دانلود رایگان مقاله لاتین سدیم کربنات ملات از سایت الزویر
عنوان فارسی مقاله:
مدل سازی تنظیم زمان و مقاومت فشاری در سدیم کربنات فعال شده ملات سرباره کوره بلند با استفاده از طراحی مخلوط های آماری
عنوان انگلیسی مقاله:
Modeling setting time and compressive strength in sodium carbonate activated blast furnace slag mortars using statistical mixture design
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
It has been estimated that cement production is responsible for about 5% of total anthropogenic carbon dioxide emissions [1]. Due to planetary concern about global climate change, interest in reducing the emissions associated with the cement industry has been growing. Alkali-Activated materials (AAMs) are a category of alternative cementitious materials that have been shown to reduce greenhouse gas emissions by up to 40% [2]. Studies have shown that AAMs can be used in building applications where Ordinary Portland Cement (OPC) would traditionally be used [3]. AAMs have exhibited better resistance to freeze-thaw cycles, higher mechanical strength and better resistance to acid attack than Portland cement based materials [4]. However, many AAMs set too fast to be used in applications where the material must be manipulated after the initial pour. Setting times for Sodium carbonate activated slag have been shown to be as much as two days longer than other common sodium based activators such as sodium hydroxide and sodium silicate [4]. In practice, the initial setting time of the material is more important than final setting time because the initial setting time determines when the material is still workable. In addition to setting time, it is necessary to maintain a certain minimum level of compressive strength if these materials are to be used. For some common applications like pavements and basement walls the minimum compressive strength requirements range from 17 to 24 MPa [5] depending on climate. With a wide range of setting times (30 min [6] to 3 days [4]) and compressive strengths (20e100 MPa [7]) reported in the literature for sodium carbonate activated blast furnace slag, further research is needed to deter- * Corresponding author. mine the combined effects of the ingredients on the AAMproperties. In the AAM literature when experimental design has been used, the Taguchi method [8,9], fractional factorial [10e12], and mixture design [7] have been used. Previous studies have also explored the effect of silicate modulus, activator concentration, curing temperature and type of activator on compressive strength [9,11]. In this study, individual mixture ingredients are used as the studied factors in order to determine statistically significant components in the mixture. Statistical Mixture design offers advantages over fractional factorial and Taguchi design methods because the amount of total material can be held constant. The purpose of the current work is to determine the relationships between two responses (initial setting time and compressive strength) and the mixture components in sodium carbonate activated blast furnace mortars.
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کلمات کلیدی:
Publications | Benjamin Varela | Rochester Institute of Technology https://people.rit.edu/bxveme/Publications.html ... Richard Hailstone,”Modeling setting time and compressive strength in sodium carbonate activated blast furnace slag mortars using statistical mixture design”, ... "Mechanical, Environmental and Economic Feasibility Analysis of ... scholarworks.rit.edu/theses/8960/ by K Ellis - 2015 - Related articles Nov 20, 2015 - The study concludes that sodium carbonate activated blast furnace slag ... standards for concrete initial setting time and compressive strength. [PDF]Influence of Sodium Oxide on Properties of Fresh and Hardened Paste ... old.profs.semnan.ac.ir/e_najafi/upload_file/art.1.pdf by A Allahverdi - Cited by 14 - Related articles metal hydroxides, carbonates or silicates in either ... dosage on setting times of sodium silicate- ... Hardened Paste of Alkali-Activated Blast-Furnace Slag ... Keywords: Blast Furnace Slag, Alkali-Activator, Compressive Strength, Shrinkage. Developments in Strategic Ceramic Materials: Ceramic Engineering and ... https://books.google.com/books?isbn=1119211735 Waltraud M. Kriven, Jingyang Wang, Thomas Fischer - 2016 - Science Compared in terms of compressive strength, various activators produce ... The use of sodium carbonate induces a long setting time, which is far from that of ... with hydroxide is the best way to have an alkali activation of blast furnace slag. [PDF]Performance of alkali activated slag with various alkali ... - IJIRSET https://www.ijirset.com/upload/february/7_C.pdf The fresh concrete properties studied were setting time and ... best; sodium carbonate was the second; and sodium hydroxide was third in ... and in terms of flexure strength and punching shear strength sodium ... Keywords: Alkali Activated Slag (AAS) Concrete, Ground Granulated Blast Furnace Slag, OPC, Compressive. Mechanical, Environmental and Economic Feasibility Analysis of ... search.proquest.com/openview/1064670f8e622f795bbfde282a7bf25e/1?pq...y by K Ellis - 2016 - Related articles This study examines initial setting time, compressive strength, environmental impact, and cost of sodium carbonate activated blast furnace slag as a function of ... [PDF]Role of carbonates in the chemical evolution of sodium carbonate ... eprints.whiterose.ac.uk/.../Bernal%20S.A.%20et%20al.%202014%20-%20Sodium%2... by SA Bernal - 2015 - Cited by 18 - Related articles Multi-technique characterisation of sodium carbonate-activated blast furnace slag ... consistent with a significant gain in compressive strength and reduced ... kinetics of Na2CO3-activated slag at early times of curing, enhancing the use of ...... of curing, but the setting and hardening reactions of the systems studied here is ...
