Hydration characteristics of calcium sulfoaluminate (CSA) cement/portland cement blended pastes

Park, Solmoi; Jeong, Yeonung; Moon, Juhyuk; Lee, Namkon

doi:10.1016/j.jobe.2020.101880

Cited by 23 publications

(22 citation statements)

References 49 publications

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“…Apart from the exothermic main peak, an intermediate peak can be noticed between the initial peak and the second peak. As reported in [47], the intermediate peak is likely related to the formation of AFt/AFm or the dissolution of C 4 A 3 S. The intermediate peak occurs later as the OPC/CSA ratio increases from 1/9 to 5/5. Conversely, the higher the CS content is, the earlier the appearance of the intermediate peak is, and this can be ascribed to the reaction of AFt transforming into AFm in the absence of calcium sulfate [48].…”

Section: Hydrationsupporting

confidence: 60%

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Factors Influencing the Hydration, Dimensional Stability, and Strength Development of the OPC-CSA-Anhydrite Ternary System

Yang

Ye²,

Yuan

et al. 2021

Materials

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Due to the advantages of high early strength and rapid setting, ternary systems consisting of ordinary Portland clinker (OPC), calcium sulphoaluminate (CSA) clinker, and anhydrite have broad application prospects. However, further studies need to be undertaken to find a more optimal mixing proportion of this ternary binder in order to meet basic performance requirements. In this paper, isothermal calorimetric tests, chemical shrinkage tests, drying shrinkage tests, and compressive strength tests were carried out to systematically identify the effect of the OPC/CSA ratio and anhydrite dosage on the hydration, mechanical property development, and dimensional stability of ternary binders. It was found that a higher CSA content leads to a higher cumulative hydration heat, a shorter acceleration period, and a delayed induction period, which can be ascribed to the retardation of C3S at a high aluminate concentration. However, a higher addition of anhydrite can retard the main peak of hydration despite promoting the intermediate peak and improving the hydration reaction rate. The drying shrinkage of blends decreases first along with the CSA proportion and then increases. Moreover, a higher anhydrite content mitigates the drying shrinkage and hinders the strength development. Finally, considering the properties of both the fresh and hardened binder, the ternary blends with 5% anhydrite and OPC/CSA ratios ranging from 3/7 to 2/8 were identified as most suitable for applications that require a high early strength, stable late strength, and small level of shrinkage.

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Section: Hydrationsupporting

confidence: 60%

Section: Hydrationsupporting

confidence: 59%

Factors Influencing the Hydration, Dimensional Stability, and Strength Development of the OPC-CSA-Anhydrite Ternary System

Yang

Ye²,

Yuan

et al. 2021

Materials

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“…The obtained results showed some correlations with the predicted porosity, suggesting that higher water demand leads to generating lower porosity in the matrix. It is advisable that more water is added to the mixtures incorporating CAC or CSA in replacement of PC, because these binders are predicted to consume more water; otherwise, they are known to cause expansion at later ages due to the hydration of anhydrous clinkers at hardened states [26,33,34]. It is important that the results reported in this work should be cross-checked with the test results before being implemented in practice.…”

Section: Discussionmentioning

confidence: 99%

“…The cement denotes PC, which was gradually replaced by either CAC, CSA, MK or BFS in the simulation. The compositions ( Table 2 ) and reaction degrees of the binders reported in previous studies were used (PC [ 26 ], CAC [ 27 ], CSA [ 26 ], MK [ 28 ] and BFS [ 29 ]). The phase assemblages of UHPC mixtures incorporating PC, CAC, CSA, MK or BFS were predicted using GEM-Selektor v3.7 [ 30 , 31 ] and Cemdata18 [ 32 ].…”

Section: Methodsmentioning

confidence: 99%

Modeling the Effect of Alternative Cementitious Binders in Ultra-High-Performance Concrete

Park

Lee

et al. 2021

Materials

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The use of alternative cementitious binders is necessary for producing sustainable concrete. Herein, we study the effect of using alternative cementitious binders in ultra-high-performance concrete (UPHC) by calculating the phase assemblages of UHPC in which Portland cement is replaced with calcium aluminate cement, calcium sulfoaluminate cement, metakaolin or blast furnace slag. The calculation result shows that replacing Portland cement with calcium aluminate cement or calcium sulfoaluminate cement reduces the volume of C-S-H but increases the overall solid volume due to the formation of other phases, such as strätlingite or ettringite. The modeling result predicts that using calcium aluminate cement or calcium sulfoaluminate cement may require more water than it would for plain UHPC, while a similar or lower amount of water is needed for chemical reactions when using blast furnace slag or metakaolin.

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“…Numerous studies have employed thermodynamic modelling in assessing phase changes in Portland cement systems with mineral additions such as limestone, clay, fly ash, and slag [ 15 , 16 , 17 , 18 , 19 , 20 , 21 ]. Thermodynamic simulations were also applied to predict the hydrate assemblage in alternate cements such as calcium sulfoaluminate cements [ 22 , 23 , 24 , 25 , 26 ] and alkali-activated slag systems [ 27 , 28 , 29 ]. In addition, thermodynamic calculations are very convenient for assessing the durability performance of cementitious systems.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Modeling Study of Carbonation of Portland Cement

2022

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The assessment of the extent of carbonation and related phase changes is important for the evaluation of the durability aspects of concrete. The phase assemblage of Portland cements with different clinker compositions is evaluated using thermodynamic calculations. Four different compositions of cements, as specified by ASTM cements types I to IV, are considered in this study. Calcite, zeolites, and gypsum were identified as carbonation products. CO2 content required for full carbonation had a direct relationship with the initial volume of phases. The CO2 required for portlandite determined the initiation of carbonation of C-S-H. A continual decrease in the pH of pore solution and a decrease in Ca/Si is observed with the carbonation of C-S-H. Type II cement exhibited rapid carbonation at relatively less CO2for full carbonation, while type III required more CO2 to carbonate to the same level as other types of cement. The modeling of carbonation of different Portland cements provided insights into the quantity of CO2 required to destabilize different hydrated products into respective carbonated phases.

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Hydration characteristics of calcium sulfoaluminate (CSA) cement/portland cement blended pastes

Cited by 23 publications

References 49 publications

Factors Influencing the Hydration, Dimensional Stability, and Strength Development of the OPC-CSA-Anhydrite Ternary System

Factors Influencing the Hydration, Dimensional Stability, and Strength Development of the OPC-CSA-Anhydrite Ternary System

Modeling the Effect of Alternative Cementitious Binders in Ultra-High-Performance Concrete

Thermodynamic Modeling Study of Carbonation of Portland Cement

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