Coal–biomass fly ashes for cement production of CEM II/A-V 42.5R

Tkaczewska, Ewelina; Mróz, Radosław; Łój, Grzegorz

doi:10.1016/j.conbuildmat.2011.10.022

Cited by 36 publications

(15 citation statements)

References 9 publications

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“…1). The experimental samples were prepared by using Portland cement TS EN 197-1 [24] CEM I 42.5 R concrete binder [25] in accordance with the standards. The diatomite and zeolite were procured from the Turkish regional sources of Kütahya and Balıkesir, respectively.…”

Section: Methodsmentioning

confidence: 99%

The effect of zeolite and diatomite on the corrosion of reinforcement steel in 1 M HCl solution

Gerengi¹,

Kurtay²,

Durgun³

2015

Results in Physics

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a b s t r a c tThe greatest disadvantage of reinforced concrete structures is the corrosion occurring in the reinforcement which, over time, causes a reduction in the reinforcement-concrete adherence and eventual sectional loss. The purpose of this study was to reveal the corrosion mechanism of ribbed reinforcement inside additive-free (reference), 20% zeolite-doped and 20% diatomite-doped concrete samples after exposure to 1 M HCl over 240 days. Electrochemical impedance spectroscopy (EIS) measurements were made every 10 days. Consequently, it was determined that the 20% zeolite-doped concrete samples had higher concrete and reinforcement resistance compared to the 20% diatomite-doped and the reference concrete, i.e. they exhibited less corrosion.

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Section: Methodsmentioning

confidence: 99%

The effect of zeolite and diatomite on the corrosion of reinforcement steel in 1 M HCl solution

Gerengi¹,

Kurtay²,

Durgun³

2015

Results in Physics

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“…Referring to the papers, the free CaO and free MgO react with water to form Ca(OH) 2 and Mg(OH) 2 , which results in volumetric expansion [ 3 , 6 , 7 , 9 ]. So, GGBS can be deemed as a stabilizer, the same as PC fly ash, which is normally added to stabilize converted slag [ 3 , 5 , 12 , 13 ]. GGBS normally remains in alkali environments producing strength.…”

Section: Methodsmentioning

confidence: 99%

“…To reuse these otherwise wasted materials (sludge, TDF and RDF), they are burned in paper mill plants in three boilers. The strength of these fly ashes is built up by pozzolanic reaction in mortar, and is better than the strength of PC fly ashes [ 13 ]. If these three fly ashes can be reused as legally recycled waste materials after special treatment or mixing with other materials, it constitutes a tremendous contribution to the paper mill industrial.…”

Section: Introductionmentioning

confidence: 99%

Recycling of Sustainable Co-Firing Fly Ashes as an Alkali Activator for GGBS in Blended Cements

Huang

Tsai

et al. 2015

Materials

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This study investigates the feasibility of co-firing fly ashes from different boilers, circulating fluidized beds (CFB) or stokers as a sustainable material in alkali activators for ground granulated blast-furnace slag (GGBS). The mixture ratio of GGBS and co-firing fly ashes is 1:1 by weight. The results indicate that only CF fly ash of CFB boilers can effectively stimulate the potential characteristics of GGBS and provide strength as an alkali activator. CF fly ash consists of CaO3 (48.5%), SiO2 (21.1%), Al2O3 (13.8%), SO3 (10.06%), Fe2O3 (2.25%) and others (4.29%). SA fly ash consists of Al2O3 (19.7%), SiO2 (36.3%), Fe2O3 (28.4%) and others (15.6%). SB fly ash consists of Al2O3 (15%), SiO2 (25.4%), Zn (20.6%), SO3 (10.9%), Fe2O3 (8.78%) and others (19.32%). The mixtures of SA fly ash and SB fly ash with GGBS, respectively, were damaged in the compressive strength test during seven days of curing. However, the built up strength of the CF fly ash and GGBS mixture can only be maintained for 7–14 days, and the compressive strength achieves 70% of that of a controlled group (cement in hardening cement paste). The strength of blended CF fly ash and GGBS started to decrease after 28 days, and the phenomenon of ettrigite was investigated due to the high levels of sulfur content. The CaO content in sustainable co-firing fly ashes must be higher than a certain percentage in reacting GGBS to ensure the strength of blended cements.

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“…In addition, several authors have attempted to relate some properties of SCM-concretes with parameters such as fly ash fineness [15], glass phase content [16] soluble and reactive silica content [17], water to powder ratio [18] and curing conditions [19]. Despite a wide literature concerning coal fly ash use as mineral admixture, up to now few works analyzed the application of fly ashes from cocombustion processes in concrete industry, and they are generally focused on a limited number of properties, i.e., cement setting time and compressive strength [20,21], concrete slump and mechanical strength [2].…”

Section: Introductionmentioning

confidence: 99%