Guide for use of admixtures in concrete

Paillere, A M; Bassat, M. Ben; Akman, Süleyman

doi:10.1007/bf02472213

Cited by 8 publications

(6 citation statements)

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“…The set accelerator used was calcium nitrate and sodium thiocyanate based. Calcium nitrate accelerates the setting time and moderately accelerates hardening whereas sodium thiocyanate accelerates the strength gain (Paillère 1994). As reported by Rettvin and Dalen and cited by Cabrera et al (Cabrera and Rivera-Villarreal 1999) when calcium nitrate was used in combination with sodium thiocyanate, calcium nitrate started the hydration process earlier which was then hastened by sodium thiocyanate.…”

Section: Tga Xrd and Sem Analysismentioning

confidence: 84%

Micro and Nano Engineered High Volume Ultrafine Fly Ash Cement Composite with and without Additives

Roychand

Silva

Law

et al. 2016

Int J Concr Struct Mater

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This paper presents the effect of silica fume and nano silica, used individually and in combination with the set accelerator and/or hydrated lime, on the properties of class F high volume ultra fine fly ash (HV-UFFA) cement composites, replacing 80 % of cement (OPC). Compressive strength test along with thermogravimetric analysis, X-ray diffraction and scanning electron microscopy were undertaken to study the effect of various elements on the physico-chemical behaviour of the blended composites. The results show that silica fume when used in combination with the set accelerator and hydrated lime in HV-UFFA cement mortar, improves its 7 and 28 day strength by 273 and 413 %, respectively, compared to the binary blended cement fly ash mortar. On the contrary, when nano silica is used in combination with set accelerator and hydrated lime in HV-UFFA cement mortar, the disjoining pressure in conjunction with the self-desiccation effect induces high early age micro cracking, resulting in hindering the development of compressive strength. However, when nano silica is used without the additives, it improves the 7 and 28 day strengths of HV-UFFA cement mortar by 918 and 567 %, respectively and the compressive strengths are comparable to that of OPC.

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Section: Tga Xrd and Sem Analysismentioning

confidence: 84%

Micro and Nano Engineered High Volume Ultrafine Fly Ash Cement Composite with and without Additives

Roychand

Silva

Law

et al. 2016

Int J Concr Struct Mater

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“…When mixed with water, the cement grains tend to uptake part of the liquid. Polycarboxylate, acting as a dispersant, prevents this uptake and assures greater fluidity to the cement 22 . However, when in contact with PBS, it is possible that Biodentine has a greater quantity of water available, consequently presenting greater dispersion of particles, allowing the incorporation of air and facilitating the formation of pores, leading to cement displacement.…”

Section: Discussionmentioning

confidence: 99%

Influence of phosphate buffered saline on the bond strength of endodontic cement to dentin

et al. 2015

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Aim: To analyze the influence of exposure and time of exposure to phosphate buffered saline (PBS) on the push-out bond strength (BS) of Biodentine to dentine. Methods: Eighty 2-mm-thick dentin discs were obtained from transversal sections of human teeth roots. The space of the canal was enlarged using #2-#5 Gates-Glidden burs to obtain 1.3-mm-diameter standardized cavities. The discs were immersed in 17% EDTA followed by 1% NaOCl and dried. The spaces of the canals were filled with Biodentine and the samples were divided into 2 groups (n=40) according to the storage: G1: exposure to moistened cotton pellet; G2: exposure to PBS. After 30 min, 1, 3 and 28 days, 10 samples of each group were subjected to the push-out test. Data were analyzed using ANOVA and Tukey test (p < 0.05). Results: The specimens exposed to PBS had lower BS (p < 0.05), except for the 1-day period (p = 0.6017). In specimens of Group 1 the BS increased up to 3 days (p < 0.05). In specimens in Group 2, the BS increased from 30 min to 1 day (p < 0.0001) and remained stable up to 3 days (p = 0.9876). At 28 days, a significant decrease was observed in the BS values of both groups (p < 0.05). Conclusions: The exposure of Biodentine to PBS led to lower BS values. In general, the BS increased gradually up to 3 days and reduced at 28 days.

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“…This derives from their ability to confer numerous advantageous effects on concrete, namely increased workability, controlled setting, accelerated hardening, reduction of water necessity, improved strength/ductility, damp proofing, permeability reduction, corrosion inhibition, shrinkage reduction, freeze-thaw resistance or reduced carbonation, among others (Hewlett & Edmeades, 2004;Paillère, Ben Bassat, & Akman, 1992;Ramachandran, 1996). Over recent years, there has been increased concern for the environmental sustainability associated to cement production and usage.…”

Section: Introductionmentioning

confidence: 98%

Glycerol resulting from biodiesel production as an admixture for cement-based materials: an experimental study

Azenha

Lucas

Granja

et al. 2016

European Journal of Environmental and Civil Engineering

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Concrete admixtures are frequently expensive and may carry relevant ecological footprints, reason why there is a growing necessity and interest in finding cheaper and more sustainable alternatives. The present work focused on the evaluation of the potential benefits that might be harvested by adding a partially purified biodiesel byproduct as an admixture to cement-based materials. An experimental programme was carried out on several mixes of cement paste and mortar, incorporating the by-product in the cementitious mix in the following mass fractions (as a function of cement content): 0.5, 1 and 3%. Several testing techniques have been deployed for characterising material properties of the tested cement pastes and mortars, namely: flowability, setting time, compressive strength, elastic modulus, shrinkage and permeability. The obtained results led to the main observation that biodiesel-derived glycerol can be used as an accelerating admixture with the optimum mass faction of 1%.

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Guide for use of admixtures in concrete

Cited by 8 publications

References 0 publications

Micro and Nano Engineered High Volume Ultrafine Fly Ash Cement Composite with and without Additives

Micro and Nano Engineered High Volume Ultrafine Fly Ash Cement Composite with and without Additives

Influence of phosphate buffered saline on the bond strength of endodontic cement to dentin

Glycerol resulting from biodiesel production as an admixture for cement-based materials: an experimental study

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