Durability and Testing – Chemical Matrix Degradation Processes

Abora, Kofi; Beleña, Irene; Bernal, Susan A.; Dunster, Andrew; Nixon, Philip A.; Provis, John L.; Tagnit-Hamou, Arezki; Winnefeld, Frank

doi:10.1007/978-94-007-7672-2_8

Cited by 17 publications

(18 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

Section: Introductionmentioning

confidence: 99%

“…Many different variables have been studied including sample type, sample size, acid type and acid severity [35]. There are also many testing procedures and degradation indicators employed making it difficult to draw comparisons between studies [35]. Additionally, many studies only consider a single deterioration mechanism and few studies consider multiple indicators of deterioration which is necessary when studying different binder types.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of slag content and activator dosage on the resistance of fly ash geopolymer binders to sulfuric acid attack

Aiken

Kwasny

Sha

et al. 2018

Cement and Concrete Research

231

View full text Add to dashboard Cite

Geopolymer (GP) binders are an appealing alternative to Portland cement (PC) binders as they have the potential to reduce the CO 2 emissions associated with the cement and concrete industry. However, their durability in aggressive environments needs thorough examination if they are to become a viable alternative to traditional Portland cement (PC) materials. This study investigated the effect of increasing slag content and activator dosage on the sulfuric acid resistance of fly ash GP binders. Their performance was also compared with that of neat PC mixes using various physical and microstructural techniques. The results show that increasing the slag content of fly ash GPs decreases porosity, but makes the reaction products more susceptible to sulfuric acid attack. It was also found that increasing the alkaline activator dosage of fly ash GPs has little impact on sulfuric acid resistance. Finally, GP binders displayed superior sulfuric acid resistance than their PC counterparts.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of slag content and activator dosage on the resistance of fly ash geopolymer binders to sulfuric acid attack

Aiken

Kwasny

Sha

et al. 2018

Cement and Concrete Research

231

View full text Add to dashboard Cite

show abstract

“…Decalcification occurred upon exposure to MEA, and significant carbonation occurred upon exposure to K 2 CO 3 . However, the mechanisms controlling chemical resistance in an aluminosilicate geopolymeric gel will be expected to be different, based on the very different degree of cross-linking in the silicate binder gels (Duxson et al, 2007a;Abora et al, 2014). This paper will describe the chemical characterisation of geopolymer paste samples during exposure to lean carbon capture solvents, through elemental analysis of the leaching solutions and X-ray diffractometry (XRD) of the pristine and leached Table 2 Component molar oxide ratios, NaOH concentrations and water/binder ratios (w/b; 'binder' is defined as the solid aluminosilicate precursor) of the geopolymer formulations tested.…”

Section: Metakaolinmentioning

confidence: 99%

Chemical characterisation of metakaolin and fly ash based geopolymers during exposure to solvents used in carbon capture

Gordon

Nicolas

Provis

2014

International Journal of Greenhouse Gas Control

Self Cite

View full text Add to dashboard Cite

“…However, due to the variability in the type and sources of the precursors, some of which come from industrial by-products and/or wastes, it is necessary to study the durability of these materials in different environments in depth. Studies regarding the durability of these materials are scarce, and most of the relevant studies have been performed on pastes and mortars, many at variable concentrations and for relatively short exposure periods [ 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Resistance to Chemical Attack of Hybrid Fly Ash-Based Alkali-Activated Concretes

Valencia-Saavedra

Gutiérrez

2020

Molecules

View full text Add to dashboard Cite

The environmental impacts related to Portland cement production in terms of energy consumption, the massive use of natural resources and CO2 emissions have led to the search for alternative cementitious materials. Among these materials, alkali-activated cements based on fly ash (FA) have been considered for concrete production with greater sustainability. In the present article, the chemical durability properties (resistance to sulphates, chloride permeability, and resistance to carbonation) of a hybrid alkali-activated concrete based on fly ash–ordinary Portland cement (FA/OPC) with proportions of 80%/20% were evaluated. It is noted that the FA was a low-quality pozzolan with a high unburned carbon content (20.67%). The results indicated that FA/OPC concrete had good durability with respect to the OPC concrete, with 95% less expansion in the presence of sodium sulphate and a 2% strength loss at 1100 days, compared with the 56% strength loss of the OPC concrete. In addition, FA/OPC showed lower chloride permeability. On the contrary, the FA/OPC was more susceptible to carbonation. However, the residual compressive strength was 23 MPa at 360 days of CO2 exposure. Based on the results, FA/OPC, using this type of FA, can be used as a replacement for OPC in the presence of these aggressive agents in the service environment.

show abstract

Durability and Testing – Chemical Matrix Degradation Processes

Cited by 17 publications

References 60 publications

Effect of slag content and activator dosage on the resistance of fly ash geopolymer binders to sulfuric acid attack

Effect of slag content and activator dosage on the resistance of fly ash geopolymer binders to sulfuric acid attack

Chemical characterisation of metakaolin and fly ash based geopolymers during exposure to solvents used in carbon capture

Resistance to Chemical Attack of Hybrid Fly Ash-Based Alkali-Activated Concretes

Contact Info

Product

Resources

About