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·The fine aggregate used was river sand whose fineness modulus was and the maximum size was less than 5 mm Crushed limestone was used as coarse aggregate with sizes in the range of 5 mm to 20 mm Six 150 × 150 × 150 mm cubes three 150 × 150 × 300 mm prisms and three 100 × 100 × 400 mm prisms were prepared for compressive strength
·The dependence of this fracture toughness on aggregate size is to be expected for different maximum aggregate sizes give different materials cf Table 1 Finally the fact that then this toughness decreases with maximum aggregate size appears to be consistent with the expected presence of large pre existing bond cracks and imperfections in
Toughness and Abrasion Resistance Aggregates undergo substantial wear and tear throughout their life In general they should be hard and tough enough to resist crushing degradation and disintegration from any associated activities including manufacturing stockpiling production placing compaction in the case of HMA and consolidation in
·Due to its advanced mechanical properties and durability performance fiber reinforced concrete is widely used for engineering structures [[1] [2] [3]] There are many types of fibers used in civil engineering to reinforce concrete such as glass fibers [4] steel fibers [5] natural fibers [6] and synthetic fibers [7] Steel fibers can significantly enhance the flexural
·This paper investigates the effects of steel fiber content and coarse aggregate size on the mechanical properties of high strength concrete with a specified compressive strength value of 60 MPa The paper also explores the correlation between the compressive and flexural toughness of high strength steel fiber reinforced concrete SFRC
To ensure the durability of a concrete airport runway the aggregates within the concrete require sufficient toughness to withstand impact forces and
·Various researchers [1] [2] [3] have proposed different hypothesis regarding the failure of plain concrete Failure in concrete occurs due to the deterioration of bond between the aggregate and binding matrix [4] In 1980 Wittmann [3] suggested that failure of concrete can be modeled by using a three level approach which includes the macro meso and micro levels
·This study examines the influence of the weight percentage of large aggregates with maximum size d max on the tensile strength and fracture toughness of concrete using a simple fracture mechanics model The concrete mixes were grouped according to the content by weight of large aggregates with d max of 15% 30% 45% 60% and 100% relative to the total
·Regardless of the strain rates the toughness and dynamic compressive strength enhance with the expanding maximum coarse aggregate size while the dynamic increase factor and peak strain decrease with the rising coarser aggregates size The damage degree of UHPC enhances with strain rate but reduces with the increasing maximum aggregate size
·Two different mechanisms may increase fracture toughness 1 breakage of aggregate and fibres at matrix/fibre contact results in crack development Because the aggregate is brittle the fracture separates it into two parts Significant elongation of fibres makes it difficult to separate from the matrix; thus a crack must go around it
Request PDF On Sep 1 2023 Hak Young Kim and others published Toughness Performance of Lightweight Aggregate Concrete Reinforced with Steel Fibers Find read and cite all the research you
·The fracture energy decreases with an increasing aggregate content based on the size effect law method [20] Double K fracture toughnesses initial fracture toughness and unstable fracture toughness were found to vary with specimen size when dam concrete with maximum aggregate size being around 150 mm was investigated [21] While for mode
·The deformation performance of recycled aggregate concrete can be effectively improved when basalt fiber is reasonably added In this paper the effects of the basalt fiber volume fraction and the length diameter ratio on the uniaxial compression related failure characteristics feature points of the complete stress strain curve and the compressive
·Recycled aggregate is derived from waste concrete through the process of crushing and screening Toughness reflecting the possibility of brittle fracture is a measure of the energy absorbed by a material during deformation The flexural toughness index is a method that is used to measure the energy absorbed by materials and their
·c Toughness Resistance to impact is termed as toughness Aggregates used in the pavement are also subjected to impact due to moving wheel loads and hammering action due to jumping of tires Hence toughness is another desirable property of road aggregate d Soundness/Durability
·The inclusion of coarse aggregate also weakened the flexural behaviour of HPC especially in terms of the peak flexural load peak deflection toughness and post peak ductility Furthermore the steel fibre volume dosage had a limited effect on compressive strength but significantly enhanced the splitting tensile strength and flexural behaviour
·Aggregate is an important ingredient in concrete which can be regarded as the skeleton of concrete Fig 3 shows the relationships between the fracture energy G F and fracture toughness K IC and maximum aggregate size d max It was shown that both fracture energy and fracture toughness increased with increasing maximum aggregate size
·The maximum decreasing amplitudes of pre peak flexural toughness index and flexural toughness ratio of CA UHPC are 28% and 22% lower than that of UHPC while the decreasing amplitudes of the post
·To solve the key scientific problems such as low toughness and easy cracking of recycled aggregate concrete RAC A new sustainable material fiber reinforced recycled aggregate concrete FRAC
Bamboo had possessed high strength and high toughness but a conflict between the flexibility and flexural toughness existed Compared to natural wood species of similar density the flexibility and flexural toughness of bamboo was ∼ and times
·The contribution of coarse aggregate in transferring the stresses in high strength concrete HSC is very important The microcrack formation and its growth at the interface are significantly influenced by the bond strength and fracture toughness Since the mortar aggregate interface in HSC is stronger cracks transmit into the aggregate
·The research shows that when 20% of waste foundry sand is used to replace fine aggregate the fracture toughness of concrete decreases by 25% Aslani et al 2021 Therefore too large or too small an aggregate volume ratio will reduce the fracture energy and fracture toughness of concrete When using aggregate with high strength and high
aggregate hardness on fracture toughness and compressive strength of concrete 2 Experiments Materials and specimens The natural fine aggregate used in this study was from Palu River with silt content of % The coarse aggregate with particle size of 20 down to 5 mm was engaged Three different quarries of coarse aggregate
