Abstract
This study evaluated the mechanical properties and durability performance of latex-modified hybrid fiber-reinforced roller-compacted rapid-set cement concrete (LMHFRCRSC) for emergency repair of concrete pavement. Experimental parameters included the blend ratio of the hybrid fiber, which comprised natural jute fiber (0–0.2 vol.%) and structural synthetic fiber (0–2 vol.%). The mechanical performance of LMHFRCRSC of various blend ratios was evaluated in terms of compressive, flexural, and splitting tensile strength. Durability assessment included chlorine ion penetration and abrasion resistance measurements. Compressive and flexural strength values of 21 and 3.5 MPa, respectively, were the set targets after 4 h of curing; a compressive strength of 35 MPa, a flexural strength of 4.5 MPa, a splitting tensile strength of 4.2 MPa, and chloride ion penetration of 2000 C or less were required after 28 days of curing. Our test results confirmed that all mix proportions satisfied the target values, regardless of the blend ratio of the hybrid fiber. Specifically, the mechanical performance of the concrete improved as the blend ratio of the structural synthetic fiber increased. With regard to durability, a greater amount of jute fiber, a hydrophilic fiber, enhanced the concrete’s durability. Additionally, incorporating jute fiber of 0.6 kg/m3 provided excellent chlorine ion penetration resistance. The optimal blend ratio for the hybrid fiber was natural jute fiber at 0.6 kg/m3 and structural synthetic fiber at 13.65 kg/m3 (mix: J0.6 + P13.65); with this mix proportion, a chloride ion penetration amount of 1000 C or less and maximum mechanical performance were achieved.
Highlights
Roller-compacted concrete (RCC), which exhibits little to no fluidity, does not have the consistency required for compaction, unlike general concrete, and is compacted by external vibrators such as a vibration roller and vibration press compactor [1,2,3]
The tests showed that all mixtures achieved the target compressive strengths of 21 modulus (GPa) TensilePsrtorepnegrttyh (MPa) at 4 h and 35 MPa at 28 days, regardless of the blend ratio of the hybrid fiber
In the case of the hybrid fiber-reinforced blend, the compressive strength improved as the incorporation rate of the structural synthetic fiber increased; increasing the amount of jute fiber in the hybrid fiber blend reduced the compressive strength of the concrete mixture
Summary
Roller-compacted concrete (RCC), which exhibits little to no fluidity, does not have the consistency required for compaction, unlike general concrete, and is compacted by external vibrators such as a vibration roller and vibration press compactor [1,2,3]. Rollercompacted concrete pavement (RCCP), as a drier concrete, allows construction projects to proceed without interruption, as it sets rapidly without the need for reinforcement. This concrete is more economical compared to other concrete products [4,5,6]. RCCP has a low water-to-cement ratio compared to general concrete pavement; there is little moisture evaporation, which minimizes the likelihood of cracking due to shrinkage on evaporation. If some of the constituent materials of the RCC are replaced with rapid-set cement and latex, it may be possible to further enhance the durability and workability simultaneously, thereby allowing the modified material to be used for emergency repair of concrete pavement [1,2]. Most roller-compacted rapid-set cement concrete uses only 5%
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