Use of Milled Seashell as Fine Aggregate in Self-Compacting Mortars.

This study focuses on the feasibility of using ground seashells as fine aggregates for self-compacting mortar production. The obtained results show a promising future for coastal industries as their use eliminates waste products and improves the durability of these materials. The use of recycled aggregate, in terms of durability, improves the performance of all mixes made with seashells compared to those made with natural sand, although it decreases workability and slightly reduces mechanical strength.

Accelerated Carbonation of Vibro-Compacted Porous Concrete for Eco-Friendly Precast Elements.

This research studied the effect of accelerated carbonation in the physical, mechanical and chemical properties of a non-structural vibro-compacted porous concrete made with natural aggregates and two types of recycled aggregates from construction and demolition waste (CDW). Natural aggregates were replaced by recycled aggregates using a volumetric substitution method and the CO capture capacity was also calculated. Two hardening environments were used: a carbonation chamber with 5% CO and a normal climatic chamber with atmospheric CO concentration.

Carbon Emission Evaluation of CO Curing in Vibro-Compacted Precast Concrete Made with Recycled Aggregates.

The objective of the present study was to explore three types of vibro-compacted precast concrete mixtures replacing fine and coarse gravel with a recycled/mixed concrete aggregate (RCA or MCA). The portlandite phase found in RCA and MCA by XRD is a "potential" CO sink. CO curing improved the compressive strength in all the mixtures studied.

Optimising the Performance of CO-Cured Alkali-Activated Aluminosilicate Industrial By-Products as Precursors.

Three industrial aluminosilicate wastes were studied as precursors to produce alkali-activated concrete: (i) electric arc furnace slag, (ii) municipal solid waste incineration bottom ashes, and (iii) waste glass rejects. These were characterized via X-ray diffraction and fluorescence, laser particle size distribution, thermogravimetric, and Fourier-transform infrared analyses. Distinctive combinations of anhydrous sodium hydroxide and sodium silicate solution were tried by varying the NaO/binder ratio (8%, 10%, 12%, 14%) and SiO/NaO ratio (0, 0.

The Effect of Shell Powder as Filler on the Performance of Self-Compacting Mortar.

In this research, the feasibility of using shell waste from the canning industry in the manufacturing of self-compacting mortar (SCM) was tested. The seashells were finely ground to be used as filler instead of the limestone filler normally used in this type of SCM. First, a physicochemical and microstructural characterisation of all raw materials was carried out, including the particle size distribution of both fillers.

Use of Carbonated Water as Kneading in Mortars Made with Recycled Aggregates.

The increased concern about climate change is revolutionising the building materials sector, making sustainability and environmental friendliness increasingly important. This study evaluates the feasibility of incorporating recycled masonry aggregate (construction and demolition waste) in porous cement-based materials using carbonated water in mixing followed (or not) by curing in a CO atmosphere. The use of carbonated water can be very revolutionary in cement-based materials, as it allows hydration and carbonation to occur simultaneously.

The Performance of Concrete Made with Secondary Products-Recycled Coarse Aggregates, Recycled Cement Mortar, and Fly Ash-Slag Mix.

The properties of cement concrete using waste materials-namely, recycled cement mortar, fly ash-slag, and recycled concrete aggregate-are presented. A treatment process for waste materials is proposed. Two research experiments were conducted.