Application of internal curing for mixtures containing high volumes of fly ash

Varga, Igor De la; Castro, Javier; Bentz, Dale P.; Weiss, Jason

doi:10.1016/j.cemconcomp.2012.06.008

Cited by 128 publications

(50 citation statements)

References 23 publications

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“…Moreover, the water content in LWA, particle size and pore structure of LWAs determine its curing effect as internal curing agents in concrete (Bentz and Weiss 2011). Figure 1 illustrates the difference between external and internal curing (De la Varga et al 2012). For the case of internal curing, the pre-wetted LWAs are introduced into the HSC and the additional water can fill the empty capillary pores created during the hydration process of cementitious material, reducing the autogenous shrinkage of concrete (Henkensiefken et al 2009a).…”

Section: Introductionmentioning

confidence: 99%

Influence of Curing Conditions on Properties of Normal and High Strength Concrete with and without Pre-Wetted Lightweight Aggregates

Wang

Bao

Cheng

2017

ACT

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This paper presents the results of an experimental study conducted to evaluate the effect of curing conditions on the properties of normal and high strength concrete (NSC and HSC) with and without pre-wetted lightweight aggregates (LWAs). Cylinder specimens were drilled out from square concrete slabs subjected to four curing regimes (i.e. standard, water, natural and sealed curing) respectively, and then tested to obtain the compressive strength after 60 days. Three discs cut along the height direction of cylinder specimens (top, middle and bottom) were used to orderly measure the ultrasonic pulse velocity (UPV), open porosity, water absorption and splitting tensile strength. Afterwards, the comprehensive evaluation index, i.e. relative curing efficiency (RCE), was proposed based on the testing results above to quantitatively assess the effect of curing conditions on the physical properties of concrete. The experimental results indicated that curing conditions significantly influence the strengths and durability-related properties of NSC and HSC. The linear correlation can be obtained between sorptivity and open porosity of concrete under various curing conditions. Furthermore, in terms of the RCE analysis, the durability-related properties are more sensitive to the curing conditions than strengths for NSC and HSC.

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Section: Introductionmentioning

confidence: 99%

Influence of Curing Conditions on Properties of Normal and High Strength Concrete with and without Pre-Wetted Lightweight Aggregates

Wang

Bao

Cheng

2017

ACT

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“…All HVFA mixtures exhibited a higher strength than the target w/c=0.42 mixture for ages of 14 d and beyond. While IC produced an increase in compressive strength, results for elastic modulus (not shown here) indicated a reduction on the order of 10 % when HVFA mortar mixtures with IC were compared to their non-IC counterparts [37]. A beneficial side effect of a reduced elastic modulus, however, could be a reduced cracking tendency in these HVFA mixtures with IC.…”

Section: Curing Optionsmentioning

confidence: 88%

“…The efficacy of IC for HVFA mixtures has been examined recently in a study where the properties of mortar mixtures with 40 % and 60 % Class C fly ash (volumetric replacement for cement) with and without IC were contrasted [37]. In that study, IC was supplied via a prewetted fine LWA that replaced a portion of the normal weight sand in the examined mortars.…”

Section: Curing Optionsmentioning

confidence: 99%

Best Practices Guide for High-Volume Fly Ash Concretes : Assuring Properties and Performance

Bentz¹,

Ferraris²,

Snyder³

2013

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A best practices guide is developed from a synthesis of recent research on high-volume fly ash (HVFA) concrete mixtures. These best practices can be applied by the concrete construction industry to achieve desired properties and to ensure the (high) performance of HVFA concrete mixtures in practice. As such, the report considers all aspects of HVFA concrete production, from the characterization of the starting materials, through mixture proportioning and curing options to achieve desired properties, to the in-place early-age and long-term performance of the concrete in its fresh and hardened states. Both mechanical and transport properties are considered in detail. Perspective is established based on a brief review of current practices being employed nationally. Each topical section is concluded with a practice-based set of recommendations for the design and construction community. The report is intended to serve as a valuable resource to these communities, providing both a research summary and a guide to practical steps that can be taken to achieve the optimum performance of these sustainable concrete mixtures.

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“…These same effects might not be observed at all in a system that is not on the edge of calcium deficiency, as exemplified by the results obtained with limestone and quartz powders (each about 5 mm in diameter) in a Class F fly ash blended cement that were recently presented in reference . As another example of the influence of the silica powder on early age reactions, isothermal calorimetry results for mortars with various volumetric substitutions for cement by a silica powder (slightly coarser than the one employed in the current study) are provided in Figure 3.5 (De la Varga, 2013). In this case, the three mortars with silica substitutions were prepared with the same dosage of HRWRA, while the HRWRA dosage in the 100% cement mortar was double this value to provide adequate flow .…”

Section: Resultsmentioning

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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Application of internal curing for mixtures containing high volumes of fly ash

Cited by 128 publications

References 23 publications

Influence of Curing Conditions on Properties of Normal and High Strength Concrete with and without Pre-Wetted Lightweight Aggregates

Influence of Curing Conditions on Properties of Normal and High Strength Concrete with and without Pre-Wetted Lightweight Aggregates

Best Practices Guide for High-Volume Fly Ash Concretes : Assuring Properties and Performance

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

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