Eco-Efficient Fiber-Reinforced Preplaced Recycled Aggregate Concrete under Impact Loading

Abstract

This study explores highly eco-efficient preplaced aggregate concrete mixtures having superior tensile characteristics and impact resistance developed for pavement and infrastructure applications. A fully recycled granular skeleton consisting of recycled concrete aggregate and recycled tire rubber granules, and steel wire fibers from scrap tires are first placed in the formwork, then injected with a flowable grout. Considering its very high recycled content and limited mixing and placement energy (only the grout is mixed, and no mechanical vibration is needed), this material has exceptional sustainability features and offers superior time and cost savings. Moreover, typical problems of rapid loss of workability due to the high-water absorption of recycled aggregates and the floating of lightweight tire rubber granules are prevented since the aggregates are preplaced in the formwork. The much higher granular content and its denser skeleton reduce the cementitious dosage substantially and provide high volume stability against shrinkage and thermal strains. The behavior under impact loading of this sustainable preplaced recycled aggregate concrete, incorporating randomly dispersed steel wire fibers retrieved from scrap tires, was investigated using a drop weight impact test. The results show that recycled tire steel wire fibers significantly enhanced the tensile and impact properties. A two-parameter Weibull distribution provided an accurate prediction of the impact failure strength of the preplaced recycled aggregate concrete mixtures, allowing to avert additional costly laboratory experiments.

Experimental and theoretical behavior of cementitious plates containing ethylene vinyl acetate reinforced with glass woven fabric under impact load

“…In this theoretical calculation, the values encompassed in Method 1 are obtained by using the elasticity modules calculated with the help of the formulation defined for LWC. In Method 2, calculations are made with the help of known formulas (Eqs [1][2][3][4][5][6]) for standard concretes.…”

“…Today, concrete is one of the most used building materials, with high strength, durability, longevity, and resilience [1]. In recent years, various unexpected structural collapses have occurred in reinforced concrete structures.…”

Strength and Durability Properties of Antimony Tailing Coarse Aggregate (ATCA) Concrete

“…Concrete is one of the most popularly used building and construction materials and has been widely researched [ 1 , 2 , 3 ]. In recent years, the green and sustainable production of concrete has received much attention [ 4 , 5 , 6 ]. Coarse aggregate (CA), as the largest component of the concrete mix ratio, has continued to be increased in recent years.…”

Impact of the Geometrical Parameters of Dolomite Coarse Aggregate on the Thermal and Mechanic Properties of Preplaced Aggregate Concrete

“…This type of element could be used in underground structures, high-rise buildings, and long-span bridges [ 19 ]. According to Alfayez et al, highly eco-efficient PAC due to special characteristics such as its impact resistance and high tensile strength could be useful in infrastructure applications—for example, the design of pavements [ 20 ]. In recent years, roller compacted concrete, containing similar ingredients to conventional concrete, has been recommended in pavement construction projects due to the lower possibility of thermal cracking [ 21 ].…”