Alkali-activated cements and mortars based on blast furnace slag and red clay brick waste

Rakhimova, Nailia R.; Рахимов, Р З

doi:10.1016/j.matdes.2015.06.182

Cited by 122 publications

(62 citation statements)

References 36 publications

(40 reference statements)

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“…As a result, a solid and compact structure forming a dominant component of the matrix of the composite, or coating system, is created. 1,2 This paper deals with the development of a coating system based on alkali-activated substances to be used for the protection of reinforced concrete structures exposed to extreme conditions. A typical example representing such extreme conditions includes the joint effect of chemically aggressive environments and increased temperature.…”

Section: Specification Of the Coatings Being Developedmentioning

confidence: 99%

“…The coating composition obtained by the optimisation process is shown in Table 1. The optimisation process for AAM-based coating development follows the research presented in [1][2][3][4] . For instance, the effect of the water glass silicate module is examined in this case in relation to the slag chemical composition, further to the glass-phase content in it, etc.…”

Section: Experimental Partmentioning

confidence: 99%

“…For the water glass used, a silicate modulus of 1.7 was applied. Primarily, the water glass silicate module drew from the findings presented in 1,4,5 . The chemical composition of the water glass is shown in Table 2.…”

Section: Experimental Partmentioning

confidence: 99%

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The development of new types of secondary protection for concrete structures exposed to extreme conditions

Dufka¹,

Melichar²,

Bydžovský³

et al. 2017

Mater. Tehnol.

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During their use reinforced concrete structures are exposed to external influences. Nowadays, the reducing effect of these influences is usually ensured by secondary (barrier) protection. At present, coatings based on organic substances are commonly used. However, these types of secondary protection show substantial limits under extreme conditions. A method that has considerable potential to eliminate these disadvantages includes the application of secondary protection based on alkali-activated materials or geopolymers. This paper is focused on the development and optimisation of secondary protection (coating, plaster) based on alkali-activated materials intended for reinforced concrete structures to be exposed to highly chemically aggressive environments. Keywords: coatings, alkali-activated substances, extreme conditions, agressive environment, durability of structures Med uporabo so armirane betonske konstrukcije izpostavljene zunanjim vplivom. Danes se zmanj{anje vpliva teh u~inkov zagotovi z uporabo sekundarne za{~ite (prepreka). Obi~ajno se uporabljajo premazi na osnovi organskih snovi. Vendar pa so te vrste sekundarne za{~ite precej omejene pri ekstremnih pogojih. Metoda s potencialom da odpravi te pomanjkljivosti, vklju~uje uporabo sekundarne za{~ite na osnovi alkalno-aktiviranih materialov ali geopolimerov.^lanek obravnava razvoj in optimiranje sekundarne za{~ite (premaz, omet) na osnovi alkalno aktiviranega materiala, namenjenega za armirane betonske konstrukcije, ki bodo izpostavljene kemijsko mo~no agresivnemu okolju. Klju~ne besede: premazi, alkalno-aktivirane snovi, ekstremni pogoji, agresivno okolje, zdr`ljivost konstrukcij

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Section: Specification Of the Coatings Being Developedmentioning

confidence: 99%

Section: Experimental Partmentioning

confidence: 99%

See 1 more Smart Citation

The development of new types of secondary protection for concrete structures exposed to extreme conditions

Dufka¹,

Melichar²,

Bydžovský³

et al. 2017

Mater. Tehnol.

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“…Several studies and research were made to develop either alkali-activated materials or hybrid cement using BP as a source of alumina silicate materials and other minerals. Early studies focused on producing alkali-activated materials based on itself or on the combination of BP with and other minerals; namely, different ceramic waste types [12], [13], BP with concrete waste [14] and BP with GGBFS [15], brick waste powder with fly ash [16], red clay brick waste only [17], [18] and ordinary Portland cement with BP [18].…”

Section: Introductionmentioning

confidence: 99%

Study of an alkali-activated binder based on tungsten mining mud and brick powder waste

Sedira¹,

Castro-Gomes²

2018

MATEC Web Conf.

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Abstract. Blends of Tungsten mining waste mud (TMWM) and brick waste powder (BP) with different dosages were used as precursors for the study of a new binder obtained by alkali-activation. The synthesis was obtained at 60ºC curing during the first 24 hours and at 20°C during the remaining period. A combination of sodium hydroxide (SH) and sodium silicate (SS) solutions was used with SS/SH weight ratio equal 1.5. The solid precursors/liquid activators weight ratio equal to 4. And the modules SiO 2 /Na 2 O increase with the increasing of BP dosages 5.21 and 5.59 for dosages 10% and 50%, respectively. Mineralogical characterisation of raw materials was carried out by X-ray diffraction (XRD). The effect of the dosage of BP on the compressive strength and pore size distribution of the new binder was investigated from 24 hours up to 28 days. The pore size distribution was obtained mercury intrusion porosimetry (MIP). The increase in the dosages of BP, between 10 to 50%, was followed by an increase in compressive strength, from 25 to 59 MPa, for all the tested ages. The binder matrix become more dense and compact with the gradually increase of BP dosages, as found out by MIP.

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“…A number of recent studies have already provided a detailed overview on ferrous and nonferrous slags, their chemical and phase composition and potential applications (e.g., Ettler et al 2015;Hocking 2005;Piatak et al 2015;Potysz et al 2015a;Schlesinger et al 2011;Schmukat et al 2012Schmukat et al , 2015. In general, modern slags resulting from Fe and steel production are being most commonly studied compared to historical slags in order to test the properties of slag considering them to be reused (Piatak et al 2015;Rakhimova and Rakhimov 2015;Ulubeyli and Artir 2015;Yi et al 2012). Unlike ferrous slags, non-ferrous slags generally contain elevated levels of potentially toxic elements and more studies have been conducted on their environmental impact (Ettler et al 2015;Kierczak et al 2009Kierczak et al , 2013Parsons et al 2001;Schindler 2014) or their evaluation in order to avoid leaching of metal(loid)s prior rendering them suitable for use as construction materials (Pacheco-Torgal et al 2015;Schmukat et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Environmental impact and potential utilization of historical Cu-Fe-Co slags

Veselská

Majzlan

2015

Environ Sci Pollut Res

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Historical slags from the past Fe and Cu-Co production were investigated in order to evaluate either their potential for utilization or their long-term environmental risk for unsupervised old smelting areas. Here, we studied ferrous slags produced during the recovery of Fe from siderite-Cu ores in Slovakia and two different types of non-ferrous slags produced during the recovery of Cu and Co from Kupferschiefer ores in Germany. The glassy character, rare occurrence of primary silicate phases, and the lack of secondary phases in Cu slags indicate their stability for a prolonged period of time. Electron microprobe analytical work showed that the metals and metalloids (Cu, Co, Fe, Zn, Pb, As) are largely encased in droplets of matte and metal alloys and remain protected by the glassy matrix with its low weathering rate. Fe and Co slags are composed of high-temperature silicates such as wollastonite, cristobalite, as well as olivine, feldspar, quartz, leucite, pyroxene, and pyroxenoids. The presence of secondary phases attests to a certain degree metal release owing to weathering. Assuming minimal contents of metals in slags after a treatment with dilute H2SO4, slags could be used as pozzolanas for addition to cement.

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Alkali-activated cements and mortars based on blast furnace slag and red clay brick waste

Cited by 122 publications

References 36 publications

The development of new types of secondary protection for concrete structures exposed to extreme conditions

The development of new types of secondary protection for concrete structures exposed to extreme conditions

Study of an alkali-activated binder based on tungsten mining mud and brick powder waste

Environmental impact and potential utilization of historical Cu-Fe-Co slags

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