Hydration, Pore Solution, and Porosity of Cementitious Pastes Made with Seawater

Montanari, Luca; Suraneni, Prannoy; Tsui-Chang, Marisol; Khatibmasjedi, Morteza; Ebead, Usama; Weiss, Jason; Nanni, Antonio

doi:10.1061/(asce)mt.1943-5533.0002818

Cited by 87 publications

(62 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…At up to 28 days of curing, the CH content in specimens mixed with seawater was higher than when compared to freshwater mixed specimens. A similar observation was reported by Montanari et al (2019), where fly ash-blended cement paste mixed with seawater exhibited a gradual increment in CH content, until up to 28 days of hydration, with the amount of CH at later ages decreasing, due to the pozzolanic reaction of fly ash. Surprisingly, in the case of slag-blended cement (Fig.…”

Section: Thermogravimetric Analysissupporting

confidence: 87%

“…After 7 days of curing, Friedel's salt content in specimens 0SW-P, 3SW-S, 0SW-S and 3SW-S ranged from 1.4 to 1.83%, while after 28 days of curing the amount increased and ranged from 2.2 to 2.5%. This range is in line with Montanari et al (2019) and confirms Fig. 11 Calcium hydroxide content after 2, 7 and 28 days of curing in pozzolan-blended (a) and slag-blended (b) cement the occurrence of the chloride immobilization process in the hydrating cement matrix.…”

Section: Thermogravimetric Analysissupporting

confidence: 85%

“…Although accurate quantification of Friedel's salt content from TG is complex, due to the overlapping ranges of thermal decomposition of the constituent parts of other pastes (Shi et al 2017;Montanari et al 2019), the TG method can be adapted for tracking specimens' general trends. Friedel's salt content (% by weight of paste) was determined from TG curves, based on the mass loss between 230 and 380 °C (Montanari et al 2019). Similarly to other research (Parthasarathy et al 2017;Cheng et al 2018;Wang et al 2018;Bertola et al 2019), in this study Friedel salt's was not detected in the early days of hydration (2 days).…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

“…Also, most of the available studies have focused on plain OPC systems. It is widely agreed that seawater has an accelerating effect of cement hydration processes (Govindarajan and Gopalakrishnan 2011;Li et al 2018a;Younis et al 2018;Montanari et al 2019;Sikora et al 2019b) and contributes to a decrease in the setting time and workability of concrete (Etxeberria et al 2016b;Younis et al 2018;Li et al 2019;Teng et al 2019). Early strength improvement, as an effect of accelerated cement hydration, has been widely reported (Demir et al 2010;Wegian 2010;Otsuki et al 2012;Abdel-Magid et al 2016;Etxeberria et al 2016a;Li et al 2018a).…”

Section: Introductionmentioning

confidence: 99%

“…After 28 days of curing, the effects of seawater in OPC-based concrete are considered to be minor and strength improvements (if at all observable) are generally limited to 5-10%, with long-term mechanical performance being reported as slightly lower than that of OPC-based concrete produced with freshwater (Mbadike and Elinwa 2011;Etxeberria and Gonzalez-Corominas 2018;Guo et al 2018;Bertola et al 2019). Moreover, a refinement in pore structure and an improvement in the permeability of seawater-mixed composites has been reported (Ishikawa et al 2014;Khatibmasjedi et al 2019;Montanari et al 2019;Sikora et al 2019b).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

The effects of seawater and nanosilica on the performance of blended cements and composites

Sikora

Lootens²,

Liard³

et al. 2020

Appl Nanosci

View full text Add to dashboard Cite

This study investigates the effects of seawater and nanosilica (3% by weight of cement), on the fresh and hardened properties of cement pastes and mortars produced with two types of low heat cements: Portland pozzolana cement (CEM II) and blast furnace cement (CEM III). The heat of hydration, initial and final setting times, rheological properties, strength development, sorptivity and water accessible porosity of the cement pastes and mortars were determined. The data reveal that cement type has a significant effect on the reaction rate of cement with seawater and nanosilica (NS). Specimens produced with slag-blended cement exhibited a higher cement reaction rate and the composite produced exhibited better mechanical performance, as a result of the additional reaction of alumina rich phases in slag, with seawater. Replacement of freshwater with seawater contributes mostly to a significant improvement of early strength. However, in the case of slag-blended cement, 28 day strength also improved. The incorporation of NS results in additional acceleration of hydration processes, as well as to a decrease in cement setting time. In contrast, the addition of NS results in a noticeable increment in the yield-stress of pastes, with this effect being pronounced when NS is mixed along with seawater. Moreover, the use of seawater and NS has a beneficial effect on microstructure refinement, thus improving the transport properties of cement mortars. Overall, the study has showed that both seawater and NS can be successfully used to accelerate the hydration process of low heat blended cements and to improve the mechanical and transport properties of cement-based composites.Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

show abstract

Section: Thermogravimetric Analysissupporting

confidence: 87%

Section: Thermogravimetric Analysissupporting

confidence: 85%

Section: Thermogravimetric Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The effects of seawater and nanosilica on the performance of blended cements and composites

Sikora

Lootens²,

Liard³

et al. 2020

Appl Nanosci

View full text Add to dashboard Cite

show abstract

Shear performance degradation of basalt fiber‐reinforced polymer bars in seawater environments: Coupled effects of seawater sea‐sand geopolymer mortar coatings and sustained loading

Jiang,

Zhao,

Xie

et al. 2023

Polymer Composites

View full text Add to dashboard Cite

Geopolymers, as a promising substitute for ordinary cement, exhibit different coating effects with regard to the durability of basalt fiber‐reinforced polymer (BFRP) bars. In this study, a comparative investigation was carried out on the shear performance of prestressed BFRP bars coated with seawater sea‐sand geopolymer mortar (SSGM). The alkaline content of the SSGM was 4% or 6%. The prestress level was 20% of the ultimate tensile strength at room temperature. The immersion temperatures were room temperature (RT), 40, or 60°C. Interlaminar shear tests and transverse shear tests were conducted at each period (30, 60, 120, and 240 days). The results showed that BFRP bar coated with 6% alkaline content exhibited a slightly higher degradation of shear strength. Furthermore, the prestress developed microcracks in the bars and weakened the interface between the fiber and resin matrix, particular at the elevated temperature. This led to further degradation of the BFRP bars. Additionally, a comparison was made between the shear strength results of BFRP bars coated with SSGM and those coated with ordinary portland concrete or seawater sea‐sand concrete, revealing that the long‐term shear performance of BFRP bars was less negatively impacted by the SSGM coating.Highlights Coupled effects of SSGM coatings and sustained loading on the degradation of BFRP bars are investigated. SSGM provides better protection for BFRP bars than cement‐base concrete. Alkaline content of activator in SSGM has insignificant impact on the BFRP degradation.

show abstract

Evaluation of the Pore Characteristics and Microstructures of Concrete with Fly Ash, Limestone-Calcined Clay, Seawater, and Sea Sand

Liu²,

Jin³

et al. 2022

Arab J Sci Eng

View full text Add to dashboard Cite

Hydration, Pore Solution, and Porosity of Cementitious Pastes Made with Seawater

Cited by 87 publications

References 28 publications

The effects of seawater and nanosilica on the performance of blended cements and composites

The effects of seawater and nanosilica on the performance of blended cements and composites

Shear performance degradation of basalt fiber‐reinforced polymer bars in seawater environments: Coupled effects of seawater sea‐sand geopolymer mortar coatings and sustained loading

Evaluation of the Pore Characteristics and Microstructures of Concrete with Fly Ash, Limestone-Calcined Clay, Seawater, and Sea Sand

Contact Info

Product

Resources

About