Microsilica as an Addition

Lewis, Robert C.; Fidjestöl, P

doi:10.1016/b978-0-08-100773-0.00011-3

Cited by 8 publications

(5 citation statements)

References 18 publications

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“…By filling in the gaps between cement particles, it reduces permeability (Rasheeduzzafar et al 1991), limiting the leaching of chemicals (e.g. hydroxyl radicals; Eglinton 1987) and increasing the strength and longevity of the hardened concrete (Lewis & Fidjestøl 2019). Additionally, leached hydroxides are quickly dissipated in high flow environments (Law & Evans 2013), suggesting that, even when employed at a large scale, any change in pH due to cement outplanting would be miniscule and short‐lived.…”

Section: Discussionmentioning

confidence: 99%

Outplanting optimized: developing a more efficient coral attachment technique using Portland cement

Unsworth

Hesley

D’Alessandro

et al. 2020

Restoration Ecology

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Coral reefs are among the most valuable and vulnerable ecosystems on Earth. Their decline has spurred global interest in efforts to augment native coral populations through coral gardening. As these efforts expand, practitioners are constantly looking for new techniques to reduce costs and increase their restoration footprint. However, commonly employed coral attachment methods limit the numbers of corals that can be outplanted per day, representing a substantial bottleneck in the coral restoration process. Cement has potential as a more cost‐ and time‐efficient coral attachment technique, but research is needed to understand its effects on coral survivorship and develop best practices for its use. Here, we use lab and field tests in a three‐stage elimination format to determine the most effective cement mixture for outplanting Acropora cervicornis. We then compare this new method to two commonly used coral attachment techniques: the nail and cable tie method and two‐part epoxy putty. Our tests identified the optimal cement mix to be a combination of 10 parts type I/II Portland cement to one part silica fume. This mix yielded equivalent survivorship to the other two methods, is quick and easy to use making it ideal for citizen scientists, and has roughly one‐tenth of the material cost of other methods. These results support the wider use of cement for coral outplanting in order to minimize costs, maximize efficiency, and increase the effectiveness of coral restoration efforts around the world.

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Section: Discussionmentioning

confidence: 99%

Outplanting optimized: developing a more efficient coral attachment technique using Portland cement

Unsworth

Hesley

D’Alessandro

et al. 2020

Restoration Ecology

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“…However, no further progress was made in this direction. These studies were conducted amid stringent environmental standards for the metallurgical industry, predominantly concerning industrial gas purification, which incurs substantial costs, especially for multi-stage filtration systems [53,54]. Braulio, M.A.L.…”

Section: Study Of Promising Methods For Processing and Recycling Wast...mentioning

confidence: 99%

“…It is a well-established fact that there exists an inverse relationship between porosity and the strength of cement stone. In theory, the maximum strength of cement stone can be achieved when capillary porosity approaches zero [51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68].…”

Section: Preparation Of Nanosilicamentioning

confidence: 99%

Analysis of Experience in the Use of Micro- and Nanoadditives from Silicon Production Waste in Concrete Technologies

Karlina,

Gladkikh

2023

Minerals

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The integration of nanotechnology across various industries has significantly enhanced product quality and manufacturing technologies for diverse materials. Within the construction sector, the adoption of nanomaterials has sparked the advent of innovative construction methods. Extensive studies have been conducted on various nanomaterials, particularly micro- and nanosilica, exploring their use as partial substitutes for cement in concrete formulations. This study aimed to furnish a comprehensive overview of silica’s impact on concrete properties in civil engineering and road construction. Environmental concerns and potential hazards necessitate the development of strategies for managing industrial by-products. Metallurgical processes generate several such by-products, among which is silica fume—a residue from smelting in the silicon and ferrosilicon industries. Waste silica dust and slurries have proven highly effective in creating high-strength, high-performance concrete. The study presents a literature review focusing on micro- and nanosilica derived from production waste at ferroalloy and silicon plants. It includes a comparative analysis of the primary characteristics of microsilica from various sources and examines the extensive use of microsilica as a modifying additive in building materials. Analyzing different concrete compositions with and without fumed silica determined the ranges of results for each indicator. The incorporation of micro- and nanosilica into the concrete mix demonstrated its efficacy. The morphology of waste silica particles, characterized by the smooth and spherical surfaces of micro- and nanosilica particles, significantly influences the workability properties of the concrete.

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“…Figure 2 shows an increase in the mechanical properties in the 1:1 mixes as compared with the plain lime mortar (control group) [45]. This fact can be ascribed to the presence of mine tailings that, due to their high content of silicates, can enhance pozzolanic reactions and consequently increase the C-S-H phases of the mortar [36,46]. As a consequence, the compressive strength of these specimens increased.…”

Section: Effect Of Mining Tailings Encapsulation On the Properties An...mentioning

confidence: 97%

Increasing the Sustainability of the Stabilization/Solidification of Potentially Toxic Elements Contained in Tailings from an Active Mine Using a Modified Lime Mortar

González-Sánchez,

Fernández-Villagómez,

Loredo Jasso

et al. 2024

Sustainability

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The use of a modified lime mortar as a binder for the stabilization/solidification of mine tailings presents a promising and sustainable solution for immobilizing potentially toxic elements found in these waste materials compared to cement mortars. The effectiveness of this modified lime mortar in avoiding the mobility of toxic elements, namely lead (Pb) and arsenic (As), in mine tailings has been thus studied. Encapsulating matrices of 1:1 and 2:1 tailings waste/air lime ratios were prepared. Due to the content of potentially pozzolanic compounds in the mine tailings, mainly some silicate phases, 1:1 matrices showed better mechanical strength than 2:1 samples, ascribed to a more intense pozzolanic reaction. SEM observations identified needle-shaped C-S-H structures. The hardened materials showed good endurance against freeze–thaw cycles. The semi-dynamic tank test demonstrated the effective encapsulation of the toxic components due to the use of lime mortars, yielding values of released Pb and As below the detection limit in all instances. Considering the cost-effectiveness, widespread availability, and ease of use, the use of modified lime mortar for the treatment of mine tailings can be recommended to mitigate the environmental impacts of mining activities.

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Microsilica as an Addition

Cited by 8 publications

References 18 publications

Outplanting optimized: developing a more efficient coral attachment technique using Portland cement

Outplanting optimized: developing a more efficient coral attachment technique using Portland cement

Analysis of Experience in the Use of Micro- and Nanoadditives from Silicon Production Waste in Concrete Technologies

Increasing the Sustainability of the Stabilization/Solidification of Potentially Toxic Elements Contained in Tailings from an Active Mine Using a Modified Lime Mortar

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