The effect of zinc, water to binder ratio and silica fume on the hydration and mechanical properties of Portland cement mixtures

Abstract

The amount of zinc in the clinker or in the secondary raw materials has been increasing in recent years mainly due to the processing of waste materials containing zinc. The aim of this work is to show the effect of zinc on hydration of Portland cement and mechanical properties. These effects were studied by isoperibol calorimetry and mechanical properties testing. Zinc was added to the cement in the form poorly soluble compound ZnO. The concentration of zinc added was chosen as 1wt. percent. The newly formed compounds during hydration were identified by X-ray diffraction method (XRD). Another objective is to show the effect of silica fume (microsilica, SF) as the secondary raw material and water to binder ratio on hydration of cement in the presence of zinc.

Investigating the release of ZnO nanoparticles from cement mortars on microbiological models

“…However, at later testing ages, specimens exhibit satisfactory mechanical performance (Shafeek et al 2020). The calorimetric study held by Siler et al (2019) showed that in OPC system, induction period length increased from 3.3 to 97.4 h when 1 wt.-% of ZnO nanoparticles was incorporated into the cementitious system.…”

“…Depending on the type of NP used, various beneficial modifications of cementitious composites can be achieved. For instance, ZnO nanoparticles are used for altering a vast range of composites' properties, including retardation of hydration and setting time of cement (Senff et al 2014;Liu et al 2019;Siler et al 2019;Osman et al 2020), modification of rheological parameters (Ghafari et al 2016), improving long-term mechanical performance (Nazari and Riahi 2011;Thangapandi et al 2020), increasing impermeability of the cement matrix (Nazari and Riahi 2011;Arefi and Rezaei-Zarchi 2012;Kamal et al 2020) as well as producing composites with self-cleaning and antibacterial (Senff et al 2014;Elia and Nima 2019;Le Pivert et al 2019) or electroconductive ability (Ghahari et al 2017).…”

Mechanical and Durability Characteristics of TiO2 and Al2O3 Nanoparticles with Sisal Fibers

“…Concrete as a building material has its demand in the infrastructure sector for a long time. Owing to its attributes such as its versatility, mechanical properties, and availability, concrete has been used at about 20 billion tones as per the per capita consumption globally [17]. Moreover, due to the dynamic nature of the concrete, it is possible for various interventions that can be done to increase the efficiency and performance of the building material.…”