2020
DOI: 10.1680/jcoma.17.00081
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Mechanical behaviour of coarse, lightweight, recycled and natural aggregates for concrete

Abstract: In this study the application of the single-particle compression test is discussed as an alternative method for the mechanical characterisation of coarse aggregates generally employed in concrete manufacturing. This leads to an estimation of the tensile strength and fracture energy of the aggregate particles. A wide range of aggregate types is considered. In particular, the mechanical responses of crushed limestone and river gravel are compared with expanded clay, recycled concrete and clay brick aggregates. I… Show more

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Cited by 20 publications
(12 citation statements)
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“…Analyzing the maximum stress theoretically for a spherical particle, the authors [20] proposed estimating the tensile strength (r t ) using Eq. 1, considering only the breakage force (F b ) and the distance between the points of application of the compressive loads (D):…”
Section: Measurement Of Strength Of Single Particlesmentioning
confidence: 99%
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“…Analyzing the maximum stress theoretically for a spherical particle, the authors [20] proposed estimating the tensile strength (r t ) using Eq. 1, considering only the breakage force (F b ) and the distance between the points of application of the compressive loads (D):…”
Section: Measurement Of Strength Of Single Particlesmentioning
confidence: 99%
“…PLT has the advantage of using universal testing machines, that are commonly found in civil engineering laboratories. Tests were used to qualify particles of many rock types (gneiss, granites, quartzite, diorite, basalt, limestone, marble) for geotechnical applications [15][16][17], railway ballast [18,19], or coarse aggregates used in concrete [20]. Tensile strengths of the rock particles (from 4 to 30 mm of size) are significantly variable, varying from about 3 to 9 times even for a material with the same mineralogical origin.…”
Section: Introductionmentioning
confidence: 99%
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“…Guidelines for RAC are needed since RAs are different from coarse natural aggregates (NAs), changing the properties of concrete. The main differences between NAs and RAs are the following: NAs are composed of particles of a single type of stone (limestone, granite and basalt are the most common), while RAs are composed of a mix of several constituents (concrete, mortar, unbound stone, ceramics, glass, and other deleterious contaminants) of different quality and properties [ 6 , 7 ]; This implies that, in general, RAs are weaker, more deformable, more porous and have larger water absorption than NAs [ 8 , 9 ]; At the same time, the mechanical and durability properties of concrete are detrimentally affected by the incorporation of RAs: for the same compressive strength, RAC is typically found to have a smaller Young’s modulus, larger creep and shrinkage and worse durability properties [ 9 , 10 , 11 ]. Fracture energy and tensile strength are also detrimentally affected, especially when the strength class of concrete is larger [ 12 , 13 ]; Regarding the structural behaviour of reinforced concrete, the use of RAs is found to result in larger short- and long-term deflections [ 14 , 15 ].…”
Section: Introductionmentioning
confidence: 99%
“…This implies that, in general, RAs are weaker, more deformable, more porous and have larger water absorption than NAs [ 8 , 9 ];…”
Section: Introductionmentioning
confidence: 99%