Assessment of self-healing and durability parameters of concretes incorporating crystalline admixtures and Portland Limestone Cement

Azarsa, Pejman; Gupta, Rishi; Biparva, Alireza

doi:10.1016/j.cemconcomp.2019.02.017

Cited by 132 publications

(90 citation statements)

References 69 publications

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“…The morphologies of the specimens containing CWA materials showed that the formed crystals contributed significantly to reduce the total porosity, which confirmed the high performance of concrete containing CWA materials in practice. For the formed crystals, the other phase of C-S-H gel reduced the water transport of hardened concrete by partially blocking the pore structure [23,26,49]. This finding is also in agreement with Elsalamawy et al's study [23], which examines the available space in the matrix of mortars with CWA.…”

Section: Phase Isupporting

confidence: 88%

“…Only CWA treated mixtures satisfied a maximum penetration depth of 50 mm by having the average values of 40 mm for OPC-CWA and 25.7 mm for PLC-CWA [26]. When compared with OPC group, PLC concrete group indicated 20% and 37.5% lower water penetration depth for un-and CWA-treated, respectively [26]. The results showed significant lower water penetration depth and permeability coefficient for K treated concrete specimens compared to control ones.…”

Section: Phase Imentioning

confidence: 85%

“…A previous study by the authors [26] investigated the effects of a CWA admixture (K admixture in this case) on the permeability of concrete, using the DIN 1048 test method [37] to evaluate the effects of this product on permeability. Based on the permeability study, it is reported that K admixture can reduce the coefficient of permeability (COP) by more than 60%.…”

Section: Phase Imentioning

confidence: 99%

“…When two different mixtures (O and O-K which contain OPC cement type and K as the additive or L and L-K containing PLC cement type and K as the admixture) share similar mix properties except one variable (presence of CWA), it can be stated that reduction in the porosity leads to reduction in the permeability. To verify this, water permeability tests were conducted by the authors of [26] in accordance with the DIN 1048-part 5 standard [37]. Only CWA treated mixtures satisfied a maximum penetration depth of 50 mm by having the average values of 40 mm for OPC-CWA and 25.7 mm for PLC-CWA [26].…”

Section: Phase Imentioning

confidence: 99%

“…To verify this, water permeability tests were conducted by the authors of [26] in accordance with the DIN 1048-part 5 standard [37]. Only CWA treated mixtures satisfied a maximum penetration depth of 50 mm by having the average values of 40 mm for OPC-CWA and 25.7 mm for PLC-CWA [26]. When compared with OPC group, PLC concrete group indicated 20% and 37.5% lower water penetration depth for un-and CWA-treated, respectively [26].…”

Section: Phase Imentioning

confidence: 99%

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Inventive Microstructural and Durability Investigation of Cementitious Composites Involving Crystalline Waterproofing Admixtures and Portland Limestone Cement

2020

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The durability of a cement-based material is mainly dependent on its permeability. Modifications of porosity, pore-structure and pore-connectivity could have significant impacts on permeability improvement, which eventually leads to more durable materials. One of the most efficient solutions in this regard is to use permeability reducing admixtures (PRA). Among these admixtures for those structures exposed to hydro-static pressure, crystalline waterproofing admixtures (CWA) have been serving in the construction industries for decades and according to ACI 212—chemical admixtures’ report, it has proven its capability in permeability reduction and durability-enhancement. However, there is substantial research being done on its durability properties at the macro level but very limited information available regarding its microstructural features and chemical characteristics at the micro level. Hence, this paper presents one of the first reported attempts to characterize microstructural and chemical elements of hydration products for cementitious composites with CWA called K, P and X using Scanning Electron Microscopy (SEM). Backscattered SEM images taken from a polished-section of one CWA type—K—admixture were analyzed in ImageJ to obtain paste matrix porosity, indicating a lower value for the CWA-K mixture. X-ray analysis and SEM micrographs of polished sections were examined to identify chemical compositions based on atomic ratio plots and brightness differences in backscatter-SEM images. To detect chemical elements and the nature of formed crystals, the fractured surfaces of three different CWA mixtures were examined. Cementitious composites with K admixture indicated needle-like crystal formation—though different from ettringite; X and P admixtures showed sulfur peaks in Energy Dispersive Spectrum (EDS) spectra, like ettringite. SEM images and X-ray analyses of mixtures incorporating Portland Limestone Cement (PLC) indicated lower-than-average porosity but showed different Si/Ca and Al/Ca atomic ratios.

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Section: Phase Isupporting

confidence: 88%

Section: Phase Imentioning

confidence: 85%

Section: Phase Imentioning

confidence: 99%

Section: Phase Imentioning

confidence: 99%

Section: Phase Imentioning

confidence: 99%

See 3 more Smart Citations

Inventive Microstructural and Durability Investigation of Cementitious Composites Involving Crystalline Waterproofing Admixtures and Portland Limestone Cement

2020

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Cementitious materials with biological additive for enhanced durability in marine environment

Iovane,

Kim,

Tizzano

et al. 2023

ce papers

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Concrete structures suffer from cracking that leads to deterioration and shortening of service life. This is very critical for underwater structures, i.e., immersed bridge piles, immersed tunnel or submerged floating tunnels, which are consistently susceptible to ingress of harmful ions (chloride, sulphate and carbonate ions). Autonomous healing of concrete cracks can be beneficial to assure durability performance during the service life. In this context the paper presents a preliminary experimental activity carried out to study the self‐healing capacity of cementitious composites in marine environment. Four series of paste samples are prepared to evaluate the autonomous healing capabilities, achieved through biotic and abiotic additions. The experimental campaign is articulated in four phases, such as: specimen preparation; tests in compression; immersion in water; crack healing evaluation. The specimen performances are examined and compared in terms of mechanical strength and crack width healing over time. Results highlight the efficiency of the technology for crack healing.

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Comparative Studies on the Anti‐Corrosive Action of Waterproofing Agent and Plant Extract to Steel Rebar

Somai

Giri

Roka

et al. 2023

Macromolecular Symposia

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Reinforcement of steel rebar in concrete infrastructure practices for a long time, mostly to improve tensile strength as well their service time. However, shortcomings related to damage of reinforced concrete (RfC) infrastructures becomes the business of corrosion researchers over the past few years, primarily from a safety and economic perspective. In general, the steel‐reinforced concrete (SRC) infrastructures are porous, and thence water as well different atmospheric pollutant gases penetrate it, causing the corrosion damages of the rebar, which shorten the prolonged existence of the RfC structures. The research aims to differentiate the efficacy and prosperity of waterproofing chemicals and methanol extract of Mangifera indica plant leaves for controlling the RfC susceptibility using a half‐cell corrosion potential measurement method following ASTM standard. The methanolic extract of M. indica leaves and waterproofing agents show high anti‐corrosion characteristics and can prescribe for the protection of the RfC infrastructures. The corrosion controlling performance level of 1000 and 2000 ppm M. indica extracts on the steel rebars in concrete has higher than the additions of alike concentration of both the water‐repellents depend on open‐circuit corrosion potential (CoP) shifting values to a noble direction.

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Assessment of self-healing and durability parameters of concretes incorporating crystalline admixtures and Portland Limestone Cement

Cited by 132 publications

References 69 publications

Inventive Microstructural and Durability Investigation of Cementitious Composites Involving Crystalline Waterproofing Admixtures and Portland Limestone Cement

Inventive Microstructural and Durability Investigation of Cementitious Composites Involving Crystalline Waterproofing Admixtures and Portland Limestone Cement

Cementitious materials with biological additive for enhanced durability in marine environment

Comparative Studies on the Anti‐Corrosive Action of Waterproofing Agent and Plant Extract to Steel Rebar

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