive strength of
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