![]() This paper also addresses recent developments, and future scope that may aid in employing antimicrobial material in the construction sector, particularly to benefit plumbing and sanitation used in hospitals and high traffic areas and public places including airports, schools, and other educational establishments. Therefore, this review paper summarises various types of antimicrobial materials currently used in the construction sector detailing their mode of biocidal activity, and their application in structures. The literature covering these topics vital to the construction sector is rather scarce. An ideal antimicrobial material should possess qualities such as sustainability, durability, eco-friendliness, economic viability to avoid the growing issue of antimicrobial resistance (AMR). ![]() Antimicrobial materials provide a biocidal approach for eradicating the microbes either by inhibiting their growth, or by actively killing them. One key example is that of microbiologically induced concrete corrosion (MICC) due to the bacteria in concrete sewerage pipes which leads to reduced lifespan of sewer pipes. The further ageing causes additional growth of strengths with a significantly higher increase in the case of CMCH.ĭamage caused by microbes results in compromised structural integrity. With the increasing amount of time, the difference in strengths between reference and tested mortars decreases, reaching the similar values after 90 days of curing time. The addition of HPCH significantly reduces the bulk densities of specimens, while CMCH decreases them just slightly. The addition of admixtures improves workability of mortar, but in the early stages also decreases strengths of mortars, especially the compressive strength. The properties were studied on the specimens up to 365 days. The physical-mechanical properties were studied on the specimens prepared with constant water/binder ratio and binder/aggregate ratio 1:3 by weight using siliceous sand with the grain size up to 4 mm and doses of admixture ranging between 0.5 and 10‰. This paper studies the possibility of usage of chitosan derivatives (hydroxypropyl chitosan (HPCH) and carboxymethyl chitosan (CMCH)) as admixtures for aerial lime-based mortars. This study showed that the use of some of the studied admixtures may improve the adhesion of mortar to the brick substrate. The air-entraining function of some admixtures improves the frost resistance of the mortars however, it would negatively affect the adhesive strength by incorporating pores into the contact zone between the mortar and brick substrate. When subjected to temperature-varying cycles, the mortars are more prone to in-mortar failure during the pull-off test. On the contrary, water retention and increased water content are beneficial on a dry surface, while paste viscosity plays only a minor role. The viscosity-modifying function improves the adhesive strength between mortar and pre-wetter brick by increasing the binder paste viscosity, while the water-retentive function along with increased water content may lead to a decrease in adhesive strength. The use of admixtures increases the water/binder ratio, which in turn leads to a decrease in the strength of the mortars. This article studies the influence of biopolymeric viscosity-modifying admixtures with water-retentive function on the physico-mechanical properties of natural hydraulic lime-based mortars and their adherence to the traditional fired-clay brick substrate.
0 Comments
Leave a Reply. |