Effects of Deicing Salts on the Scaling Resistance of Concrete

Wu, Zemei; Shi, Caijun; Gao, Peiwei; Wang, Dehui; Cao, Zhang

doi:10.1061/(asce)mt.1943-5533.0001106

Cited by 48 publications

(26 citation statements)

References 22 publications

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“…54 This is because nano-CaCO 3 is relatively cheap due to abundant supplying of CaCO 3 in limestone, 55 chalk, and marble, and nano-SiO 2 can present superior performance given its high specific area and 56 pozzolanic activity [ 14 ]. Prototypes of limestone and silica fume have been employed in 57 cement-based materials for many years [15][16][17]. 58 Camiletti et al [14] investigated the effects of nano-and micro-limestone on early age 59 properties of ultra-high performance concrete (UHPC) and found that the addition of nano-and 60 micro-limestone reduced its setting time.…”

mentioning

confidence: 99%

Effects of different nanomaterials on hardening and performance of ultra-high strength concrete (UHSC)

Shi

Khayat

et al. 2016

Cement and Concrete Composites

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210

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Nanomaterials have attracted much interest in cement-based materials during the past 9 decade. In this study, the effects of different nano-CaCO 3 and nano-SiO 2 contents on flowability, heat 10 of hydration, mechanical properties, phase change, and pore structure of ultra-high strength concrete 11 (UHSC) were investigated. The dosages of nano-CaCO 3 were 0, 1.6%, 3.2%, 4.8%, and 6.4%, by the 12 mass of cementitious materials, while the dosages of nano-SiO 2 were 0, 0.5%, 1.0%, 1.5%, and 2%. 13 The results indicated that both nano-CaCO 3 and nano-SiO 2 decreased the flowability and increased 14 the heat of hydration with the increase of their contents. The optimal dosages to enhance 15 compressive and flexural strengths were 1.6% to 4.8% for the nano-CaCO 3 and 0.5% to 1.5% for the 16 nano-SiO 2 . Although compressive and flexural strengths were comparable for the two nanomaterials 17 after 28 d, their strength development tendencies with age were different. UHSC mixtures with 18 nano-SiO 2 showed continuous and sharp increase in strength with age up to 7 d, while those with 19 nano-CaCO 3 showed almost constant strength between 3 and 7 d, but sharp increase thereafter. 20 Thermal gravimetry (TG) analysis demonstrated that the calcium hydroxide (CH) content in UHSC 21 samples decreased significantly with the increase of nano-SiO 2 content, but remained almost 22 constant for those with nano-CaCO 3 . Mercury intrusion porosimetry (MIP) results showed that both 23 porosity and critical pore size decreased with the increase of hydration time as well as the increase of 24 nanoparticles content to an optimal threshold, beyond which porosity decreased. The difference 25 between them was that nano-CaCO 3 mainly reacted with C 3 A to form carboaluminates, while 26 *Corresponding author. Tel./2 nano-SiO 2 reacted with Ca(OH) 2 to form C-S-H. Both nano-CaCO 3 and nano-SiO 2 demonstrated 27 nucleation and filling effects and resulted in less porous and more homogeneous structure. 28 29

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mentioning

confidence: 99%

Effects of different nanomaterials on hardening and performance of ultra-high strength concrete (UHSC)

Shi

Khayat

et al. 2016

Cement and Concrete Composites

Self Cite

210

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“…Besides, after the ice nucleation, the non-linear curve of electrical resistivity-temperature relationship indicates that the amount of ice formed increases non-linearly. From previous results (Wang et al, 2016a;Wu et al, 2014), we understand that the samples contain 5% NaCl solution have more severe damage than DI water case, but in theory, the ice amount in 5% NaCl solution saturated sample is less than in DI water saturated sample. Since the range of electrical resistivity in the case of 5% is highest in Figure 4, it was believed that salt crystallization contributed to the electrical resistivity increase as well.…”

Section: Electrical Resistivity Of Specimen Under Ftcsmentioning

confidence: 95%

“…In particular, the 5% NaCl case reduced progressively with FTCs, and finally it has the most severe damage. This can be explained by the combined effect of ice nucleation and salt crystallization (Wu et al, 2014). The ice expansion can cause destructive damage in mortar and reduce its elastic modulus.…”

Section: Elastic Modulus Changes With Ftcsmentioning

confidence: 99%

“…However, the amount of ice in the case of 5% NaCl is less than DI water in theory (Wang, Gong, Zhang, & Ueda, 2016d), which cannot cause very severe damage. According to Wu et al (2014) study, after salt frost damage of concrete, the Friedel's salt was detected. So, it was believed that this salt crystallization also contribute to the damage of mortar in addition to the ice formation.…”

Section: Elastic Modulus Changes With Ftcsmentioning

confidence: 99%

“…Thus, there is in need to investigate the frost resistance of concrete combined with salt ingress. However, there is still no agreement about the damage mechanism until now (Liu & Hansen, 2015;Wu, Shi, Gao, Wang, & Cao, 2014).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Electrical Response of Mortar Saturated with NaCl Solutions under Freeze–Thaw Cycles

Wang¹,

Gong²,

Ueda³

et al. 2016

Proceedings of the 5th International Conference on the Durability of Concrete Structures

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This paper presents the test results of electrical response of mortar saturated with sodium chloride (NaCl) solutions under freeze-thaw cycles (FTCs). To quantitatively evaluate the salt frost damage of mortar based on its electrical response, mesoscale samples are prepared to assure the uniform pore solution concentration. The reduction of electrical resistivity shows the same tendency with elastic modulus, but with less degree. The investigation shows that electrical resistivity of mortar decreases with temperature and the phase changes can be observed based on their relationship. The freezing and thawing points decreasing with increment of solution concentration can be found, but their variations with FTCs are not significant. Basically, along with frost damage development, the electrical resistivity of mortar at 23 and -28°C is decreasing with FTCs. However, for lower water-to-cement ratio and higher NaCl concentration solution exposed samples, contrary tendency are observed. In addition, with FTCs, there is no clear change for the activation energy of DI water case, whereas the decreasing tendency is observed in the cases of 5 and 15% NaCl solution. Therefore, the electrical properties are important for understanding the salt frost damage, but a comprehensive parameter to quantify the damage is still in need.

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Effects of key parameters on fluidity and compressive strength of ultra‐high performance concrete

Chang

Zheng

2019

Structural Concrete

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The compositions and curing regimes have significant effects on the compressive strength and the fluidity of ultra-high performance concrete (UHPC). Fifty-eight mixtures were examined to determine the effects of key factors on the fluidity and the compressive strength of UHPC. These parameters include water-binder ratio, cement strength, steel fiber content, fly ash content, nanoparticles content, silica fume grade, and curing regimes. The fluidity of UHPC was in the ranges 122-237 mm, while the 28d compressive strength on 70.7 mm cube specimens of UHPC were in the ranges 77-211 MPa. The results showed that fly ash and nanoparticles had significant effects on the fluidity and slight effects on the compressive strength; silica fume grade had slight effects on both the compressive strength and the fluidity; the water to binder ratio, curing regimes, and steel fiber had noticeable effects on the compressive strength. Based on results, the influence coefficients of the investigated key parameters were obtained by regression analysis. Furthermore, the prediction models of the fluidity and the compressive strength of UHPC were proposed by combining the influence coefficients of the investigated key parameters. Therefore, the prediction models can be utilized to optimize the proportions of UHPC mixtures within the ranges of the investigated parameters. K E Y W O R D Scompressive strength, fluidity, key parameters, prediction model, ultra-high performance concrete

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Effects of Deicing Salts on the Scaling Resistance of Concrete

Cited by 48 publications

References 22 publications

Effects of different nanomaterials on hardening and performance of ultra-high strength concrete (UHSC)

Effects of different nanomaterials on hardening and performance of ultra-high strength concrete (UHSC)

Electrical Response of Mortar Saturated with NaCl Solutions under Freeze–Thaw Cycles

Effects of key parameters on fluidity and compressive strength of ultra‐high performance concrete

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