Researchers from Chungnam National University examined the effects of shrinkage compensation on the tensile and cracking responses of strain-hardening cement composite (SHCC)
Reinforced concrete is used in the construction industry, owing to its durability, economic advantages, and superior compressive strength. However, cover concrete has low tensile strength and is brittle in nature, which may promote crack formation in structures made from reinforced concrete, owing to mechanical or environmental stress. These cracks are evident on the surface of the concrete members and can decrease the load-bearing capacity of the structure. Moreover, crack formation also degrades aesthetic appeal of the structure. Water or other chemical agents that reside in the cramped spaces eventually reach the steel reinforcement to promote oxidization that may weaken the structure. Such deterioration may increase economic burden and cause environmental problems.
Now, a team of researchers from Chungnam National University and Korea Infrastructure Safety Corporation examined the effects of shrinkage compensation on the tensile and cracking responses of strain-hardening cement composite (SHCC). The team added calcium sulfoaluminate (CSA)-based expansive additive (EXA) to the mixture. The team conducted tests to examine shrinkage, compressive strength, flexural strength, and the direct tensile strength of conventional and shrinkage-compensating SHCC materials for durable infrastructures. Moreover, the team also examined the tensile and cracking behaviors of reinforced concrete, conventional SHCC, and shrinkage-compensating SHCC ties under monotonic and cyclic loading. The findings were published in the journal MDPI Sustainability on March 8, 2019.
The team found that shrinkage strain for the SC-SHCC30 mixture was around 32% less compared to that of the SHCC30 mixture after 28 days. The team replaced a part of the Portland cement binder by CSA-based EXA and found that the approach was effective in overcoming the shrinkage of PE and steel fiber-reinforced SHCC materials with rich mixture under drying conditions. The team compared the SHCC30 and SC-SHCC30 mixtures and found an effective increase in compressive strength, flexural strength, and direct tensile strength of the structure. When CSA-based EXA in SHCC materials were replaced with rich mixture, the mechanical performance, the flexural and direct tensile strength of SHCC increased significantly.
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