The effect of natural pozzolans on properties of vibropressed interlocking concrete blocks in different curing conditions

Hunyak, Oleksii; Sobol, Khrystyna; Markiv, Taras; Bidos, Volodymyr

doi:10.30657/pea.2019.22.01

Cited by 9 publications

(3 citation statements)

References 10 publications

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“…As it has been shown, the addition of volcanic tuff can increase the compressive and flexural strength of mortar [5,6] as well as improve the resistance of concrete to sulphates and alkali-silica reactions [7]. Zeolite-rich tuffs, which contain a large amount of reactive SiO 2 and Al 2 O 3 , are able to increase the flexural and compressive strength of concrete blocks in the late hardening phase [8]. According to the paper of Ababneh and Matalhah [9], the quantities of volcanic tuffs available in Jordan are high and estimated at 800 million tons.…”

Section: Introductionmentioning

confidence: 98%

The Characterization of Ukrainian Volcanic Tuffs from the Khmelnytsky Region with the Theoretical Analysis of Their Application in Construction and Environmental Technologies

et al. 2021

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(1) The mineral deposits are the base resources of materials used in building and environmental engineering applications, especially available locally. Two wells of volcanic tuff deposits in the Khmelnytsky region of Ukraine were investigated in this regard. (2) Physical-mechanical, chemical, and mineralogical analyses of the core samples were carried out. (3) The tuff samples were characterized by visible colour, low compressive strength (4.34–11.13 MPa), and high water absorption (30%). The dominant minerals of the upper horizon were chlorite, pyroxene, kaolinite, quartz, hematite, and calcite, while those of the lower horizon included analcime, quartz, hematite, and calcite. (4) The studied volcanic tuffs seem to be only partly useful for construction applications, and considering their visible colour, the exterior decoration of engineering objects could be possible. The peculiarity of the minerals of the upper horizon is that their crystals consist of Fe2+. An analysis of existing scientific data made it possible to say that these minerals can be considered as an alternative to expensive metallic iron in reducing the toxicity of chromium, uranium, and halogenated organic compounds. The significant presence of hematite allows the application of tuffs to technologies of water purification from As5+, As3+, Cr6+, Cr3+, U6+, Sb5+, and Se4+ oxyanions.

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Section: Introductionmentioning

confidence: 98%

The Characterization of Ukrainian Volcanic Tuffs from the Khmelnytsky Region with the Theoretical Analysis of Their Application in Construction and Environmental Technologies

et al. 2021

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“…It has been proved that volcanic ash rock can improve durability. For instance, the effect of adding natural volcanic ash minerals on durability (Hunyak et al, 2019a)and the effect of blast furnace slag on durability (Markiv et al, 2016). It has also been proved that volcanic ash rock can reduce hydration heat (Najimi et al, 2008) after being added, but these data do not include dacite.…”

Section: Introductionmentioning

confidence: 99%

Study on microstructural and mechanical properties of cementitious materials composed of fly ash and dacite powder

Liu,

Tan,

Qiu

et al. 2024

Front. Mater.

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The hydration reaction of mass concrete seriously endangers the structural safety. At present, the concrete production relies excessively on fly ash due to hydration reaction. In view of the problem that the demand of fly ash exceeds the supply, this paper proposes to use dacite powder to partially replace fly ash as the raw material for preparing cementitious materials. Through comprehensive tests and microstructure tests, various properties of dacite powder and fly ash composite cementitious materials are studied. The results show that: 1. The dacite powder with a specific surface area of 650 m2/kg, a fineness of 15% under laser particle size and a ball-milling time of 1.0 h has the best performance. 2. It is advisable to mix dacite powder and fly ash. The total amount of dacite powder should not exceed 30% of the cementitious material. It has the best performance when the amount of dacite powder and fly ash is the same. 3. The alkali activity of aggregate can hardly be inhibited by mixing dacite powder alone. The recommended measures to inhibit the alkali activity of aggregate are: i) mixing more than 20% fly ash alone. ii) mixed with 25% dacite powder and more than 15% fly ash.

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“…The effect of pozzolan additions to mortars and concretes varies depending on the type of pozzolan and the percentage of cement or aggregate substituted, among other factors. Generally speaking, pozzolan additions have been reported to increase durability [ 5 , 13 , 14 , 15 , 21 , 26 , 32 , 33 , 34 , 35 , 36 , 37 , 38 ], decrease the heat of hydration [ 1 , 38 ], increase resistance to sulfate attack [ 1 , 39 ], increase setting time, prevent water penetration [ 1 , 40 ], and reduce energy cost per unit of cement [ 37 ]. Specifically, the effect these additions have on mechanical strength depends on many factors, and conflicting results can often be found in the literature.…”

Section: Introductionmentioning

confidence: 99%

Durability of Reinforced Concrete with Additions of Natural Pozzolans of Volcanic Origin

et al. 2022

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In this work, the properties of concrete modified with dosages of natural pozzolans (NP) in substitution of cement or superfine aggregates were evaluated. Proportions of 20/80 pozzolan/cement or pozzolan/superfine aggregates were selected for the additions of quarry and tuff pozzolans. Pozzolanic activity, durability, compressive strength, characteristic resistance, settling consistency, density, electrical resistivity, depth of water penetration, accessible porosity, and carbonation and chloride penetration were determined for the resulting concrete mixtures, and they were subsequently compared to the values obtained for the reference concrete batches without additions. The results of the cementitious mixtures supplemented with tuff (PZT) and quarry (PZQ) pozzolans, expressed in mmol/L, are consistent with the pozzolanism test, with [Ca(OH)2]/[OH−] ratios at 7 days are 6.03/60.19 for PZQ and 1.78/92.78 PZT. In addition to the pozzolanic activity at these dosages, the characteristic resistance and durability parameters required by EHE-08 were verified. Particular attention was given to the determination of the diffusion of chloride ions, introducing an instrumental modification of the accelerated integral method. The modification provides values of diffusion coefficients similar to those obtained by the other methods with the advantage of greater stability and quality of the measurement.

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The effect of natural pozzolans on properties of vibropressed interlocking concrete blocks in different curing conditions

Cited by 9 publications

References 10 publications

The Characterization of Ukrainian Volcanic Tuffs from the Khmelnytsky Region with the Theoretical Analysis of Their Application in Construction and Environmental Technologies

The Characterization of Ukrainian Volcanic Tuffs from the Khmelnytsky Region with the Theoretical Analysis of Their Application in Construction and Environmental Technologies

Study on microstructural and mechanical properties of cementitious materials composed of fly ash and dacite powder

Durability of Reinforced Concrete with Additions of Natural Pozzolans of Volcanic Origin

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