Effect of calcium chloride on portland cements and concretes

Rapp, Peter B.

doi:10.6028/jres.014.026

Cited by 16 publications

(8 citation statements)

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“…Note that the slight drop in strength for the CaCl2-4 series at 210 days and then the increase at 365 days is attributed to the variation in the material properties. The strength due to tricalcium silicate (alite) and dicalcium silicate (belite) increased, but the strength due to tricalcium aluminate decreased with the addition of calcium chloride [ 76 ]. Additionally, calcium chloride retards the hydration of tricalcium aluminate while acting as accelerator for the hydration of the silicate phases [ 77 ].…”

Section: Resultsmentioning

confidence: 99%

Impact of Laboratory-Accelerated Aging Methods to Study Alkali–Silica Reaction and Reinforcement Corrosion on the Properties of Concrete

Attar¹,

Gencturk

Aryan

et al. 2020

Materials

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This study focuses on two separate investigations of the main aging mechanisms: alkali–silica reactivity (ASR) and the corrosion of reinforcing steel (rebar) concrete, both of which may result in a premature failure to meet the serviceability or strength requirements of a concrete structure. However, these processes occur very slowly, spanning decades. The impact of direct chemical additives to fresh concrete to accelerate ASR and the corrosion of reinforcing steel on the fresh and hardened properties of the ensuing material are investigated to inform the potential use of chemicals in large-scale studies. The deterioration of reinforced concrete (RC) is determined by means of expansion, cracking, bulk diffusivity and surface resistivity measurements, and compressive, split tensile and flexural strength tests. The results indicate that the addition of sodium hydroxide and calcium chloride can effectively accelerate the crack formation and propagation in concrete due to ASR and the corrosion of rebar, respectively. The ASR-induced cracks maintained a constant crack width from 0.05 mm to 0.1 mm over the measurement period regardless of the intensity of aging acceleration. Adding 4% chloride by weight of cement for accelerating rebar corrosion resulted in an average crack that was 82% larger than in the case of ASR accelerated with the addition of sodium hydroxide. The addition of alkali resulted in an increase in early-age (7-day) strength. At a total alkali loading of 2.98 kg/m3, 3.84 kg/m3 and 5.57 kg/m3, the 28-day compressive strength of concrete decreased by 3%, 10% and 24%, respectively. Similarly, a higher early-age strength and a lower later-age strength was observed for the concrete in the presence of corrosive calcium chloride. The results from this research are expected to inform future studies on the long-term performance of RC structures under accelerated ASR and corrosion.

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Section: Resultsmentioning

confidence: 99%

Impact of Laboratory-Accelerated Aging Methods to Study Alkali–Silica Reaction and Reinforcement Corrosion on the Properties of Concrete

Attar¹,

Gencturk

Aryan

et al. 2020

Materials

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“…Though there has been disagreement over the use of calcium chloride in reinforced concrete in assessment of the possibility of corrosion. In many civil Engineering codes, its use is being prevented for concrete embedded metal [9]- [11]. Effect of temperature on the different properties of concrete is substantial.…”

Section: Introductionmentioning

confidence: 99%

Influence of Calcium Nitrite Based Accelerator, Steam Temperature and Pre-curing Time on the Compressive Strength of Mortar/Concrete

Malikyar¹,

Sudoh²,

Nakajima³

et al. 2018

IJET

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The purpose of this study is to investigate the effect of Calcium Nitrite based accelerators concentrated 45% weight, pre-curing time and steam curing temperature on the strength gain of mortar, in the early and later age. Hence an experimental investigation was conducted to determine the optimum dosage of mentioned accelerators, and proper pre-curing time. Tests were performed on the specimens from various mixes considering to the W/C ratio 30% and 40%. Accelerator admixture was added in four series (0, 0.5, 2 and 4) %, steam curing temperature was 65C°, and the pre-curing times were two patterns (pattern1 = 0.5 (hr) and the pattern2= 2.5(hr). Curing time was equal to both patterns that's 5 (hr). The compressive strength test has been performed on the early age (8, hr), and later age (7 and 28) days, the obtained result compared with the strength of control specimens. To make the better fluidity, water reducing admixture was added by 0.5% weight of cement. From the result of the experiment, it has been observed that high strength for early and later ages obtained for the specimens that made with 4% accelerator admixture and exposed to the longer pre-curing cycle.

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“…The transit time (∆t) refers to the propagation of the ultrasonic wave from the transmitter transducer across the cement medium to the receiver transducer and is the reciprocal of V as shown in Equation (2). Typical ∆t values for various materials are presented in Table 1 [12].…”

Section: Introductionmentioning

confidence: 99%

“…The adoption of calcium chloride (CaCl 2 ) as the accelerator has been considered in previous research for OPC. A previous study [12] investigated the effect of CaCl 2 on the compounds of OPC for 1, 7, and 28 days, and discovered that the addition of CaCl 2 to tricalcium silicate increased the cement strength for all durations, while the effect on dicalcium silicate on Day 1 was inappreciable. Meanwhile, the compressive strength of tricalcium aluminate increased on Day 1, but decreased on Day 7 and Day 28.…”

Section: Introductionmentioning

confidence: 99%

Reducing the Waiting-On-Cement Time of Geopolymer Well Cement using Calcium Chloride (CaCl2) as the Accelerator: Analysis of the Compressive Strength and Acoustic Impedance for Well Logging

et al. 2021

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Geopolymer cement (GPC) is an aluminosilicate-based binder that is cost-effective and eco-friendly, with high compressive strength and resistance to acid attack. It can prevent degradation when exposed to carbon dioxide by virtue of the low calcium content of the aluminosilicate source. The effect of the concentration of calcium chloride (CaCl2) as the accelerator on the compressive strength and acoustic impedance of GPC for well cement, while exposed to high pressure and high temperatures, is presented. Fly ash from the Tanjung Bin power plant, which is categorized as Class F fly ash according to ASTM C618-19, was selected as the aluminosilicate source for the GPC samples. Sodium hydroxide and sodium silicate were employed to activate the geopolymerization reaction of the aluminosilicate. Five samples with a density of 15 ppg were prepared with concentrations of CaCl2 that varied from 1% to 4% by weight of cement. Findings revealed that the addition of 1% CaCl2 is the optimum concentration for the curing conditions of 100 °C and 3000 psi for 48 h, which resulted in the highest compressive strength of the product. Results also indicate that GPC samples that contain CaCl2 have a smaller range of acoustic impedance compared to that of ordinary Portland cement.

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Effect of calcium chloride on portland cements and concretes

Cited by 16 publications

References 0 publications

Impact of Laboratory-Accelerated Aging Methods to Study Alkali–Silica Reaction and Reinforcement Corrosion on the Properties of Concrete

Impact of Laboratory-Accelerated Aging Methods to Study Alkali–Silica Reaction and Reinforcement Corrosion on the Properties of Concrete

Influence of Calcium Nitrite Based Accelerator, Steam Temperature and Pre-curing Time on the Compressive Strength of Mortar/Concrete

Reducing the Waiting-On-Cement Time of Geopolymer Well Cement using Calcium Chloride (CaCl2) as the Accelerator: Analysis of the Compressive Strength and Acoustic Impedance for Well Logging

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