Experimental study on sulfate resistance of concrete with recycled aggregate modified with polyvinyl alcohol (PVA)

Al-Baghdadi, Haider M.

doi:10.1016/j.cscm.2021.e00527

Cited by 27 publications

(20 citation statements)

References 44 publications

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“…One of the strategies is to use poly(vinyl alcohol) (PVA) because PVA has been known to increase the mechanical strength of a green body after it is sintered. PVA was also reportedly used in the fabrication of ceramic or inorganic nanofibers, self-healing gamma-shielding nanocomposites, polymers, membranes, − and concretes. , In the development of a super-performance concrete, it was discovered that the addition of PVA into the concrete increased the concrete’s compressive strength by 10% and flexural strength by over 26%. The increase in the mechanical strength was due to the growing physical friction and interlocking effect caused by the PVA as demonstrated in another work .…”

Section: Introductionmentioning

confidence: 99%

Freeze Granulation of Nanoporous UiO-66 Nanoparticles for Capture of Volatile Organic Compounds

Kim

Othman

2021

ACS Appl. Nano Mater.

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Nanoporous UiO-66 spherical beads prepared by using PVA binder successfully connected UiO-66 nanoparticles together into granular beads with improved mechanical strength for toluene capture. This was achieved without affecting the crystalline nature and micropore structures of the material. The regular octahedron of the UiO-66 individual nanoparticle remained intact, and the micropore size did not change with increasing PVA addition without which the nanoporous UiO-66 could not granulate into beads. However, PVA bound the nanoparticles together to form compact and cohesive network clusters that reduced the BET surface area and total pore volume. This consequently lowered the toluene adsorption efficacy slightly due to the premature breakthrough that limited the toluene molecular exposure into the micropores of the individual UiO-66 nanoparticles.

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Section: Introductionmentioning

confidence: 99%

Freeze Granulation of Nanoporous UiO-66 Nanoparticles for Capture of Volatile Organic Compounds

Kim

Othman

2021

ACS Appl. Nano Mater.

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“…When the expansion stress is greater than the tensile strength of concrete, the cracking of concrete capillaries produces microcracks, which eventually lead to changes in the mechanical properties of the concrete [6]. Previously, much research has been conducted on the performance damage to cement-based materials under the action of sulfate attack [7][8][9][10] and in recent years, dry-wet cycles and sulfate attacks have received the attention of many scholars [11][12][13]. Wei et al [14] researched the effect of fly ash on the mechanical properties and microstructure of fiber-reinforced concrete under the coupling of dry-wet cycles and sulfate attack, and the results showed that a composition of 20% fly ash enhanced the mechanical properties and refined the pores of the concrete samples.…”

Section: Introductionmentioning

confidence: 99%

Effect of Dry-Wet Cycles on the Transport and Mechanical Properties of Cement Mortar Subjected to Sulfate Attack

Chen¹,

Shan²,

Liang³

et al. 2023

Fluid Dynamics &Amp; Materials Processing

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This study deals with the analysis of the detrimental effects of a "sulfate attack" on cement mortar for different dry-wet cycles. The mass loss, tensile strength, and gas permeability coefficient were determined and analyzed under different exposure conditions. At the same time, nitrogen adsorption (NAD), scanning electron microscopy (SEM), and X-ray diffraction (XRD) techniques were used to analyze the corresponding variations in the microstructure and the corrosion products. The results show that certain properties of the cement mortar evolve differently according to the durations of the dry-wet cycles and that some damage is caused to the mortars in aqueous solution. The pores fill with corrosion products, increasing the mortar specimen mass and tensile strength while reducing the permeability coefficient and pore size distribution. As corrosion proceeds, the crystallization pressure of the corrosion products increases, resulting in a 16% reduction in tensile strength from the initial value and a 2.6-factor increase in the permeability coefficient, indicating sensitivity to sulfate attack damage. Furthermore, the main corrosion products generated in the experiment are gypsum and ettringite. Application of osmotic pressure and extension of the immersion time can accelerate the erosion process.

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“…Concrete and reinforced concrete products are not subjected to heat and moisture treatment during the manufacturing process, but harden under a waterproofing film to a grade strength of 28 days in atmospheric conditions (t = 35–50 °C) due to the hot dry climate of Iraq [ 66 ]. During the operation of products, the cement paste is no longer subjected to additional hydration due to the lack of the required amount of moisture [ 67 , 68 ].…”

Section: Introductionmentioning

confidence: 99%

Demolition Waste Potential for Completely Cement-Free Binders

Alani

Lesovik

et al. 2022

Materials

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Due to renovation and fighting in the world, a huge accumulation of construction and demolition waste is formed. These materials are effectively used as aggregates, but there is very little information about the use of scrap concrete to create cementless binders. The purpose of the work is to be a comprehensive study of the composition and properties of concrete wastes of various fractions with the aim of their rational use as cementless binders. The scientific novelty lies in the fact that the nature of the processes of structure formation of a cementless binder based on sandy fractions of the screening of fragments of destroyed buildings and structures, as a complex polyfunctional system, has been theoretically substantiated and experimentally confirmed. Different percentages of non-hydrated clinker minerals in concrete scrap were determined. In the smallest fraction (less than 0.16 mm), more than 20% of alite and belite are present. Waste of the old cement paste is more susceptible to crushing compared to the large aggregate embedded in it, therefore, particles of the old cement paste and fine aggregate predominate in the finer fractions of the waste. Comprehensive microstructural studies have been carried out on the possibility of using concrete scrap as a completely cementless binder using scanning electron microscopy, X-ray diffraction analysis, and differential thermal analysis. It has been established that for cementless samples prepared from the smallest fractions (less than 0.315 mm), the compressive strength is 1.5–2 times higher than for samples from larger fractions. This is due to the increased content of clinker minerals in their composition. The compressive strength of the cementless binder after 28 days (7.8 MPa), as well as the early compressive strength at the age of 1 day after steaming (5.9 MPa), make it possible to effectively use these materials for enclosing building structures.

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Experimental study on sulfate resistance of concrete with recycled aggregate modified with polyvinyl alcohol (PVA)

Cited by 27 publications

References 44 publications

Freeze Granulation of Nanoporous UiO-66 Nanoparticles for Capture of Volatile Organic Compounds

Freeze Granulation of Nanoporous UiO-66 Nanoparticles for Capture of Volatile Organic Compounds

Effect of Dry-Wet Cycles on the Transport and Mechanical Properties of Cement Mortar Subjected to Sulfate Attack

Demolition Waste Potential for Completely Cement-Free Binders

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