Protection of concrete surface layer is crucial for preserving serviceability and durability structures during their service life. Chemical attack by sulfuric acid an aggressive exposure, commonly causing significant damage to elements such as buildings' foundations basement walls, buildings affected rain, industrial facilities, wastewater treatment facilities. Hence, this study endeavored evaluate the performance nano-modified composites treatments under severe chemical exposures....

Core test is commonly required in the area of concrete industry to evaluate strength and sometimes it becomes unique tool for safety assessment existing structures. therefore introduced most codes. An extensive literature survey on different international codes' provisions; including Egyptian, British, European ACI Codes, core analysis presented. All studied provisions seem be unreliable predicting in-situ cube from results tests. A comprehensive experimental study was undertaken examine...

Efficient repair of concrete pavements typically requires a rapid-setting material to accelerate opening the road traffic. While numerous high-early-strength cementitious materials are commercially available, many them vulnerable premature deterioration. On other hand, despite its improved long-term performance, incorporating fly ash is rarely used as due delay in setting time, strength gain, and microstructural development at early ages. Nevertheless, these performance limitations can be...

Nanoemulsions have emerged as a promising strategy for enhancing the preservation of meat products, leveraging their antimicrobial and antioxidant properties. Therefore, current study was planned to evaluate antibacterial effect ginger (GNE), thyme (TNE) lemongrass (LNE) oil nanoemulsions (NEs) against Escherichia coli Staphylococcus aureus strains borne isolates by concentrations 1.0 2.0% each. For that purpose, fresh minced samples were inoculated with microorganisms NEs kept in...

Nano-emulsions derived from essential oils have emerged as a promising approach to improving the preservation of meat products by utilizing their antimicrobial and antioxidant properties. Therefore, current study was planned evaluate impact ginger (GNE), thyme (TNE) lemongrass (LNE) oil-based nanoemulsions (NEs) on sensory, bacteriological chemical criteria minced shelf life keeping quality concentrations 1.0 2.0% for each during refrigeration. Results revealed that different investigated...

Repair and rehabilitation of deteriorating concrete elements are significant concern in many infrastructural facilities remain a challenging task. Concerted research efforts needed to develop repair materials that sustainable, durable, cost-effective. Research data show fiber-reinforced mortars/concretes have superior performance terms volume stability toughness. In addition, it has been recently reported nano-silica particles can generally improve the mechanical durability properties...

This paper presents the development of nanomodified fiber-reinforced cementitious composite (FRCC) mixtures. A total seven mixtures were prepared using general use cement and a constant dosage slag (40% replacement by mass base binder). Also, nanosilica was incorporated in six at 6% binder, whereas one mixture without as reference. Basalt fiber (BF) pellets (made basalt fibers encapsulated polyamide resin) used to produce BFRCC. Three had BF with different lengths (25 mm, 36 or both), two...

Efficient utilization of problematic soils such as soft clay by imparting additional strength using various stabilization techniques is done to improve soil properties. The application nanomaterials in the area has great potential create a stiff skeleton, especially when blended with cementitious materials. Using response surface method, this study focused on studying effects single and systems, comprising cement (0% 20%), slag nanosilica 2.4%), properties wet conditions [water-to-soil ratio...

Abstract This study explores incorporating self-healing mechanisms into concrete to address cracks compromising structural integrity. Two techniques, autogenous and autonomous, are compared. Specimens with excessive cement were created investigate the impact of content on healing. The autonomous technique used Bacillus subtilis bacteria a constant concentration, using two insertion methods: direct immobilization. Crumb rubber was immobilize bacteria, assessing its effect in preserving them...

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The shift towards performance-based standards and specifications for concrete requires the development of holistic tests that better correlate to field conditions, which can reliably evaluate performance normal emerging types concrete. In current study, response, in terms physico-mechanical properties microstructural features, made with different cement (general use [GU] Portland limestone [PLC]) without or fly ash nanosilica chloride-based de-icing salts (individual combined) was assessed...

Concrete deterioration in cold climate regions is a great concern from durability perspective because of deicing salts and freezing–thawing (F/T) cycles. This study investigates the response, terms physicomechanical properties microstructural features, concrete made with different types cement—general use cement portland limestone (PLC)—without or fly ash nanosilica to F/T cycles combined concentrations chloride-based (MgCl2 CaCl2). The results reveal that resistance exposed function...

At temperatures below 60?C, the best way to use geothermal sources for heating is heat pumps. A pump can provide air conditioning a residential, commercial, etc., all year round by in winter and cooling summer using low temperature source. Also, be used water distillation through evaporation. The ground source with high COP thermal energy one of technologies RES. In present study, effects changing ambient soil on pump?s overall efficiency are investigated simulated an economizer. system?s...

Signs of premature deterioration are customarily observed in areas adjacent to joints concrete pavements. These areas, especially cold regions, continue hold water/solution (due application deicing salts) long after wetting events. This solution can contribute the process by physical or chemical mechanisms. Until now, root causes joint not fully understood because a multitude reactions and mechanisms may be responsible for this deterioration. The goal study is use forensic evaluation...

Protection of the surface layer concrete is essential for achieving durability and functionality elements during their service life. In this paper, an effort made to utilize colloidal nano-silica (5%–50%) a synthesized nanocomposite as superficial treatments concrete; silane was used neat resin disperse nano-montmorillonite particles at different dosages (5% 10%). The coatings were applied typical mixture residential in North America. transport properties treated characterized using rapid...

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Ultrafine nanosilica particles have the potential to produce concrete under low temperatures. In this study, nanomodified was cured freezing temperatures (−10°C and −20°C) using insulation blankets without or with phase change material as conventional hybrid protection methods, respectively. Six mixtures, incorporating general use high early strength cements, fly ash (20%), (6%), cold weather admixture system (antifreeze/accelerator), were tested. The mixtures assessed based on setting...

Chloroquine phosphate (CQP), an antimalarial medication, has been determined using two straightforward, sensitive, quick, and verified spectrophotometric techniques. The procedures were based on the generation of charge transfer complexes in methanol utilizing alizarin red S (ARS) quinalizarin (Quinz) as chromogenic reagents, respectively, with absorption maxima at 560 531 nm for each. Investigated was optimization reaction conditions, including kind solvent, reagent concentration, time....

Inferior quality of concrete surface layers can lead to significant deterioration infrastructure due the infiltration fluids and deleterious substances from surrounding environment. Concrete structures such as foundations, abutments, flatwork, underground tanks in agricultural mining zones, well slabs factories producing ammonium-based fertilizers, are highly susceptible ammonium sulfate attack, which is known most aggressive driven by acid-sulfate reactions. Coatings an effective strategy...