Abstract
This study investigated the effects of shrinkage compensation on the tensile and cracking responses of strain-hardening cement composite (SHCC) by adding calcium sulfoaluminate (CSA)-based expansive additive (EXA) to the mixture. Such responses are closely related to the durability of concrete structures, of dumbbell-shaped SHCC specimens, and reinforced SHCC ties. For this study, two SHCC mixtures and a conventional concrete mixture with a specific compressive strength value of 30 MPa were prepared and measured in terms of shrinkage history, compressive strength, flexural strength, and direct tensile strength. The test results show that the mechanical properties of shrinkage-compensated SHCC with 10% CSA-based EXA are superior to those of conventional SHCC and concrete mixtures. Also, reinforced tension ties with shrinkage-compensated SHCC exhibited the best multiple cracking and tension-stiffening behavior among the three types of tension ties tested. The results show that shrinkage compensation using CSA-based EXA in SHCC with rich mixture is effective for resisting crack damage. Shrinkage-compensated SHCC may be used for civil infrastructure facilities that require high levels of durability and are exposed to extreme environments.
Highlights
Reinforced concrete (RC) is an effective material for civil infrastructure construction due to its durability, economic advantages and superior compressive strength
This is sometimes referred to as high performance fiber-reinforced cement composite (HPFRCC), engineered cementitious composite (ECC), or strain-hardening cement composite (SHCC)
They showed that the replacement of ordinary cement by calcium sulfoaluminate (CSA)-based expansive additive (EXA) effectively reduces the shrinkage in SHCC that contains 1.5% polyethylene (PE) fibers and has a high binder content
Summary
Reinforced concrete (RC) is an effective material for civil infrastructure construction due to its durability, economic advantages and superior compressive strength. Several researchers have focused on the development and application of a new type of short fiber-reinforced durable cement composite that exhibits tensile strain-hardening and multiple-cracking behaviors after the initial crack [5,6,7] This innovative composite material is effective in improving the brittleness of ordinary cement composite. Ahmed and Mihashi [8] reviewed various durability properties, such as permeability, corrosion resistance, freeze-thaw resistance, and shrinkage crack resistance, of SHCC from published research results They reported that the higher strain and crack-damage mitigation capacities of SHCC compared to ordinary concrete provide superior durability-related performance. The present study investigates the feasibility of utilizing shrinkage-compensating SHCC to improve the durability of existing or new infrastructures and the effect of 10% replacement of cement with CSA-based EXA for the shrinkage compensation of SHCC on the mechanical properties. The study examines the shrinkage-compensating effects of reinforced SHCC tension ties on the structural and cracking behaviors that are related to the durability of concrete structures
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