Behavior of blends of CSA and Portland cements in high chloride environment

Bertola, Federica; Gastaldi, Daniela; Irico, Sara; Paul, Geo; Canonico, Fulvio

doi:10.1016/j.conbuildmat.2020.120852

Cited by 36 publications

(14 citation statements)

References 49 publications

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“…Manufacture has spread to other countries in recent years, where CSA is often used as a component of blended cements for applications requiring high early-age strength [8]. C 4 A 3 $ + 2 C$H x + (38 − 2x) H → C 6 A$ 3 H 32 + 2 AH 3 x = 0, 0.5, 2 (ettringite formation) (1) According to some studies, when blended with PC, calcium sulfoaluminate cement may raise early-age mechanical strength, reduce shrinkage, control setting time, and improve frost resistance [9][10][11][12]. In CSA + PC blends, the calcium hydroxide released during PC hydration combines with C 4 A 3 $ and calcium sulfate to generate microcrystalline ettringite, which largely offsets shrinkage.…”

Section: Introductionmentioning

confidence: 99%

“…According to some studies, when blended with PC, calcium sulfoaluminate cement may raise early-age mechanical strength, reduce shrinkage, control setting time, and improve frost resistance [ 9 , 10 , 11 , 12 ]. In CSA + PC blends, the calcium hydroxide released during PC hydration combines with C 4 A 3 $ and calcium sulfate to generate microcrystalline ettringite, which largely offsets shrinkage.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Alkaline Salts on Calcium Sulfoaluminate Cement Hydration

et al. 2021

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This work analyzes the effect of the presence of 5 wt.% of solid sodium salts (Na2SO4, Na2CO3, and Na2SiO3) on calcium sulfoaluminate cement (CSA) hydration, addresses hydration kinetics; 2-, 28-, and 90-d mechanical strength, and reaction product microstructure (with X-ray diffraction (XRD), and Fourier transform infrared spectroscopy, (FTIR). The findings show that the anions affect primarily the reactions involved. Ettringite and AH3, are the majority hydration products, while monosulfates are absent in all of the samples. All three salts hasten CSA hydration and raise the amount of ettringite formed. Na2SO4 induces cracking in the ≥28-d pastes due to post-hardening gypsum and ettringite formation from the excess SO42– present. Anhydrite dissolves more rapidly in the presence of Na2CO3, prompting carbonation. Na2SiO3 raises compressive strength and exhibits strätlingite as one of its reaction products.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Alkaline Salts on Calcium Sulfoaluminate Cement Hydration

et al. 2021

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“…Xu et al [12] pointed out that CSA cement can significantly improve the microstructure of concrete and decrease the water absorption rate compared with OPC. Some other researches [4,[13][14][15] have also concluded that the CSA cement can reduce the porosity of concrete.…”

Section: Introductionmentioning

confidence: 97%

“…Wang et al [24] found that the concrete mixed with sweater develops more enriched hydrates and finer microstructure. Seawater contains a large number of ions (mainly chloride and sulfate ions), where it has been already recognized that it can influence the properties of concrete [13]. However, there exists a debate on the influence of seawater on the properties of concrete [25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Influence of Water‐Cement Ratio and Type of Mixing Water on the Early Hydration Performance of Calcium Sulphoaluminate (CSA) Cement

Wang

Song

2021

Advances in Materials Science and Engineering

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The present work studies the influence of water-cement ratio and types of mixing water on the hydration process and microstructure of calcium sulphoaluminate (CSA) cement. Experimental tests on the setting time, physical properties, compressive strength, chemical shrinkage, X-ray diffraction (XRD), and scanning electron microscopy (SEM) of CSA cement paste were carried out. The XRD analysis confirmed that the main hydration product is ettringite in both freshwater and seawater mixed CSA cement with different w/c ratios. The SEM analysis and physical properties test show that both low w/c ratio and seawater can improve the microstructure of CSA cement. The test results also find out that the high w/c ratio can accelerate the hydration process, extend the setting time, lower the compressive strength, and increase the chemical shrinkage of CSA cement, and the seawater presents a similar influence except for the mechanical property. The seawater increases the compressive strength of CSA cement in the early stage of hydration but will increase the microcracks at the later hydration stage of CSA cement and reduce its mechanical properties.

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“…Relative to its use in wet environments, CSA cements containing gypsum in their constitution can undergo overexpansion. Conversely, CSAbased binders show high mechanical performance and deceleration of salts intrusion with a high chloride content, which can be an advantage in the case of marine exposure [13,14].…”

Section: Introductionmentioning

confidence: 99%

Performance and Durability of Rendering and Basecoat Mortars for ETICS with CSA and Portland Cement

Trigo

Flores‐Colen

Silva³

et al. 2021

Infrastructures

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The production of Portland cement (OP) is commonly associated to significant level of energy consumption and gas emissions. The use of calcium sulfoaluminate cement (CSA) can be a sustainable alternative binder, since its production releases about half of the CO2 emissions and its clinker requires 200 °C lower temperatures, when compared to OP. Furthermore, CSA has fast setting time and achieves higher strength in shorter periods, as well as reduced shrinkage. This paper discusses the incorporation of CSA in rendering mortars and basecoat mortars for ETICS (External Thermal Insulation Composite Systems). The physical-mechanical properties of mortars made with OP and CSA cements were experimental evaluated. The results showed that the introduction of CSA generally improves shrinkage, compressive strength, water absorption at low pressure, enhances the tensile bending strength and decreases the setting time. The amount of CSA introduced into the mixture significantly affected the properties of the cement matrix.

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Behavior of blends of CSA and Portland cements in high chloride environment

Cited by 36 publications

References 49 publications

Effect of Alkaline Salts on Calcium Sulfoaluminate Cement Hydration

Effect of Alkaline Salts on Calcium Sulfoaluminate Cement Hydration

Influence of Water‐Cement Ratio and Type of Mixing Water on the Early Hydration Performance of Calcium Sulphoaluminate (CSA) Cement

Performance and Durability of Rendering and Basecoat Mortars for ETICS with CSA and Portland Cement

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