Specimen and Aggregate Size Effect on Concrete Compressive Strength

Hooton, RD; Issa, S; Islam, MdS; Issa, Mohsen A.; Yousif, AA

doi:10.1520/cca10470j

Cited by 31 publications

(4 citation statements)

References 5 publications

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“…Figure 3 shows the gradation curves for coarse and fine aggregates. The maximum aggregate size was 12 mm, which is acceptable for the 75 mm diameter specimens prepared for use in this study (see Issa et al 2000).…”

Section: Methodsmentioning

confidence: 97%

Mechanical and hydraulic characterization of plastic concrete for seepage cut-off walls

2010

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This paper describes a series of laboratory tests performed to characterize the mechanical and hydraulic properties of plastic concrete (PL-C). PL-C is used in the construction of seepage cut-off walls in dams and it comprises cement, aggregate, and water mixed with sodium bentonite. The addition of sodium bentonite causes a reduction in strength and improved ductility after failure compared with normal concrete. The mechanical properties of PL-C are studied using a series of unconfined compression tests and confined compression tests performed while simultaneously permeating water through PL-C specimens. Stress relaxation and controlled rate of loading tests are also performed to investigate the rate-sensitivity and time-dependency of plastic concrete. The test results show that the hydraulic conductivity of PL-C increases between two and three orders of magnitude during triaxial compression due to yielding, crack formation, and dilation of the cracks. Such changes in the behaviour of PL-C should be minimized during design by controlling the working strains and using erosion-resistant mixes. In addition to these findings, PL-C exhibits significant time-dependent behaviour similar to that observed for clays, and the variation of compressive strength versus confining stress is comparable to normal strength concrete.

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Section: Methodsmentioning

confidence: 97%

Mechanical and hydraulic characterization of plastic concrete for seepage cut-off walls

2010

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“…with adequate aggregate proportioning, proper aggregate quality and proper water/cement ratio. Looking at the test results from the scientific literature [18,[35][36][37][38][39][40][41] we can see that test data show a dispersion similar to the one showed in figures 7 and 8.…”

Section: Discussionmentioning

confidence: 56%

“…By elimination, we can argue that this effect could be due to the round and smooth surface of the larger aggregates, even though more research is due on this issue. The effect of large aggregates on the behavior of concrete is not new and is still a research issue of the academic community, [40][41][42][43][44][45] among the others.…”

Section: Discussionmentioning

confidence: 99%

Core-to-Cubic Strength Ratio for Historical-Like Concrete

Brencich¹,

Hasweh²,

Pera³

2021

cea

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Coring is considered to provide the best estimate of concrete compressive strength in existing structures and is commonly used to calibrate Non-Destructive and Moderately Destructive Techniques. Historical concrete, produced in the pre-code period until the '20s, significantly differs from modern concrete due to lack of standardization, improper rules of thumbs and to aggregate shape (round, smooth and often excessively large aggregates) and proportioning. Therefore, the applicability of the procedures calibrated on modern concrete to a historical one, also coring, is an issue that needs to be discussed. In this paper, an experimental campaign on historical-like concrete, i.e. with the same defects as historical concrete, aims at identifying the reliability of drilled cores due to the effect of round aggregates. The results show that standard procedures commonly used on modern concrete cannot be directly applied to historical concrete: drilled cores suffer from scale effects (core diameter) and from cutting damage of the material much more than modern concrete. In detail, the core-to-cubic ratio, that modern codes assume in the range 0.70-0.85, due to the dimension and shape of the aggregates is found inside a larger range, 0.70-1.00, and, as opposed to modern concrete, is found to be decreasing as concrete strength increases. Besides, the diameter of the core is found to have a relevant effect on the estimate of the material compressive strength and on the core-to-cubic strength ratio, pointing out that the dimension of the core affects the results much more than for modern concrete. This latter result, which needs further research, points out that historical concretes may be rather different from modern ones and probably need larger cores to be drilled than modern concrete due to the larger dimension of aggregates that are often found in pre-code concrete.

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“…Finally, the author also pointed out that the compressive strength ratio of 150×300 mm cylinder to 100×200 mm cylinder is 0.86 [10]. Issa et al in their research conducted to evaluate the size effect of cylinders on compressive strength of concrete, used 150×300 mm, 100×200 mm, 75×150 mm, and 50×100 mm size plastic moulds to cast 600 cylinders [11]. Experimental evaluation of compressive strength and modulus of elasticity revealed that co-efficient of variation of compressive strength increased as size of cylinder decreased.…”

Section: Introductionmentioning

confidence: 99%

Effect of Mould Size on Compressive Strength of Green Concrete Cubes

et al. 2019

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This paper is aimed to evaluate the effect of mould size on compressive strength of concrete cubes made with recyclable concrete aggregates. Natural coarse aggregates were replaced with 50% recycled aggregates from old demolished concrete. Five different mould sizes were used to cast 420 concrete cubes using 1:2:4 mix and 0.55 water/cement ratio. In each size equal number of cubes was cured for 3, 7, 14 and 28-day. After curing, weight of cubes was determined followed by testing for compressive strength in universal load testing machine with gradually increasing load. From the obtained results the strength correction coefficients were computed keeping 28-day cured standard size cubes as control specimens. Also, numerical expression based on regression analysis was developed to predict the compressive strength using weight of cube, area of mould and curing age as input parameter. The numerical equation predicts the compressive strength very well with maximum of 10.86% error with respect to experimental results.

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Specimen and Aggregate Size Effect on Concrete Compressive Strength

Cited by 31 publications

References 5 publications

Mechanical and hydraulic characterization of plastic concrete for seepage cut-off walls

Mechanical and hydraulic characterization of plastic concrete for seepage cut-off walls

Core-to-Cubic Strength Ratio for Historical-Like Concrete

Effect of Mould Size on Compressive Strength of Green Concrete Cubes

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