Autogenous and drying shrinkage of mortars based on Portland and calcium sulfoaluminate cements

Sirtoli, Davide; Wyrzykowski, Mateusz; Riva, Paolo; Lura, Pietro

doi:10.1617/s11527-020-01561-1

Cited by 28 publications

(10 citation statements)

References 37 publications

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“…It is consistent with the shrinkage phenomenon of AAS containing WG for which a rapid early autogenous and drying shrinkage is typical [7,16,17]. In the case of H material, it can be stated that the shrinkage process is very similar to OPC materials [18]. The difference in shrinkage between the WG and H material origins from the hydration kinetics and pore size distribution which differ substantially for both materials [19,20].…”

Section: Resultssupporting

confidence: 74%

Pilot Study on Shrinkage and Fracture of Materials Based on the Alkali-Activated Slag: Influence of Curing Regime

Kucharczyková

Šimonová

Bílek

et al. 2023

J. Phys.: Conf. Ser.

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The paper presents the results of a pilot study focused on the shrinkage process and fracture parameters of two fine-grained materials prepared from ground granulated blast furnace slag and silica sand. Two different activators were used - liquid sodium silicate and sodium hydroxide. The components ratio and the activator dose were the same for both materials and were as follows: activator dose of 6% Na2O by the slag weight, 1% of lignosulfonate plasticizer, and the ratio of slag:water:sand of 1:0.45:3. All specimens matured at room temperature. For each material, four curing regimes were designed with respect to the potential application on-site (especially different upper surface treatment and demoulding time). The shrinkage measurement lasted more than 2.5 years, after which fracture tests were performed on the same sets of specimens. Although only a slight nuance was in designed curing conditions, the results showed different sensitivity of investigated materials and monitored parameters to the particular curing regimes.

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Section: Resultssupporting

confidence: 74%

Pilot Study on Shrinkage and Fracture of Materials Based on the Alkali-Activated Slag: Influence of Curing Regime

Kucharczyková

Šimonová

Bílek

et al. 2023

J. Phys.: Conf. Ser.

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“…In nonproprietary ternary blended systems, the proportions of the binder composition can be categorized in three forms—(i) PC‐rich system where PC amount is higher compared to CAC or CSA; (ii) CAC‐rich CAC–PC–C$ blended system where CAC amount is higher than PC, and (iii) CSA‐rich CSA–PC–C$ blended system where CSA amount is higher than PC. So far, most of the studies have investigated PC‐rich systems as shown in Figure 3 12,19,22,34,35,38,39,43,48,61,68–82 . Most of the previous studies were conducted on PC‐rich CAC or CSA systems.…”

Section: Binder Compositionmentioning

confidence: 99%

A critical review of the role of ettringite in binders composed of CAC–PC–C$ and CSA–PC–C$

2023

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Ettringite-accelerated binders composed of CAC-PC-C$ (calcium aluminate cement-Portland cement-calcium sulfate) and CSA-PC-C$ (calcium sulfoaluminate cement-Portland cement-calcium sulfate) have been used widely for indoor applications, such as self-leveling floor screeds, underlayment, and tile adhesives owing to their rapid setting, early strength gain, and shrinkage compensation properties. These properties also make these binders appealing candidates for outdoor rapid repair (e.g., highways, bridge decks, and airfield pavements). However, a central question remains: Does ettringite remain stable in outdoor exposure conditions? If so, which factors will contribute positively/negatively to the long-term stability of ettringite in these systems? To address these questions, this critical review presents the current state of knowledge regarding the hydration of ternary binders composed of CAC-PC-C$ and CSA-PC-C$ with respect to ettringite formation and the factors affecting the stability of ettringite thereafter. The purpose of this review paper is to synthesize and analyze current research regarding conditions that promote or deter ettringite stability, establish what information is missing, unclear, or contradictory, and identify remaining research needs to address the identified knowledge gaps.

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“…Similarly, the CSA mixture only released 0.01 mL/g of sample during the pore solution extraction procedure and the OPC and Blend mixtures released around 0.02 mL/g of sample. Greater self-desiccation has been well documented in CSA hydration and is a practical advantage for some building applications where "fastdrying" is desired [6]. Drying due to evaporation during sample storage and handling resulted in negligible mass loss.…”

Section: Interpreting the Electrical Propertiesmentioning

confidence: 99%

“…Ettringite binders rapidly consume water during hydration (e.g. internal drying), and this could lead to greater electrical resistivity than an OPC sample that maintains a higher internal relative humidity [6,7]. However, methods have been developed to correct for varying levels of saturation in resistivity measurements [8].…”

Section: Introductionmentioning

confidence: 99%

Factors Influencing the Electrical Properties of Ettringite Binders as Repair Materials

Tuinukuafe

Noor²,

Ideker³

et al. 2022

MATEC Web Conf.

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Ettringite binders are increasingly being used as rapid-repair materials to extend the service-life of reinforced concrete where rebar corrosion has caused deterioration and spalling. The transport properties of these ettringite binders are important in assessing the longevity of such repairs. This study demonstrates how the electrical properties of such binders can be interpreted to obtain meaningful results related to the transport properties. In addition to the pore solution chemistry, the degree of saturation in calcium sulfoaluminate (CSA) cement was found to be an important factor in the electrical properties since ettringite binders can have greater self-desiccation at earlier ages than ordinary portland cement (OPC). After one day of hydration, the electrical properties suggested that the CSA containing mixtures had greater pore network connectivity than the OPC mixture and this can be attributed to the varying phase compositions. Thermodynamic modelling confirmed a high amount of ettringite formation in the CSA system and a lower capillary water and capillary porosity associated with this. The lower internal relative humidity of ettringite binders should be considered when using electrical measurements to evaluate their transport properties since it increases the total electrical resistivity.

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Autogenous and drying shrinkage of mortars based on Portland and calcium sulfoaluminate cements

Cited by 28 publications

References 37 publications

Pilot Study on Shrinkage and Fracture of Materials Based on the Alkali-Activated Slag: Influence of Curing Regime

Pilot Study on Shrinkage and Fracture of Materials Based on the Alkali-Activated Slag: Influence of Curing Regime

A critical review of the role of ettringite in binders composed of CAC–PC–C$ and CSA–PC–C$

Factors Influencing the Electrical Properties of Ettringite Binders as Repair Materials

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