Effects of seawater and supplementary cementitious materials on the durability and microstructure of lightweight aggregate concrete

Cheng, Shi; Shui, Zhonghe; Sun, Tao; Huang, Yun; Liu, Kaizhi

doi:10.1016/j.conbuildmat.2018.09.178

Cited by 64 publications

(27 citation statements)

References 46 publications

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“…Similar conclusions have been reported elsewhere, when lower FA contents were incorporated into composites (Mohammed et al 2004;Shaikh and Dobson 2019). Studies performed by Shi et al (2015) and Cheng et al (2018) have also confirmed the synergistic effects of MK and seawater, which lead to an improvement in the mechanical and microstructural properties of the concretes produced. However, very promising results have been reported when GGBFS, cement and seawater have been combined.…”

Section: Introductionsupporting

confidence: 88%

“…Similarly, Etxeberria and Gonzalez-Corominas (2018) have reported 11% higher 28-d compressive strength improvements in concrete containing slag-blended cement. Work undertaken by Cheng et al (2018) on the effects of adding 5 wt% and 10% of MK, as well as a combination of 10% of MK with 10% of GGBFS, have shown that increases in SCM content lead to substantial improvements in early and 28-day strength, with a range of improvement similar to that found in this study.…”

Section: Compressive Strength Of Cement Mortarssupporting

confidence: 78%

“…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). 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%.…”

Section: Thermogravimetric Analysismentioning

confidence: 59%

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

Sikora

Lootens²,

Liard³

et al. 2020

Appl Nanosci

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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.

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Section: Introductionsupporting

confidence: 88%

Section: Compressive Strength Of Cement Mortarssupporting

confidence: 78%

Section: Thermogravimetric Analysismentioning

confidence: 59%

See 1 more Smart Citation

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

Sikora

Lootens²,

Liard³

et al. 2020

Appl Nanosci

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“…Grafik Kuat Tekan Beton Curing Air Laut dan Air Tawar 28 Hari dan 56 Hari Air laut yang digunakan dalam penelitian ini memiliki pH 9 oleh sebab itu reaksi hidrasi fly ash lebih sempurna di dalam air laut dibandingkan dengan air tawar. Selain itu, air laut akan menyebabkan pembentukan kristal garam Friedel, sehingga dapat meningkatkan pH dan alkalinitas, serta mampu mempercepat hidrasi semen dan memberikan struktur beton yang lebih padat dengan pori-pori yang lebih kecil (Cheng et al, 2018). Selain itu penggunaan semen PCC juga mampu menahan pengaruh serangan sulfat dalam air laut, semen PCC masuk ke dalam semen tipe I yang mampu menahan sulfat dari air laut sebesar 10 -20 % (Maufida, 2018).…”

Section: Gambar 6 Perbandingan Kuat Tekan Dalam Air Lautunclassified

Pengaruh Perawatan Air Laut dan Air Tawar terhadap Kuat Tekan Beton Geopolymer yang Memadat Sendiri

Nurtanto

Rahayu²,

Wahyuningtyas³

2021

Rekayasa

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The replacement of 10% cement as pozzolan material with cementitious materials such as fly ash and rice husk ash aims to improve the quality and durability of concrete to aggressive environments, under normal environmental conditions fly ash and rice husk ash are able to improve the quality of concrete. Based on the review was conducted research on the influence of curing sea water and fresh water to strong press self-compacting concrete with fly ash and rice husk ash as a substitute for cement. Cylindrical test objects measuring 10 x 20 cm with strong concrete press testing at the age of 28 and 56 days to determine the durability of concrete to aggressive environments. The process of curing sea water affects the compressive strength as well as the durability of concrete at the age of 28 and 56 days. The highest average compressive strength increases by 19-24% from normal concrete.

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“…Aїtcin [1] suggested that the particle size of SCM for HPC should be 0.5 to 5.0 µm, which is finer than that of cement, for the sake of improving the packing density and avoiding too much of an increase in the surface area of the binder phase. Among the various SCMs, metakaolin (MK), which is an anhydrous calcined form of kaolinite generally ground to finer than cement, should be a good choice [2][3][4]. As a thermally activated amorphous mineral, MK is acquired through calcining kaolin clay at 700-800 • C, during which the kaolinite is dehydroxylated [5,6].…”

Section: Introductionmentioning

confidence: 99%

Cement Equivalence of Metakaolin for Workability, Cohesiveness, Strength and Sorptivity of Concrete

Chen

et al. 2020

Materials

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A series of concrete mixes with metakaolin (MK) content ranging from 0 to 30% and water/cementitious materials (W/CM) ratio varying from 0.30 to 0.50 were produced for performance testing. The results showed that adding MK up to 20% as ordinary Portland cement (OPC) replacement best improved the 28-day and 70-day cube strengths, whereas adding MK up to 30% as OPC replacement always increased the cohesiveness and decreased the sorptivity, but impaired the workability. Moreover, the cement equivalent factor (CEF), i.e. the equivalent mass of OPC per mass of MK added, for each performance attribute, including workability and cohesiveness, was evaluated. Whilst the actual CEF of MK was generally higher at a higher W/CM ratio and lower at a higher MK content, overall, the average CEFs were found to be 1.98, 2.17, 3.83, 1.93, 2.12, and 4.70 for slump, flow, cohesiveness, 28-day cube strength, 70-day cube strength, and sorptivity coefficient, respectively. These CEF values indicated that the MK is a highly effective cementitious material for improving the cohesiveness, strength, and durability. Moreover, it has been demonstrated that the CEFs for workability and cohesiveness are useful parameters in aiding the mix design of MK concrete.

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Effects of seawater and supplementary cementitious materials on the durability and microstructure of lightweight aggregate concrete

Cited by 64 publications

References 46 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

Pengaruh Perawatan Air Laut dan Air Tawar terhadap Kuat Tekan Beton Geopolymer yang Memadat Sendiri

Cement Equivalence of Metakaolin for Workability, Cohesiveness, Strength and Sorptivity of Concrete

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