Aggregate-cement chemical interactions

Tasong, W.A; Cripps, J. C.; Lynsdale, C.J.

doi:10.1016/s0008-8846(98)00067-2

Cited by 79 publications

(35 citation statements)

References 12 publications

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“…Synthetic pore solution was created using a procedure adapted from Tasong et al [3] and Lawrence [35]. First, 75 g of cementitious materials (OPC or ternary blend) were gradually added to 300 mL of deionized water and stirred in a sealed container for about 2 h. Then, the resultant solution was filtered through a 10 µm filter.…”

Section: Characterization Of Aggregatesmentioning

confidence: 99%

“…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%

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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: Characterization Of Aggregatesmentioning

confidence: 99%

Section: Concrete Mechanical Properties In Relation To Aggregate Charmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of aggregate characteristics on concrete performance

Bentz¹,

Arnold²,

Boisclair³

et al. 2017

View full text Add to dashboard Cite

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“…This test used the method described by Tasong [9] . First, the aggregates were crushed into fine powder, and the cement solution containing Ca 2+ , K + , Na + , Al 3+ , Si 4+ , OH − and other minor ions was obtained.…”

Section: Specimens Preparation and Testing 231 Chemical Interactionmentioning

confidence: 99%

“…Actually the aggregates are more chemically active than has been previously supposed. It was observed that ions are both absorbed and released by the aggregates studied in the aggregatecement solution systems [9] , which possibly indicates that hydration of the surface layer has taken place. For example, it has been found that a chemical reaction between carbonate aggregate and tricalcium silicate of the cement takes place, and the products yielded can improve the bond strength [10] .…”

Section: Introductionmentioning

confidence: 96%

Interfacial interaction of aggregate-cement paste in concrete

Kong

Du²

2015

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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The chemical and physical interactions in the interfacial transition zone (ITZ) between three different types of coarse aggregates (limestone, granite and basalt) and cement paste were investigated. The results show that all the aggregates are chemically active. Signifi cant amounts of Ca 2+ , K + , and Na + are absorbed by all the aggregates from the cement solution, granite and basalt also absorb signifi cant amounts of OH -and release signifi cant amounts of Si 4+ into cement solution. The XRD, EDXA and pore structure results of the ITZ also show that more clinkers participate in the cement hydration in the ITZ of granite and basalt, and more hydrates are generated, hence resulting in a denser ITZ structure with a lower content of macropores. Although the limestone has the least activity, the connection between it and cement paste is tight, due to its rough surface and higher water absorption. Whereas the granite with smooth surface and lower water absorption has a loose connection with cement paste, many pores and cracks are visible, which is very detrimental to the concrete durability.

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Effects of styrene–acrylic emulsion on bond performance and interface microstructure of repair mortar of ternary cementitious system

Shi,

Bu,

2024

J of Applied Polymer Sci

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This study investigates the effects of styrene–acrylic emulsion (SAE) as a modifier and interfacial agent on the interfacial bond performance of ordinary Portland cement–aluminate cement–gypsum (PAG) repair mortar. The hydration products and interfacial microstructure are analyzed via x‐ray diffraction (XRD), x‐ray photoelectron spectroscopy (XPS), Fourier‐transform infrared (FTIR) spectroscopy, and scanning electron microscopy (SEM). The results demonstrate that the addition of SAE can effectively enhance the tensile bond strength and flexural bond strength of the PAG repair mortar, and the optimal addition amount of SAE is 10 wt%. The tensile and flexural bond strengths of the PAG repair mortar with SAE interfacial agent at 40% concentration are 1.38 and 1.34 times than those of the mortar without the interfacial agent, respectively. XPS and FTIR analyses reveal that the carboxyl groups in SAE and Ca2+ generated from cement hydration form Ca2+–carboxyl complexes. The SEM and XRD analyses indicate that SAE can alter the distribution and size of crystals at the bond interface and considerably reduce the thickness of the bond interface; however, SAE cannot change the type of hydration products at the bond interface.

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Aggregate-cement chemical interactions

Cited by 79 publications

References 12 publications

Influence of aggregate characteristics on concrete performance

Influence of aggregate characteristics on concrete performance

Interfacial interaction of aggregate-cement paste in concrete

Effects of styrene–acrylic emulsion on bond performance and interface microstructure of repair mortar of ternary cementitious system

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