A Rehabilitation Experimental Program on Low-Strength Concrete with Steel Bar Planting

Many concrete structures need rehabilitation during their service life for different reasons; poor quality of construction, relatively lower compressive strength of concrete, non-compliance with existing or updated design codes, and buildings that experienced an intensive earthquake are to name but a few. One of the solutions to strengthen concrete structures is to install rebar inside the structural components. In this paper, the effect of steel rebar planting with a constant nominal diameter of ۸ mm along with two different lengths (i.e., ۳۵ and ۵۵ mm) as well as two different planting angles (i.e., ۰ and ۴۵ degrees) have considered as variables. Therefore, the rebar planting process has conducted on ۱۲ low-strength cylindrical concrete specimens with an initial compressive strength of ۱۵.۵ MPa. The concrete column specimens were tested under uniaxial compressive load after rebar planting. The results of this study indicated that rebar planting leads to an increase in the initial compressive strength of the concrete specimens in general. The specimens with ۳۵ mm and ۵۵ mm planted length witnessed an average enhancement of ۱۷% and ۲۳%, respectively. Moreover, considering the angle of planted rebar as another variable parameter, the obtained results revealed that the maximum compressive load for both ۳۵ mm and ۵۵ mm specimens with a planting angle of ۰-degree and ۴۵-degree almost followed the same increase and improved by an average of ۵%.

کلیدواژه ها:

Rehabilitation ، concrete structure ، Low strength concrete ، Compressive Strength ، Steel bar ، rebar planting