Author
L. Reig
Bio: L. Reig is an academic researcher from James I University. The author has contributed to research in topics: Compressive strength & Portland cement. The author has an hindex of 15, co-authored 29 publications receiving 713 citations.
Papers
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TL;DR: In this paper, the properties and microstructure of alkali-activated cement pastes and mortars produced using red clay brick waste were investigated, and it was shown that the type and concentration of acid activator can be optimised to produce mortar samples with compressive strengths up to 50MPa after curing for 7 days at 65°C.
241 citations
TL;DR: In this paper, the properties and microstructure of alkali-activated cement pastes and mortars produced from ceramic waste materials of various origins were investigated, and the compressive strength of the developed mortars ranged between 22 and 41MPa after 7 days of curing at 65°C, depending on the sodium concentration and the water/binder ratio.
Abstract: Ceramic materials represent around 45 % of construction and demolition waste, and originate not only from the building process, but also as rejected bricks and tiles from industry. Despite the fact that these wastes are mostly used as road sub-base or construction backfill materials, they can also be employed as supplementary cementitious materials, or even as raw material for alkali-activated binders. This research aimed to investigate the properties and microstructure of alkali-activated cement pastes and mortars produced from ceramic waste materials of various origins. Sodium hydroxide and sodium silicate were used to prepare the activating solution. The compressive strength of the developed mortars ranged between 22 and 41 MPa after 7 days of curing at 65 °C, depending on the sodium concentration in the solution and the water/binder ratio. These results demonstrate the possibility of using alkali-activated ceramic materials in building applications. Ceramic materials represent around 45 % of construction and demolition waste in Spain. In the present study, two different ceramic materials, red ceramic bricks and porcelain stoneware were alkali-activated in order to produce pastes and mortars. The figure shows the microstructure of pastes obtained using a sodium silicate solution and NaOH pellets as activators. Both materials presented differences related to the process and the optimum concentration of activator. Mortars with compressive strengths ranging from 22 to 41 MPa were obtained after 7 days of curing at 65 °C, which make them suitable for building applications.
114 citations
TL;DR: In this paper, the effect of fly ash and the hemihydrate form of calcium sulfate on the properties of CSAC was studied and the results suggest that the use of Fly Ash in the presence of anhydrite accelerates the formation of a strong ettringite-rich matrix that firmly accommodated unreacted fly ash particles, both synergistically contributing to a dense microstructure.
111 citations
TL;DR: In this article, the Spanish Ministry of Science and Innovation (MOSI) and FEDER funded Project GEOCEDEM BIA 2011-26947 were used to support this study.
Abstract: The authors are grateful to the Spanish Ministry of Science and Innovation for supporting this study through Project GEOCEDEM BIA 2011-26947, and to FEDER funding.
65 citations
TL;DR: In this paper, the authors investigated alkali-activated mortars with high ceramic waste contents and found that the mechanical properties of these mortars varied with the type of aggregate used to obtain a binding matrix.
52 citations
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TL;DR: Alkali activation is a highly active and rapidly developing field of activity in the global research and development community as discussed by the authors, and commercial-scale deployment of alkali-activated cements and concretes is now proceeding rapidly in multiple nations.
873 citations
TL;DR: In this article, the authors summarized the existing knowledge regarding the carbonation of cement-based materials and identified the areas which require further investigations, including the potential of CO 2 storage in concrete and the newly developed carbonate binders.
311 citations
TL;DR: In this article, seven cementitious binders comprised of metakaolin, silica fume and nano-silica have improved thermal performance compared with Portland cement and calculated the full CO2 emissions associated with manufacture and transport of each binder for the first time.
256 citations
TL;DR: In this paper, the properties and microstructure of alkali-activated cement pastes and mortars produced using red clay brick waste were investigated, and it was shown that the type and concentration of acid activator can be optimised to produce mortar samples with compressive strengths up to 50MPa after curing for 7 days at 65°C.
241 citations
TL;DR: In this article, the authors focus solely on advances in metals, highlighting the current and emerging technologies in metals processing, metal surface treatment, and integration of metals into hybrid materials systems.
217 citations