دانلود رایگان مقاله لاتین اثربخشی هگزیتول در هیدراتاسیون فاز سیلیکات سیمان از سایت الزویر
عنوان فارسی مقاله:
به تعویق انداختن اثربخشی هگزیتول در هیدراتاسیون فاز سیلیکات سیمان: تعامل با آلومینات و مراحل سولفات
عنوان انگلیسی مقاله:
Retarding effectiveness of hexitols on the hydration of the silicate phases of cement: Interaction with the aluminate and sulfate phases
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Ordinary Portland Cement (OPC) is composed of silicate, aluminate and sulfate phases which interact between each other during its hydration. Alite (impure tricalcium silicate, C3S) and belite (C2S) are the silicate phases mainly composing OPC and are responsible for its setting. The latter can be retarded by using chemical admixtures such as lignosulfonates, carbohydrates and sugar derivatives. Although used since decades, these organic additives are often considered from a performance point of view by focusing on their retarding effectiveness on the setting time of OPC [1–9]. Nevertheless, with the diversity of existing cements and with the increasing levels of Supplementary Cementitious Materials of cement in modern concrete, the knowledge on the interactions between chemical admixtures and mineral surfaces and their influence on the hydration mechanisms of cement seems to be a subject of priority [10,11]. The retarding effect generated by several polysaccharides (dextrin, starch) and saccharides derivatives (D-gluconate, D-glucitol) on the hydration of OPC were reported to be sensitive to its composition and particularly to its aluminate content [1,4,8]. Several setting retarders were also shown to be adsorbed on aluminate hydrates [1,12,13]. Moreover, the presence of D-gluconate was also revealed to enhance the concentration of aluminate ions during the hydration of OPC in suspension [1]. Hence, some setting retarders change the ionic composition of the solution and interact with aluminate hydrates when hydrating OPC. However, the impacts of the different interactions of the organic molecules with the aluminate phases of OPC on the hydration of its silicate phases are not well identified and understood. This present study intends to contribute to fill this gap of knowledge by focusing on the interactions of hexitols during the hydration of a white cement and on their effects on the hydration rate of its silicate phases. Table 1 details the structure of the organic molecules studied that are D-glucitol, D-galactitol and D-mannitol which differ from one another in the stereochemistry of their hydroxyl groups. The retarding effects of these organic molecules on the hydration of pure C3S and of the silicate phases present in cement were first identified by isothermal calorimetry and compared. Secondly, the influence of the aluminate content of cement on the retardation caused by hexitols on the hydration of its silicate phases was assessed. Thirdly, the consumption of these sugar alcohols during the hydration of cement was revealed by Total Organic Carbon measurement. Then, the impacts of these organic compounds on the ionic concentration of cement and C3S suspensions measured using the Inductively Coupled Plasma – Atomic Emission Spectroscopy are compared. Finally, the relation between the different interactions of hexitols relative to the aluminate phase of cement and their retarding effect on the hydration of its silicate phases are discussed.
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کلمات کلیدی:
Retarding effectiveness of hexitols on the hydration of the silicate ... https://www.researchgate.net/.../308907107_Retarding_effectiveness_of_hexitols_on_th... Dec 9, 2016 - Retarding effectiveness of hexitols on the hydration of the silicate phases of cement: Interaction with the aluminate and sulfate phases on ... [PDF]Retarding effectiveness of hexitols on the hydration of the silicate ... iranarze.ir/wp-content/uploads/2016/11/E2920.pdf Oct 5, 2016 - hexitols relative to the aluminate phase of cement and their retarding ... by the hydration of the silicate phase whereas for cement, it reveals the. Hydration Process of Cement in the Presence of a Cellulosic Additive ... pubs.acs.org/doi/abs/10.1021/jp050237n by F Ridi - 2005 - Cited by 37 - Related articles Jul 7, 2005 - In the case of the aluminous phases, the additive inhibits the growth of stable cubic ... Effects of hexitols on the hydration of tricalcium silicate. Retarding effectiveness of hexitols on the hydration of the silicate ... isi-dl.com/item/140429 Retarding effectiveness of hexitols on the hydration of the silicate phases of cement: Interaction with the aluminate and sulfate phases. sciencedirect.com ... Effects of Saccharide Set Retarders on the Hydration of Ordinary ... onlinelibrary.wiley.com/doi/10.1111/j.1551-2916.2009.03378.x/abstract by L Zhang - 2010 - Cited by 30 - Related articles Oct 29, 2009 - Effects of Saccharide Set Retarders on the Hydration of Ordinary Portland Cement and Pure Tricalcium Silicate ... 2. Retarding effectiveness of hexitols on the hydration of the silicate ... en.nankai.findplus.cn/n_index_findplus_en.php?h=articles... - Translate this page Title: Retarding effectiveness of hexitols on the hydration of the silicate phases of cement: Interaction with the aluminate and sulfate phases. Authors: Nalet, C. Nanocem - Influence of the Functionalities of Organic Molecules on ... www.nanocem.org/.../Influence-of-the-Functionalities-of-Organic-Molecules-on-the-... 10.1016/j.cemconres.2016.11.004. Camille Nalet, André Nonat, Retarding effectiveness of hexitols on the hydration of the silicate phases of cement: Interaction ... Nanocem - Publications www.nanocem.org/index.php?mact=Projects,cntnt01...0... 10.1016/j.cemconres.2016.11.004. Camille Nalet, André Nonat, Retarding effectiveness of hexitols on the hydration of the silicate phases of cement: Interaction ... [PDF]Full-Text PDF - MDPI www.mdpi.com/1996-1944/10/4/369/pdf by M Hu - 2017 Mar 31, 2017 - phase is the dispersed phase, the core of the capsules will be hydrophilic, ...... of hexitols on the hydration of the silicate phases of cement:.
