Nano Titania combined with micro silica reinforced limestone cement:Physico-mechanical Investigation

Abstract

T HE INFLUENCE of different ratios of fillers addition such as limestone and micro white sand, as well as nano-titania particles on the physico-mechanical properties of ordinary white Portland limestone cement (OWPC), has been studied. One mix (10.00 wt. %) of equal ratios from limestone and white sand in micro scale, partially replaced by cement clinker. Mechanical strength, phase composition, and microstructure of blended cement have been investigated. The results showed that filler reduces the setting time and total porosity, improve the strength, free lime content, combined water content and bulk density of cement pastes due to the pozzolanic effect of micro white sand that replaces clinker and enhance an excess amount of hydration products. It can be concluded that limestone fills the pores between cement particles due to the formation of carboaluminate, while micro sand increases the hydration C-S-H product. TiO 2 nanoparticles (i.e., less than 100 nm) shows a great efficiency in enhancing the mechanical strength of cement paste due to the efficient incorporation of nanoparticles as active sites for gel Tobermorite C-S-H fibers growth during hydration,

Waste Polymer and Lubricating Oil Used as Asphalt Rheological Modifiers

“…AS#0 is a durable asphalt, as it possesses the physical properties necessary to produce the desired initial product performance properties and is resistant to changes in its physical properties during long-term, in-service environmental aging. AS#70 durability is determined by the physical properties of the asphalt, which are determined directly by chemical composition, as indicated by the green circle representing hydrocarbons, provided by EDX analysis [ 36 , 37 ].…”

Sustainable development goals for industry, innovation, and infrastructure: demolition waste incorporated with nanoplastic waste enhanced the physicomechanical properties of white cement paste composites

“…It is obligatory to enhance integrated and sustainable solutions for managing construction waste to preserve material resources such as minerals and ores. Increasing the resource productivity, and improving the reuse and recycling of materials in a way that reduces the depletion of raw resources, preserves the environment and contributes to achieving development and environmental sustainability goals in Egypt (Kineber et al 2020 ; Abdelzaher et al 2018 ; Nik and Bahari 2012 ; Balboul et al 2019 ; Abdelzaher and Shehata 2022 ). The operation includes the collection, transportation, sorting and recycling of waste emitted from construction and demolition works, benefiting from building materials, recycling and reusing them at the project site to reduce transportation costs, dispose of waste, preserve natural resources, and benefit in a manner that achieves the requirements of the leadership system in energy and environmental designs.…”

Hydration and synergistic features of nanosilica-blended high alkaline white cement pastes composites

“…They may significantly improve the mechanical hydraulic properties, due to their pozzolanic interaction (Sharma et al 2021;Abdelzaher et al 2018). Among them are those finer than cement, such as fly ash, which is very effective not only because of its tremendous surface area, which makes it highly activated, but also because of its precise size, which allows it to fill in the spaces between cementing materials, resulting in an increase in bulk density and a reduction in total porosity (Wilińska and Pacewska 2014;Lin et al 2014;Tantawy et al 2012;Velázquez et al 2016;Balboul et al 2019). The implementation of pozzolanic materials in cement/concrete is economic due to the partial substitution of a large percentage of Portland cement with low-cost industrial by-products, resulting in lowering of the greenhouse gases generated during cement production and also they enhance the durability and workability of the final product.…”