Effect of coarse aggregate type on mechanical properties of concretes with different strengths

Özturan, Turan; Çeçen, Cengizhan

doi:10.1016/s0008-8846(97)00006-9

Cited by 190 publications

(92 citation statements)

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“…For example, the bond between ITZ and aggregate is, for normal strength concretes, the weakest link of the composite and where failure usually initiates but, on the other hand, proper bond is essential for a composite, heterogeneous material, such as concrete, to act in a monolithic manner [24]. This bond is affected by aggregate properties, such as texture (Figure 8), modulus of elasticity, CTE, porosity, absorption, and possibly surface energy, as well as by matrix (and ITZ) properties, such as modulus of elasticity, possible chemical affinity/reactivity with the aggregate, porosity, strength and preferential alignment of hydration products at the interface with the aggregate [2,12,[22][23][24][25]. As an example, significant differences in the measured bond strength in mixtures with different aggregates were observed by Tasong et al [3][4][5] which they attributed to the roughness of the aggregate surface (texture), as well as the physical-chemical bond between the hydrating cement paste and the aggregate, due to chemical reactions.…”

Section: Concrete Mechanical Properties In Relation To Aggregate Charmentioning

confidence: 99%

“…While some attention is paid to aggregate gradation to assure proper flow and avoid segregation issues, generally less consideration is given to the mineralogy of the (coarse) aggregates, as designers are often limited to what is available locally. Still, it is well known from previous studies [1][2][3][4][5][6][7][8][9][10][11][12] that coarse aggregate type can have a significant impact on properties and performance of concrete. This impact depends on the microstructure of the interfacial transition zone that is formed between coarse aggregates and the surrounding mortar [10,[13][14][15][16], and particularly on the level of bond established between these two.…”

Section: Introductionmentioning

confidence: 99%

“…Purdue regression line was taken from [21]. Previous evaluation of the influence of aggregates on concrete properties has been limited to only a few aggregate properties and has never included so many different aggregate mineralogies [2,5,10,12,[22][23][24][25][26][27], as in the current study. This study is a collaboration between the National Institute of Standards and Technology (NIST) and the Turner Fairbank Highway Research Center (TFHRC) and presents an extensive characterization of these 11 sources of aggregates (ten crushed stones and one gravel) aimed to provide the basis for a better understanding of which aggregate properties play a role in the concrete's mechanical performance.…”

Section: Introductionmentioning

confidence: 99%

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Influence of aggregate characteristics on concrete performance

Bentz¹,

Arnold²,

Boisclair³

et al. 2017

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While the influence of paste properties on concrete performance has been extensively studied and in many cases reduced to quantitative relationships (e.g., Abram's law), that between aggregate characteristics and concrete performance has not been investigated in detail. Based on previous research that demonstrated significant strength differences for two similar concrete mixtures, one prepared with limestone aggregates and the other with siliceous gravel, a joint study between the National Institute of Standards and Technology (NIST) and the Federal Highway Administration (FHWA) was initiated to explore in detail the influence of aggregate source, mineralogy, and material properties on concrete performance. Eleven aggregates of differing mineralogy were identified and obtained both for bulk characterization and for incorporation into two concrete mixtures. The first concrete mixture was based on a 100 % ordinary Type I/II portland cement (OPC), while the second consisted of a ternary 60:30:10 volumetric blend of this cement with 30 % of a Class C fly ash and 10 % of a fine limestone powder. This latter sustainable mixture had exhibited exemplary performance in a previous study. Aggregates were characterized with respect to mechanical and thermomechanical properties, geometrical characteristics, and surface energies. For the prepared concretes, mechanical, thermomechanical, and electrical properties were measured at different ages out to 91 d and microstructural examinations were conducted to examine the interfaces between aggregates and cement paste. Concrete performance varied widely amongst the different aggregates, with the (range/average) ratio for 28-d compressive strength being 0.32 for the OPC concretes and 0.37 for those based on the ternary blend binder. With the exceptions of relating concrete modulus to aggregate modulus and concrete coefficient of thermal expansion (CTE) to aggregate CTE, weak correlations were generally obtained between a single aggregate characteristic and concrete performance properties. Models to predict 28-d compressive strength based on the aggregates' CTE (and aggregate absorption in the case of the ternary blend mixtures) provided predictions with a relative standard error (standard error/mean) of about 7 %. It is suggested that aggregate and binder characteristics control the bond between aggregates and paste. Then, for most properties, concrete performance is primarily controlled by the level of this bonding, a characteristic that was only assessed in an indirect manner in the present study. Research using non-linear ultrasonic measurements to better assess this bonding in specimens remaining from the present study is currently underway.

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Section: Concrete Mechanical Properties In Relation To Aggregate Charmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of aggregate characteristics on concrete performance

Bentz¹,

Arnold²,

Boisclair³

et al. 2017

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“…As usually known, compared to crushed stone, natural pebble has less particle gradation, higher porosity, less angular surface and less bond force of cement paste [1][2][3][4]. And that is the reason why natural pebble are not commonly apply in the concrete that requires high-strength and impermeability.…”

Section: Introductionmentioning

confidence: 99%

Study on Mechanical Character of C50 Box-beam Concrete with Natural Pebbles

Qin¹,

Zhang²,

Zhang³

et al. 2018

Proceedings of the 2017 3rd International Forum on Energy, Environment Science and Materials (IFEESM 2017)

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“…In Kenya, the commonly used coarse aggregates are crushed stones while the commonly used fine aggregates are river sand. Research has also shown that the type, amount, composition, gradation and quality of aggregates affect the durability and compressive strength of concrete [5] [8] [21]- [28]. It has also been reported that the particle size distribution and fraction of coarse aggregates influence both the workability and strength properties of concrete [29].…”

Section: Introductionmentioning

confidence: 99%

Influence of Constituent Materials Properties on the Compressive Strength of in Situ Concrete in Kenya

Okumu¹,

Shitote²,

Oyawa³

2017

OJCE

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The poor quality of Kenyan in situ concrete has necessitated research to establish the properties of the ingredient materials and their influence on the troubling rate of failure of reinforced concrete structures in the country during construction and usage. The compressive strength of concrete relies on the properties of the constituent materials, proportions of the mixture, workmanship, compaction method and curing conditions. This paper outlines findings of an experimental investigation on the properties of Kenyan concrete ingredient materials and their influence on the compressive strength of concrete in Kenya. Three types of cements (42.5N, 32.5R, 32.5N) from six different cement manufacturers and fine aggregates from three different regions in the country were used during the study. Cements and aggregates chemical analysis was done using the Atomic Absorption Spectrometer machine while the physical and the mechanical properties were checked based on the British Standards. The British DOE concrete mix design method was used to generate the concrete mix proportion and concrete was tested for early and ultimate compressive strengths at 7, 14 and 28 days. It was observed that the different cement brands have varying properties with CEM A having the highest ultimate compressive and flexural strengths. It was further noted that aggregates from the coastal region produced concrete of higher compressive strengths. When the commonly used mix design method was adopted, blended Portland cements produced concrete with ultimate compressive strengths lower than the designed target strengths. The study therefore recommends the development of a concrete mix design procedure for blended cement concrete production in Kenya.How to cite this paper:

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Effect of coarse aggregate type on mechanical properties of concretes with different strengths

Cited by 190 publications

References 0 publications

Influence of aggregate characteristics on concrete performance

Influence of aggregate characteristics on concrete performance

Study on Mechanical Character of C50 Box-beam Concrete with Natural Pebbles

Influence of Constituent Materials Properties on the Compressive Strength of in Situ Concrete in Kenya

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