The influence of calcium nitrate as antifreeze admixture on the compressive strength of concrete exposed to low temperatures

Karagöl, Fatma; Demirboğa, Ramazan; Kaygusuz, Mehmet Akif; Yadollahi, Mehrzad Mohabbi; Polat, Rıza

doi:10.1016/j.coldregions.2013.02.001

Cited by 100 publications

(46 citation statements)

References 2 publications

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“…Hence, numerous studies have been carried out to develop nonchloride accelerator instead to remove the possibility of corrosion, especially in aggressive environments. Calcium nitrate [4,5], aluminate [6], and lithium salts [7] can change the setting time and strength of cement through their chemical properties. In addition, limestone powder [1,8] and silica fume [9] can be used as physical accelerators to modify the cement at low temperatures.…”

Section: Introductionmentioning

confidence: 99%

Effect of TiO₂ Nanoparticles on Physical and Mechanical Properties of Cement at Low Temperatures

Wang

Zhang

Gao

2018

Advances in Materials Science and Engineering

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Low temperature negatively affects the engineering performance of cementitious materials and hinders the construction productivity. Previous studies have already demonstrated that TiO 2 nanoparticles can accelerate cement hydration and enhance the strength development of cementitious materials at room temperature. However, the performance of cementitious materials containing TiO 2 nanoparticles at low temperatures is still unknown. In this study, specimens were prepared through the replacement of cement with 1 wt.%, 2 wt.%, 3 wt.%, 4 wt.%, and 5 wt.% TiO 2 nanoparticles and cured under temperatures of 0°C, 5°C, 10°C, and 20°C for specific ages. Physical and mechanical properties of the specimens were evaluated through the setting time test, compressive strength test, flexural strength test, hydration degree test, mercury intrusion porosimetry (MIP), X-ray diffraction (XRD) analysis, thermal gravimetric analysis (TGA), and scanning electron microscopy (SEM) in order to examine the performance of cementitious materials with and without TiO 2 nanoparticles at various curing temperatures. It was found that low temperature delayed the process of cement hydration while TiO 2 nanoparticles had a positive effect on accelerating the cement hydration and reducing the setting time in terms of the results of the setting time test, hydration degree test, and strength test, and the specimen with the addition of 2 wt.% TiO 2 nanoparticles showed the superior performance. Refined pore structure in the MIP tests, more mass loss of CH in TGA, intense peak appearance associated with the hydration products in XRD analysis, and denser microstructure in SEM demonstrated that the specimen with 2 wt.% TiO 2 nanoparticles exhibited preferable physical and mechanical properties compared with that without TiO 2 nanoparticles under various curing temperatures.

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Section: Introductionmentioning

confidence: 99%

Effect of TiO₂ Nanoparticles on Physical and Mechanical Properties of Cement at Low Temperatures

Wang

Zhang

Gao

2018

Advances in Materials Science and Engineering

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“…UPV test method can be used for detecting internal cracks, porosity, and microstructure of cement‐based materials . The UPV values in a solid material are higher than the UPV values in the regions where the voids are present and, as the hydration process continues, the volume of void decreases and UPV values increases .…”

Section: Resultsmentioning

confidence: 99%

The influence of expanded perlite aggregate on compressive strength, linear autogenous shrinkage, restrained shrinkage, heat of hydration of cement‐based materials

Polat

Demirboğa

Karagöl

2018

Structural Concrete

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This paper investigates the effects of expanded perlite aggregate (EPA) on the properties of mortar and concrete. A volume of 10, 20, and 30% EPA were used instead of 0–2 mm fine aggregate. Water/binder ratio of 0.30 was constant for all the mortar and concrete mixtures. The compressive strength, ultrasonic pulse velocity (UPV), and linear autogenous shrinkage tests were performed on both mortar and concrete mixtures. Furthermore, the heat of hydration test was only made for mortar mixtures and restrained shrinkage test was only employed to measure cracking time and strain for concrete mixtures. For both mortar and concrete mixtures, the experiments show that the compressive strength, UPV, and linear autogenous shrinkage were generally decreased with increasing the amount of EPA according to control sample, while the heat of hydration is generally increased. However, the reduction ratios in the compressive strength of mortar and concrete samples gradually decreased with increasing the curing time. In addition, the increases in the heat of hydration for EPA10, EPA20, and EPA30 were 5, 7, and 8%, compared with the control.

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“…Specimens relating to mixes PR, P0.5%g, P1%g, P3% g, P1%rg and P1%a were tested after curing at the ages of 3, 7 and 28 days (see Table 4). It is noted that the specimens cured at −1 or −5°C were allowed to warm up to a uniform temperature of 20°C before testing (Karagöl, Demirboğa, Kaygusuz, Yadollahi, & Polat, 2013). Table 4.…”

Section: Flexural and Compressive Strengthmentioning

confidence: 99%

Glycerol resulting from biodiesel production as an admixture for cement-based materials: an experimental study

Azenha

Lucas

Granja

et al. 2016

European Journal of Environmental and Civil Engineering

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Concrete admixtures are frequently expensive and may carry relevant ecological footprints, reason why there is a growing necessity and interest in finding cheaper and more sustainable alternatives. The present work focused on the evaluation of the potential benefits that might be harvested by adding a partially purified biodiesel byproduct as an admixture to cement-based materials. An experimental programme was carried out on several mixes of cement paste and mortar, incorporating the by-product in the cementitious mix in the following mass fractions (as a function of cement content): 0.5, 1 and 3%. Several testing techniques have been deployed for characterising material properties of the tested cement pastes and mortars, namely: flowability, setting time, compressive strength, elastic modulus, shrinkage and permeability. The obtained results led to the main observation that biodiesel-derived glycerol can be used as an accelerating admixture with the optimum mass faction of 1%.

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The influence of calcium nitrate as antifreeze admixture on the compressive strength of concrete exposed to low temperatures

Cited by 100 publications

References 2 publications

Effect of TiO₂ Nanoparticles on Physical and Mechanical Properties of Cement at Low Temperatures

Effect of TiO₂ Nanoparticles on Physical and Mechanical Properties of Cement at Low Temperatures

The influence of expanded perlite aggregate on compressive strength, linear autogenous shrinkage, restrained shrinkage, heat of hydration of cement‐based materials

Glycerol resulting from biodiesel production as an admixture for cement-based materials: an experimental study

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The influence of calcium nitrate as antifreeze admixture on the compressive strength of concrete exposed to low temperatures

Cited by 100 publications

References 2 publications

Effect of TiO2 Nanoparticles on Physical and Mechanical Properties of Cement at Low Temperatures

Effect of TiO2 Nanoparticles on Physical and Mechanical Properties of Cement at Low Temperatures

The influence of expanded perlite aggregate on compressive strength, linear autogenous shrinkage, restrained shrinkage, heat of hydration of cement‐based materials

Glycerol resulting from biodiesel production as an admixture for cement-based materials: an experimental study

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Effect of TiO₂ Nanoparticles on Physical and Mechanical Properties of Cement at Low Temperatures

Effect of TiO₂ Nanoparticles on Physical and Mechanical Properties of Cement at Low Temperatures