Physical Properties and Durability of Lime-Cement Mortars Prepared with Water Containing Micro-Nano Bubbles of Various Gases

Abstract

The paper presents the experimental studies on the effect of the water containing micro-nano bubbles of various gases on the physico-mechanical properties of lime-cement mortars. In total, 7 types of mortars were prepared: with water containing the micro-nano bubbles of O2, O3 or CO2 as 50% or 100% substitute of ordinary mixing water (tap water) and the reference mortar prepared using tap water. In order to determine the influence of water with micro-nano bubbles of gases, the consistency of fresh mortar and the physical properties of hardened mortar, i.e., specific and apparent density, total porosity, water absorption by weight and capillary absorption, were established. The mechanical strength of the considered mortars was studied as well by conducting the tests for flexural and compressive strengths following 14, 28 and 56 days. Reduced workability and capillary absorption were observed in the modified mortars within the range of 0.9–8.5%. The mortars indicated an increase in the flexural strength after 28 days ranging from 3.4% to 23.5% and improved compressive strength in 1.2–31%, in comparison to the reference mortar. The conducted studies indicated increased flexural and compressive strengths along with the share of micro-nano bubbles of gases in the mixing water.

Influence of Water with Oxygen and Ozone Micro-Nano Bubbles on Concrete Physical Properties

“…A previous study by the authors [36] showed a 1.9% increase in water absorption by weight for lime-cement mortars containing water with micro-nano ozone bubbles compared to a reference mortar. Micro-nano gas bubble water also improves cement composites in terms of mechanical properties.…”

“…The described configuration allowed for obtaining typical nanobubble diameters from 80 to >200 nm [36]. The size and quantity of micro-nano bubbles were controlled by such physical parameters as liquid and gas flow rates, as well as pressure.…”

“…Yahyaei et al [30] observed an increase of about 3% in tensile strength after 28 days, in comparison to the reference samples. Authors [36] observed an increase in flexural and compressive strengths following 14, 28 and 56 days of curing in lime-cement mortars containing micro-nano bubbles with oxygen, ozone and carbon dioxide.…”

“…Micro-nano gas bubble water also improves cement composites in terms of mechanical properties. Taherpour Komishani et al [37] observed correlations of compressive strength increasing along with the replacement ratio of ordinary water to water with micro-nano air bubbles [31][32][33][34]36,38]. Arefi et al [31] noticed that the concretes prepared by applying water with micro-nano air bubbles had approximately 19% higher compressive strength, in comparison to the reference concretes.…”

The Possibility of Using Sewage Sludge Pellets as Thermal Insulation

“…Its advantage is that it does not require only quantitative type data. In the past, the method has been used in work on contaminants in the water environment [35,36], the effect of water on the physical properties of concrete [37], but also haptic analysis of physical measurements of roughness and compressibility of materials [38].…”