Relating Compressive Strength to Heat Release in Mortars

Bentz, Dale P.; Barrett, Tim; Varga, Igor De la; Weiss, Jason

doi:10.1520/acem20120002

Cited by 46 publications

(63 citation statements)

References 13 publications

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“…Measured concrete compressive strength as a function of the measured cumulative heat release (per unit volume of water) used to establish a strength-heat release linear relationship (dashed line, R 2 =0.91) [20]. Purdue regression line was taken from [21] . Measured net expansion (0 °C to 100 °C) vs. initial length for the two NIST standard reference materials [43,44].…”

Section: List Of Figuresmentioning

confidence: 99%

“…(per unit volume of water) used to establish a strength-heat release linear relationship (dashed line, R 2 =0.91) [20]. 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.…”

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: List Of Figuresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of aggregate characteristics on concrete performance

Bentz¹,

Arnold²,

Boisclair³

et al. 2017

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“…By doing this, and assuming that the volume of created hydration products is proportional to the heat generated, one can potentially relate the space-filling capabilities of the hydration products with strength (Bentz, Barrett, De la Varga, & Weiss, 2012). A slower heat development is observed with increasing fly ash replacement level as the fly ash is less reactive than the cement, though the fly ash can provide additional space between the cement particles and can act as a nucleating agent which both increase the hydration rate of the cement.…”

Section: Influence Of Fly Ash On the Hydration Rate And Strength Devementioning

confidence: 99%

Increased Use of Fly Ash in Hydraulic Cement Concrete (HCC) for Pavement Layers and Transportation Structures

Varga¹,

Bentz²,

Weiss³

et al. 2012

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“…Bentz et al [12] experimented on a variety of mortar mixtures demonstrated that the compressive strength and cumulative heat of hydration have a linear relationship. Tanesi and Ardani [13] also indicated that the heat of hydration evaluated by isothermal calorimetry turns out to have good correlation with compressive strength at early ages for FA mortar specimens.…”

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confidence: 99%

“…Statically a valid correlation between degree of hydration and compressive strength of normal and blended cement FA are equally found by Shafiq [14]. Journal of Materials Science and Chemical Engineering Given that heat production provides a good indication of the strength development [12] [13] [14], it can be used as a tool to predict the strength development of FA based concrete. It should suffice to rely on the w:b ratio of the paste sample to experimentally determine the degree of hydration of concrete.…”

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confidence: 99%

From Hydration to Strength Properties of Fly Ash Based Mortar

Sofi¹,

Lumantarna²,

Zhou³

et al. 2017

MSCE

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Fly ash (FA) is important alternative or supplement to cement to reduce the environmental impact of concrete industry. However, early age strength development of FA is a concern due to the slower reaction rate of FA compared to cement. This paper examines the early age hydration properties of cement paste containing typical Australian FA and establishes correlations between the degree of hydration and the early-age strength development properties of mortar mixes. All mixes have the same mixture proportion of water to binder (w:b) ratio. FA sourced from different power plants are used for the tests. Cement replacement levels of 0%, 10%, 30% and 40% by mass are considered. The degree of hydration was established from the heat production of the mixes by using isothermal calorimetry. The hydration properties were characterized by hydration curve parameters obtained from curve fitting. The results show that both hydration rate and strength of the binder materials (FA and cement) were reduced with higher replacement levels of FA contributing to a reduced hydration rate at early ages. Linear relationship could be obtained between degree of hydration and strength at early ages for all the fly ash binders.

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Relating Compressive Strength to Heat Release in Mortars

Cited by 46 publications

References 13 publications

Influence of aggregate characteristics on concrete performance

Influence of aggregate characteristics on concrete performance

Increased Use of Fly Ash in Hydraulic Cement Concrete (HCC) for Pavement Layers and Transportation Structures

From Hydration to Strength Properties of Fly Ash Based Mortar

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