Properties of sustainable cement mortars containing high volume of raw diatomite

Ahmadi, Zahra; Esmaeili, Jamshid; Kasaei, Jamil; Hajialioghli, Robab

doi:10.1016/j.susmat.2018.05.001

Cited by 22 publications

(19 citation statements)

References 13 publications

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“…The main reasons why the use of diatomites improves density are the filler effect and the pozzolanic reaction between the amorphous silica of the mineral addition, and the calcium hydroxide produced by the hydration reactions of the cement results in the paste being more homogeneous and denser. The same also was observed in another study [18], where water absorption of the specimens containing diatomite powder was lower than that of the control specimen. The maximum reduction of 28% in water absorption was observed in samples containing 30% diatomite powder.…”

Section: Capillary Water Absorptionsupporting

confidence: 86%

“…Conversely, a higher water demand also was observed as the percentage of diatomite used increased, which resulted in a decrease in strength. The same has been observed in other studies [12,14,[16][17][18]. Furthermore, another study carried out in a laboratory used block elements with diatomite as a substitute for aggregates and researched the effect of these parameters on the physical and mechanical properties of concrete blocks, producing good results [19].…”

Section: Introductionsupporting

confidence: 75%

“…Capillary water absorption in concrete is of major significance for the durability assessment of concrete structures. Water absorption of the specimens containing diatomite powder was lower than that of the control specimen [18]. During this study, the maximum reduction in water absorption was observed in samples containing 30% of diatomite powder.…”

Section: Introductionmentioning

confidence: 50%

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Properties of Precast Concrete Using Food Industry-Filtered Recycled Diatoms

et al. 2021

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The concrete industry is under increasing pressure to reduce greenhouse gas emissions. An immediate solution is to minimize the amount of Portland cement used by partially substituting other supplementary cementitious materials. This article presents the results of an experimental campaign on the influence of replacing Portland cement with both calcined and uncalcined diatomites from the filtration of beer and wine in the production of elements made of vibro-pressed pre-cast concrete, such as pipes. Additionally, a natural diatomite is used. The mechanical properties, capillary water absorption, carbonation, and chloride ingress are tested. The results obtained show the possibility of using natural and recycled diatomites on an industrial scale, which can improve even the long term properties of prepared precast concrete.

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Section: Capillary Water Absorptionsupporting

confidence: 86%

Section: Introductionsupporting

confidence: 75%

Section: Introductionmentioning

confidence: 50%

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Properties of Precast Concrete Using Food Industry-Filtered Recycled Diatoms

et al. 2021

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“…ese nanopores make diatomite have similar adsorption with activated carbon. And the shape of diatomite's frustules (empty, perforated sheaths) with their high capillary suction pressure can draw pollutants into their interiors [27].…”

Section: Purification Effect Of Permeable Concretementioning

confidence: 99%

Runoff Purification Effects of Permeable Concrete Modified by Diatomite and Zeolite Powder

Liu

2020

Advances in Materials Science and Engineering

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Diatomite and zeolite powder exhibit cellular structures that are beneficial to absorb pollutants in road surface runoff. In this work, the runoff purification effects of permeable concrete modified by diatomite and zeolite powder were studied. First, magnesium dihydroxide was used to modify diatomite; then the modified diatomite and the zeolite powder were innovatively adopted as binders to prepare permeable concrete. In addition, compressive strength, effective porosity, purification effect, and environmental scanning electron microscopy (ESEM) tests, as well as gray correlation analysis, were carried out. Finally, the optimal dosages of modified diatomite and zeolite powder in permeable concrete were suggested. The results show that diatomite (modified diatomite) and zeolite powder can improve the compressive strength, effective porosity, and runoff purification effects of permeable concrete. In addition, the 10% modified diatomite and the 3% zeolite powder exhibit the highest correlation with the properties of modified permeable concrete.

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“…On the contrary, Ahmadi et at. [ 32 ] determined that up to 40% of Portland cement can be substituted with raw diatomite without any deterioration in compressive strength after 28 days of curing. Moreover, after 91 days, the modified samples were up to 13% stronger, compared to the control mortar.…”

Section: Introductionmentioning

confidence: 99%

Implementation of Alternative Mineral Additives in Low-Emission Sustainable Cement Composites

Kapeluszna

Szudek

Wolka³

et al. 2021

Materials

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The influence of four naturally occurring mineral additives (zeolite, diatomite, trass and bentonite) on the hydration and properties of cement pastes and mortars was investigated. The materials change the phase composition, heat of hydration (determined by calorimetry) and mechanical properties of composites. After 28 days, the amount of Ca(OH)2 was reduced by up to 23% and up to 35% more C-S-H was formed, as proved by TG measurements. Differences were observed in the kinetics of heat release, especially for 25% of the addition. In the calorimetric curves, an additional exothermic effect is observed, related to the alteration in the hydration of C3A in cement. From the point of view of beneficial influence on mechanical properties of mortars, the additives could be ranked as follows: bentonite < diatomite, zeolite < trass after 2 days and bentonite < diatomite < trass < zeolite after 28 days of curing. The highest compressive strength (58.5 MPa) was observed for the sample with a 10% addition of zeolite. Zeolite, trass, bentonite and diatomite are all pozzolanic materials; however, their activity varies to an extent due to the differences in their specific surface area and the content of the amorphous phase, responsible for the pozzolanic reaction.

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Properties of sustainable cement mortars containing high volume of raw diatomite

Cited by 22 publications

References 13 publications

Properties of Precast Concrete Using Food Industry-Filtered Recycled Diatoms

Properties of Precast Concrete Using Food Industry-Filtered Recycled Diatoms

Runoff Purification Effects of Permeable Concrete Modified by Diatomite and Zeolite Powder

Implementation of Alternative Mineral Additives in Low-Emission Sustainable Cement Composites

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