Steel Corrosion Behavior in Light Weight Fly-Ash Based Alkali Activated Mortars

Published on Feb 22, 2021in Applied Sciences
· DOI :10.3390/APP11041908
Giulia Masi8
Estimated H-index: 8
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Abstract
References35
Newest
#1Frank Winnefeld (Empa: Swiss Federal Laboratories for Materials Science and Technology)H-Index: 51
#2Gregor J. G. Gluth (BAM: Bundesanstalt für Materialforschung und -prüfung)H-Index: 14
Last. John L. Provis (University of Sheffield)H-Index: 92
view all 15 authors...
The RILEM technical committee TC 247-DTA ‘Durability Testing of Alkali-Activated Materials’ conducted a round robin testing programme to determine the validity of various durability testing methods, originally developed for Portland cement based-concretes, for the assessment of the durability of alkali-activated concretes. The outcomes of the round robin tests evaluating sulfate resistance, alkali-silica reaction (ASR) and freeze–thaw resistance are presented in this contribution. Five different...
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#1Gregor J. G. Gluth (BAM: Bundesanstalt für Materialforschung und -prüfung)H-Index: 14
#2Gino Ebell (BAM: Bundesanstalt für Materialforschung und -prüfung)H-Index: 4
Last. Jürgen Mietz (BAM: Bundesanstalt für Materialforschung und -prüfung)H-Index: 11
view all 4 authors...
Chloride contents at the steel–mortar interface that initiate steel corrosion were determined for carbon steel in alkali‐activated fly ash mortar for three different exposure conditions: exposure to 1 M NaCl solution; leaching in deionized water and then exposure to 1 M NaCl solution; and leaching in deionized water, aging in air at 20°C and natural CO2 concentration, and then exposure to 1 M NaCl solution. For comparison, a Portland cement mortar, exposed to 1 M NaCl solution, was studied. The ...
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#1Rui M. Novais (University of Aveiro)H-Index: 24
#2Robert C. Pullar (University of Aveiro)H-Index: 45
Last. João A. Labrincha (University of Aveiro)H-Index: 63
view all 3 authors...
Abstract Geopolymer foams (highly porous materials) have emerged as one of the most exciting materials over the past few years due to their remarkable properties, low cost and green synthesis protocol, enabling their use in various high added-value applications. Review papers on porous geopolymers are uncommon, and the emphasis has been given to materials processing and properties, while the applications were only briefly addressed. This review aims to fill this gap by presenting a comprehensive...
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#1Yan-Guang Wu (WIT: Wuhan Institute of Technology)H-Index: 9
#2Bowen Lu (WIT: Wuhan Institute of Technology)H-Index: 2
Last. Wenjun WangH-Index: 1
view all 9 authors...
Abstract Geopolymers, combining some characteristics of organic polymers, cements and ceramics for its special poly-condensed network structure, have received extensive attention of the researchers as a green cementitious material because of favorable and unique characteristics. This study mainly presents an overview on the progress of geopolymers research and development in recent decades. The works on raw materials, geopolymerization kinetics, the applications development and challenges of geo...
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#1Lorenza Carabba (UNIBO: University of Bologna)H-Index: 6
#2Stephan Pirskawetz (BAM: Bundesanstalt für Materialforschung und -prüfung)H-Index: 6
Last. Maria Chiara Bignozzi (UNIBO: University of Bologna)H-Index: 28
view all 5 authors...
Abstract Alkali-activated fly ashes have been proposed for various applications where resistance against high temperatures is required, yet several details regarding the response of these materials to heat-exposure need to be clarified. In the present study, heat-induced cracking in fly ash-based alkali-activated pastes and lightweight mortars was analyzed by in-situ acoustic emission (AE) detection during complete heating-cooling cycles (up to ∼1100 °C), augmented by thermogravimetry and ex-sit...
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#1Caijun Shi (Hunan University)H-Index: 73
#2Bo Qu (Hunan University)H-Index: 1
Last. John L. Provis (University of Sheffield)H-Index: 92
view all 3 authors...
Abstract The development of low-carbon binders has been recognized as a means of reducing the carbon footprint of the Portland cement industry, in response to growing global concerns over CO 2 emissions from the construction sector. This paper reviews recent progress in the three most attractive low-carbon binders: alkali-activated, carbonate, and belite-ye'elimite-based binders. Alkali-activated binders/materials were reviewed at the past two ICCC congresses, so this paper focuses on some key d...
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#1Chamila Gunasekara (RMIT: RMIT University)H-Index: 12
#2David W. Law (RMIT: RMIT University)H-Index: 25
Last. Liam Ward (RMIT: RMIT University)H-Index: 11
view all 5 authors...
Abstract This study investigates the corrosion of reinforcement in geopolymer concrete manufactured from three different low calcium fly ashes from Australian power plants. The long term corrosion condition of embedded rebar in fly ash geopolymer concretes containing cast in chlorides (0–5%) subjected to wet-dry cycles, together with specimens exposed to ponding in 3% NaCl were examined. Half-cell potential and linear polarisation resistance techniques were used to measure corrosion up to 540 da...
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#1Lorenza Carabba (UNIBO: University of Bologna)H-Index: 6
#2Raffaela Moricone (UNIBO: University of Bologna)H-Index: 4
Last. Maria Chiara Bignozzi (UNIBO: University of Bologna)H-Index: 28
view all 5 authors...
Abstract Alkali activated lightweight mortars, obtained by room temperature activation of coal fly ash, were studied as passive fire protection systems for steel elements. Physical, mechanical and thermal properties were investigated as a function of the compositional Si/Al molar ratio and of the amount of lightweight aggregate and foaming agent. Experimental findings were used as input data to assess their fire resistance by finite volume simulations. Results pointed out that the optimized alka...
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#1Francesca Tittarelli (Marche Polytechnic University)H-Index: 23
#2Alessandra Mobili (Marche Polytechnic University)H-Index: 13
Last. Tiziano Bellezze (Marche Polytechnic University)H-Index: 20
view all 5 authors...
Abstract The corrosion behaviour of bare and galvanized steel reinforcements in geopolymeric and cementitious mortars, at three strength classes, has been investigated throughout the curing period and exposure to wet-dry cycles in 3.5% NaCl solution. During the curing, the high alkalinity of geopolymers prolongs the active state of both bare and galvanized steel. During the chloride exposure, fly ash geopolymers give the highest protection to reinforcements. The higher alkalinity of geopolymers ...
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#1Jinjie Shi (SEU: Southeast University)H-Index: 15
#2Jing Ming (SEU: Southeast University)H-Index: 11
Last. Wei Sun (SEU: Southeast University)H-Index: 64
view all 3 authors...
Abstract This study concerns the passivation behaviour and corrosion resistance of reinforcing steels in ordinary Portland cement (OPC) extract and alkali-activated slag (AAS) extract with chlorides. The electrochemical behaviour of steels in both extracts was monitored by various electrochemical measurements. Compared with OPC extract, less protective passive film was formed for steels in AAS extract without chlorides. However, much higher corrosion resistance was highlighted for steels exposed...
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Cited By1
Newest
#1Juan BoschH-Index: 5
#2Ulises MartinH-Index: 4
Last. David M. BastidasH-Index: 22
view all 5 authors...
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