Jordi Payá

TL;DR: In this article, the physical properties of Colombian Portland cement type III replaced with nanosilica in percentages of 1, 3, 5 and 10% were evaluated, and the main determined properties were fluidity, normal consistency, setting times, heat of hydration and compressive strength on pastes and mortars.

TL;DR: In this paper, the influence of original and ground sewage sludge ash on mortars workability and compressive strength has been studied, and it was found that a decrease of workability is observed when 30 % of Portland cement is replaced by original ash.

TL;DR: In this article, a potentiometric sensor using thick-film technology was developed to monitor and control the carbonation process of concrete reinforcements, and the results of the research carried out to characterise the pH sensor, including the materials, response time, sensitivity, detection limit, reproducibility, reversibility and the study of chloride interference.

TL;DR: In this paper, three different cellular concrete systems were investigated: (i) traditional cellular concrete based on ordinary Portland cement and commercial aluminium powder; (ii) geopolymer cellular concrete applying alkali-activated chemical technology with a comparison of the use of two precursors, fluid catalytic cracking catalyst residue (FCC) and blast furnace slag (BFS), and recycled aluminium foil as an aerating agent, where commercial waterglass was replaced by an agro-industrial byproduct, rice husk ash (RHA), in the activating solution.

TL;DR: In this article, the Pourbaix diagram of the redox-active 2 has been calculated from those data and the same conditions at which the potentiometry was carried out and the pKa values for the mixed-valence FeIIFeIII and oxidised FeIIIFeIII species determined by fitting the curve of E½versus pH.