The effect of w/b and temperature on the hydration and strength of blastfurnace slag cements

Castellano, Claudia C.; Bonavetti, Viviana L.; Donza, Horacio A.; Irassar, Edgardo F.

doi:10.1016/j.conbuildmat.2015.11.001

Cited by 90 publications

(27 citation statements)

References 26 publications

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“…As a result, types and volume percentages of reaction products in blended paste are different from those in pure cement paste. Microstructure of cement paste is generally improved due to the physical effects (filler effects as fine particles) and chemical effects (reaction with CH due to the pozzolanic activity of fly ash and the hydraulic potential of slag) of SCMs . Thus, the resistance of blended cement paste to carbonic acid water is different from that of pure cement paste.…”

Section: Introductionmentioning

confidence: 99%

“…Microstructure of cement paste is generally improved due to the physical effects (filler effects as fine particles) and chemical effects (reaction with CH due to the pozzolanic activity of fly ash and the hydraulic potential of slag) of SCMs. 9,10 Thus, the resistance of blended cement paste to carbonic acid water is different from that of pure cement paste. Numerous studies [11][12][13][14][15] reported that SCMs affect the carbonation rate by varying the amount of carbonatable component in hydration product (i.e., CaO content) and the pore structure.…”

Section: Introductionmentioning

confidence: 99%

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Effect of supplementary cementitious materials on the resistance of cement paste to carbonic acid water

Yin

Chen

Yang

et al. 2018

Structural Concrete

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Cement pastes blended with fly ash or slag suffering from carbonic acid water were investigated. Thermogravimetric analysis was performed to determine the effect of fly ash and slag on CH content in cement pastes. Mercury intrusion porosimetry was used to characterize the effect of fly ash and slag on pore structure of cement pastes. Decalcification shrinkage and corrosion depth were determined to characterize the deterioration of cement paste after corrosion. The results show that the decalcification shrinkage is related to the initial CaO content and the composition of CSH gel. The corrosion depth depends on its initial CH content and pore structure. The results show that the paste blended with both fly ash and slag has good resistance to carbonic acid water in terms of decalcification shrinkage (reduced by nearly one half compared by the largest one) together with corrosion depth (reduced by nearly one third compared by the largest one). Furthermore, H2CO3 diffusion coefficient of the paste as a function of time was determined, which can be used to predict the durability of the pastes.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of supplementary cementitious materials on the resistance of cement paste to carbonic acid water

Yin

Chen

Yang

et al. 2018

Structural Concrete

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“…The ultimate values of mechanical properties are also affected by the curing temperature. At higher temperature, the faster hydration results in a less homogenous matrix with coarser pores, and therefore to lower mechanical properties [2,3]. This explains the so-called crossover effect, which generally appears after several days, and is significant for high temperature variations.…”

Section: Introductionmentioning

confidence: 99%

Unified modelling of the temperature effect on the autogenous deformations of cement-based materials

Carette

Staquet

2018

Cement and Concrete Composites

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Temperature effects are of primary importance for designing concrete structures. Some of the early age temperature effects on the concrete behaviour can be accurately taken into consideration by well-known maturity functions. However, the effect of temperature on the autogenous deformations development is more complex, and results in contradictory evidence. This paper studies the influence of various isothermal curing temperatures from 10°C to 30°C on the autogenous deformations of concrete. Binary and ternary binders containing up to 30% of limestone filler and 70% of blast-furnace slag are studied. The amplitude of both the self-desiccation deformation and the early age swelling deformation are observed to decrease with increasing temperature, whatever the binder nature. Mechanisms for this observation are suggested, and a corresponding model is developed. The effect of the binder nature, age and temperature on the autogenous deformations is assessed with this model. Based on this new model, it is shown that the effect of temperature on the autogenous deformation development can be either beneficial or detrimental, depending on the nature of the binder.

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“…Mineral admixtures are extensively applied in blended cement and concrete; this process is a substantial contribution to the field of civil engineering. The technology of steam curing has been primarily employed for pure cement concrete rather than concrete with a large portion of mineral admixtures as many researchers and housing developers have expressed their concern that the early compressive strength of concrete with a large portion of mineral admixtures is low [16][17][18], which make it difficult to satisfy the requirements of form removal strength of steam-cured concrete at the end of steam curing. This is an obstacle to the use of steam curing for concrete that incorporates a large portion of mineral admixtures.…”

Section: Introductionmentioning

confidence: 99%

Influence of Steam Curing Method on the Performance of Concrete Containing a Large Portion of Mineral Admixtures

Wang

Yang

2017

Advances in Materials Science and Engineering

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A comparison was made between the impact of raising the thermostatic temperature and the impact of prolonging the thermostatic time on the performance of steam-cured concrete containing a large portion of fly ash (FA) or ground granulated blast furnace slag (GGBS) by analysing the form removal strength, chemically combined water content, reaction degree, strength development, chloride permeability, and volume stability. For the materials and test conditions reported in this study, raising the thermostatic temperature is more favourable for concrete containing FA, as indicated by the significantly higher form removal strength and the higher growth of reaction degree of FA compared with prolonging the thermostatic time. With an increase in the thermostatic temperature, the hydration degree of a binder containing FA or GGBS initially increases and subsequently decreases. Although concrete containing FA can obtain satisfactory form removal strength with steam curing at 80°C, the late strength development of concrete containing FA is slow for the same curing conditions. The effect of the late performance of resistance to chloride ion permeability improved by FA is better than the effect improved by GGBS. The risk of destroying the structure of concrete containing a large portion of FA or GGBS due to delayed ettringite formation (DEF) is minimal when specimens were steam-cured at 80°C.

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The effect of w/b and temperature on the hydration and strength of blastfurnace slag cements

Cited by 90 publications

References 26 publications

Effect of supplementary cementitious materials on the resistance of cement paste to carbonic acid water

Effect of supplementary cementitious materials on the resistance of cement paste to carbonic acid water

Unified modelling of the temperature effect on the autogenous deformations of cement-based materials

Influence of Steam Curing Method on the Performance of Concrete Containing a Large Portion of Mineral Admixtures

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