Microstructural behaviour and shrinkage properties of high-strength fiber-reinforced seawater sea-sand concrete

Vafaei, Davoud; Ma, Xing; Hassanli, Reza; Duan, Jinming; Zhuge, Yan

doi:10.1016/j.conbuildmat.2021.126222

Cited by 49 publications

(10 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the meantime, the open micro-pores in the framework were locked efficiently due to Friedel’s salt development in the grown specimens, which upgraded the mortar durability ( Figure 9 b,c).The specific physicochemical reactivity of the mortar produced in the study with SW and SS promisingly resisted the extreme case of seawater attack in terms of the cement type with >10% 3CaO·Al 2 O 3 content. The key findings on Friedel’s salt polymerization effect were also justified partly by Vafaei et al [ 12 , 13 ].…”

Section: Resultsmentioning

confidence: 71%

“…They pointed out that the appropriate mix design still achieved the needed strength and workability for the field concrete. Vafaei et al [ 12 , 13 ] studied the sorptivity and microstructural behaviors of the high-strength fiber-reinforced seawater and sea sand concrete. Their work reported that the total porosity of the concrete showed finer characteristics.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Promising Mortar Produced with Seawater and Sea Sand

2022

View full text Add to dashboard Cite

The aim of the study is the deep understanding of the essential reactivity of the environmentally friendly mortar by which its applicability can be justified. Created in the study was the environmentally friendly mortar, which helped relieve the increasing requirements on conventional building materials that are produced from exhausted freshwater and river sand nowadays. Seawater (SW) and sea sand (SS) collected from the Eastern Seas of China were used to produce the mortar at various ages, including 10-day, 33-day, and 91-day. Both the curing and working conditions of the mortar were natural marine ones. The physicochemical-mechanical behaviors were investigated using uniaxial compression tests (UCTs), Energy Dispersive Spectrometer (EDS), X-ray Diffraction (XRD), and thermal-field emission scanning electron microscopy (SEM) analysis to understand the essential reactivity of the mortar with age accumulation. The results indicated that hydration products and favorable components were generated promisingly in the mortar: the C-S-H (xCaO·SiO2·zH2O) development was certainly achieved in the critical environment during the curing and working period; the extensive generation of C-A-S-H (CaO·Al2O3·2SiO2·4H2O) helped densify the C-S-H grid, which caused the promising development of the uniaxial compression strength (UCS); the framework porosity of the mortar was restrained effectively due to the development of Friedel’s salt that re-bonded the interfacial cracks between SS and the hydration products with the age accumulation in the critical environment. Consequently, UCS and the resistance against damage of the mortar showed increasing behavior even in the critical environment. The study established Friedel’s salt working models and strength and damage models to interpret the physicochemical reactivity of the mortar as: the source of the strength and toughness was the proper polymerization between the native saline components and the hydration product mixture generated throughout the production, curing, and application without the leaching phenomenon. The novel models and interpretation of the physicochemical reactivity ensured the applicability of the mortar produced with SW and SS in the critical environment.

show abstract

Section: Resultsmentioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%

A Promising Mortar Produced with Seawater and Sea Sand

2022

View full text Add to dashboard Cite

show abstract

“…• Reduction in compressive strength after 7 days (Liu et al, 2021) • Reduced porosity due to large amounts of chloride ions, leading to increased carbonization resistance • Increased strength • Reduced compressive elastic modulus (Vafaei et al, 2022) • Finer pore size and lower porosity • Higher autogenous shrinkage • Increase in drying shrinkage strain…”

Section: Journal Of Sustainablementioning

confidence: 99%

Usage of Coal Fly Ash and Bottom Ash from Ash Ponds for Bricks and Precast Concrete Blocks – A Review

Yusop¹,

Suhatril²,

Hamid³

et al. 2022

JSCET

View full text Add to dashboard Cite

As larger amounts of coal are burned every day to produce electricity for a growing population, more coal ash is produced and stockpiled in large landfills and ash ponds. The ever-increasing stockpiles of unutilized Coal Fly Ash (CFA) and Bottom Ash (CBA) are a growing health and environmental concern. Studies have shown that communities living near ash ponds are subjected to an increased risk of respiratory illness, and the stockpiles can also potentially cause environmental pollution due to leachate. The potential utilization of CFA and CBA is to use them as natural aggregate substitutes for construction materials such as mortar, bricks and precast concrete. This paper aims to review recent studies on the usage of CFA and CBA in producing brick and precast concrete blocks, the changes in the properties of the CFA or CBA bricks and precast concrete blocks compared to control samples, as well as the effects of seawater intrusion into the concrete mix, which indicate the potential effects of using CFA and CBA stored in coastal ash ponds.

show abstract

“…Polypropylene microfiber (PP) is a widespread and affordable material since there is an overproduction of polypropylene in the world [33]. Studies on the use of PP fibers in the amount of 0.1-0.5% in cement composites are continuing, for example, reduction of shrinkage of concrete based on seawater and sea sand is shown in [34]. The strain-hardening behavior of composites based on inorganic binders with PP microfiber has not been sufficiently studied.…”

Section: Introductionmentioning

confidence: 99%

Strain Hardening of Polypropylene Microfiber Reinforced Composite Based on Alkali-Activated Slag Matrix

Smirnova

Pidal²,

Alekseev³

et al. 2022

Materials

View full text Add to dashboard Cite

A comparative study of the fracture features, strength and deformation properties of pseudo strain-hardening composites based on alkali-activated slag and Portland cement matrices with polypropylene microfiber was carried out. Correlations between their compositions and characteristics of stress–strain diagrams under tension in bending with an additional determination of acoustic emission parameters were determined. An average strength alkali-activated slag matrix with compressive strength of 40 MPa and a high-strength Portland cement matrix with compressive strength of 70 MPa were used. The matrix compositions were selected for high filling the composites with polypropylene microfiber in the amount of 5%-vol. and 3.5%-vol. ensuring the workability at the low water-to-binder ratios of 0.22 and 0.3 for Portland cement and alkali-activated slag matrices, respectively. Deformation diagrams were obtained for all studied compositions. Peaks in the number of acoustic signals in alkali-activated slag composites were observed only in the strain-softening zone. Graphs of dependence of the rate of acoustic events occurrence in samples from the start of the test experimentally prove that this method of non-destructive testing can be used to monitor structures based on strain-hardening composites.

show abstract

Microstructural behaviour and shrinkage properties of high-strength fiber-reinforced seawater sea-sand concrete

Cited by 49 publications

References 52 publications

A Promising Mortar Produced with Seawater and Sea Sand

A Promising Mortar Produced with Seawater and Sea Sand

Usage of Coal Fly Ash and Bottom Ash from Ash Ponds for Bricks and Precast Concrete Blocks – A Review

Strain Hardening of Polypropylene Microfiber Reinforced Composite Based on Alkali-Activated Slag Matrix

Contact Info

Product

Resources

About