Effect of curing compounds on the properties and microstructure of cement concretes

Bin, Xue; Pei, Jianzhong; Sheng, Yanping; Li, Rui

doi:10.1016/j.conbuildmat.2015.10.124

Cited by 34 publications

(14 citation statements)

References 14 publications

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“…is the volume fraction of cement before hydration 306 V(o)Add is the volume fraction of unreacted addition before hydration 307 V(t)cem is the volume fraction of unhydrated cement at hydration time t, and 308 V(t)Add is the volume fraction of unreacted addition at hydration time tcompressive strengths of ambient-and ideal-cured CEM I and fly ash 313blend concretes is presented inFigure 5. In all instances the ideal-cured samples 314 had higher strengths than the ambient-cured samples, in agreement with other 315 findings(Xue et al, 2015, Ozer and Ozkul, 2004, Nahata et al, 2014. This effect 316 was more pronounced for the lower strength samples.…”

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confidence: 76%

The effect of improper curing on properties that may affect concrete durability

Idowu¹,

Black²

2018

Magazine of Concrete Research

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Good curing, enabling prolonged hydration and the development of a well-developed 10 microstructure, is imperative if concrete is to perform at its full potential. This may 11 become more important with the increasing use of composite cements containing 12 more slowly reacting additions. Furthermore, the effects of improper curing, i.e. 13 compromised durability, may not become visible for many years. 14 A series of concrete mixes have been prepared of 20 or 50 MPa target mean 15 strength, using either CEM I or CEM I + 30% fly ash as the binder. Mixes were 16 designed with two different workabilities, (10-30 and 60-180 mm slump) Samples 17 were cured in a fog room at 20 ± 3 0 C and 99 ± 1% RH or under ambient conditions 18 20 ± 3 0 C and 42 % RH. Performance was evaluated in terms of compressive 19 strength, transport properties and resistance to carbonation. Equivalent paste 20 samples were characterised by TGA, XRD and SEM to follow hydration and 21 microstructural development. 22 Improper curing did not greatly affect compressive strength. However, the effects on 23 transport properties, and therefore properties that may affect durability, were more 24 profound. The effects of non-ideal curing were greater for lower strength mixes, 25 those containing fly ash and, to a less extent, less workable mixes. 26

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confidence: 76%

The effect of improper curing on properties that may affect concrete durability

Idowu¹,

Black²

2018

Magazine of Concrete Research

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“…Water curing is the most commonly used method in construction practice, where water is applied all over the freshly cast structural elements, that are often covered with burlap, continuously for three to seven days. The purpose of water curing is to retain water in the structural elements in order to entrap the moisture needed for hydration of the binder [16]. American Concrete Institute (ACI) 301 [17] recommends the minimum curing period to be the time required to achieve 70% of the specified compressive strength.…”

Section: Introductionmentioning

confidence: 99%

“…American Concrete Institute (ACI) 301 [17] recommends the minimum curing period to be the time required to achieve 70% of the specified compressive strength. Traditional curing methods serve their intended purpose but often require significant amounts of water to cure all structural elements [16]. Membrane-forming curing compounds are known to enhance durability but their effect on compressive strength development may vary depending on the type of curing compound.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Mix Constituents and Curing Conditions on Compressive Strength of Sustainable Self-Consolidating Concrete

Mohamed

2019

Sustainability

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The production of cement requires significant energy and is responsible for more than 5% of global CO2 emissions; therefore it is imperative to reduce the production and use of ordinary portland cement (OPC). This paper examines the compressive strength development of low water-to-binder (w/b) ratio self-consolidating concrete (SCC) in which 90% of the cement is replaced with industrial by-products including ground granulated blast furnace slag (GGBS), fly ash, and silica fume. The emphasis in this paper is on replacing a large volume of cement with GGBS, which represented 10% to 77.5% of the cement replaced. Fresh properties at w/b ratio of 0.27 were examined by estimating the visual stability index (VSI) and t50 time. The compressive strength was determined after 3, 7, 28, and 56 days of curing. The control mix made with 100% OPC developed compressive strength ranging from 55 MPa after three days of curing to 76.75 MPa after 56 days of curing. On average, sustainable SCC containing 10% OPC developed strength ranging from 31 MPa after three days of curing to 56.4 MPa after 56 days of curing. However, the relative percentages of fly ash, silica fume, and GGBS in the 90% binder affect the strength developed as well. In addition, this paper reports the effect of the curing method on the 28 day compressive strength of environmentally friendly SCC in which 90% of the cement is replaced by GGBS, silica fume, and fly ash. The highest compressive strength was achieved in samples that were cured for three days under water, then left to air-dry for 25 days, compared to samples cured using chemical compounds or samples continuously cured under water for 28 days. The study confirms that SCC with 10% OPC and 90% supplementary cementitious composites (GGBS, silica fume, fly ash) can achieve compressive strength sufficient for many practical applications by incorporating high amounts of GGBS. In addition, air-curing of samples in a relatively high temperature (after three days of water curing) produce a higher 28 day compressive strength compared to water curing for 28 days, or membrane curing.

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“…is reduces the strength of the structure and affects its integrity and durability ( Figure 1) [10,11]. ird, as studies on the impact of the hydration heat on the strength of concrete have shown [12][13][14] a lot of heat is produced by the hydration of foamed concrete, which may affect the strength of the material. Because the coefficient of thermal conductivity for this material is low, high temperatures are maintained for very long periods in the structure.…”

Section: Introductionmentioning

confidence: 99%

Study on the Heat of Hydration and Strength Development of Cast‐In‐Situ Foamed Concrete

Zhao

Han

et al. 2020

Advances in Materials Science and Engineering

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is study aims to investigate the relationship between the heat of hydration and the strength development of cast-in-situ foamed concrete. First, indoor model tests are conducted to determine the effects of the casting density and the fly ash content on the hydration heat of foamed concrete in semiadiabatic conditions. Second, compression tests are carried out to evaluate the development of the compressive strength with the curing time under standard curing conditions and temperature matched curing conditions. ird, the hydration heat development of the foamed concrete is tested in four projects. e results showed that the peak temperature, the maximum temperature change rate, and the maximum temperature difference increased with the increase in the casting density at different positions in the foamed concrete. For the same casting density of the foamed concrete, the peak temperature, the maximum temperature change rate, and the maximum temperature difference decreased with the increase in the fly ash content. For the foamed concrete without the admixture, the early strength was significantly higher under temperature matched curing conditions than under standard curing conditions, but the temperature matched curing conditions had a clear inhibitory effect on the strength of the foamed concrete. e strengths during the early stage and the later stage were both improved under temperature matched curing conditions after adding the fly ash, and the greater the fly ash content, the larger the effect. e maximum temperature increments were higher in the indoor model test than in the field tests for the same casting density. Reasonable cooling measures and the addition of fly ash decreased the maximum temperature increments and increased the corresponding casting times.

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Effect of curing compounds on the properties and microstructure of cement concretes

Cited by 34 publications

References 14 publications

The effect of improper curing on properties that may affect concrete durability

The effect of improper curing on properties that may affect concrete durability

Effect of Mix Constituents and Curing Conditions on Compressive Strength of Sustainable Self-Consolidating Concrete

Study on the Heat of Hydration and Strength Development of Cast‐In‐Situ Foamed Concrete

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