ABSTRACT This paper evaluated the incorporation of nanosilica (NS) in rendering mortars produced with recycled fine aggregate (RFA). Initially, a study was carried out on cementitious pastes, replacing Portland cement NS at levels 0%, 0.4%, 0.6%, 0.8%, and 1.0%. The samples were submitted to scattering, rheology, calorimetry, x-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTI...

Mortars intended for plastering and masonry works normally comply to EN 413-1 and/or ASTM C91 specifications. This paper seeks assess the suitability of geopolymers (GPs) composed metakaolin seashell wastes applications. The sodium hydroxide silicate activators contained air-entraining molecules secure about 10% ± 2% air content. Just like cement-based mortars, test results showed that mechanic...

Recently, a novel approach with excellent performance based on the concept of characteristic infiltration time, time method (CTM), is proposed to infer soil sorptivity (S) and saturated hydraulic conductivity (Ks) from one-dimensional (1D) cumulative infiltration. The current work provides simplified version CTM, called SCTM, by eliminating necessity iteration used in CTM providing similar accu...

This paper analyzes field experimental data obtained on about 30 concrete structures, both new (age up to 1 year) and old 60 years). The include in situ non-destructive tests (NDT) of air-permeability kT, electrical resistivity ρ surface moisture m, as well conducted drilled cores: O2-permeability kO, water sorptivity a24, MIP, carbonation rate Kc chloride content Cl at 10 20 mm depth. main con...

Waste plastics may be an environmentally friendly alternative to natural aggregates for concrete manufacture. However, the inferior bond strength between waste plastic and cement matrix greatly limits uses of engineering designs applications. Herein, ethylene–vinyl acetate (EVA) nanosilica (nS) were jointly employed enhance matrix-aggregate interactions in cementitious composites with recycled ...

The present work investigates the mechanical and chemical characteristics durability of high-strength geopolymer concrete (HSGPC) developed using high-volume copper slag micro silica. objective study was to explore feasibility deploying as a replacement for river sand in fabrication concrete. In total, 11 different trials were cast by varying up 100% potential alternative sand. mixture alkaline...

Cover crops (CCs) are known to influence water infiltration just prior termination, but their effects on over time less known. This study investigated the of CCs in situ CC termination (during April) and again 2 mo after June). The multi-species mixture used included hairy vetch (Vicia villosa Roth.), crimson clover (Trifolium incarnatum L.), winter wheat (Triticum aestivum peas (Lathyrus hirsu...

The utilization of expanded polystyrene (EPS) beads in semi-lightweight concrete (SLC) intended for repair and building applications has gained great attention recent years. This study examines the effect mix design parameters including binder content, water-to-binder ratio (w/b), EPS silica fume (SF) additions on mechanical properties durability SLC mixtures. experimental program was carried o...

This research focuses on the investigation of durability behavior and microstructural analysis for M70 grade high-strength concrete (HSC) with influence alccofine, banana fiber (BF), coir (CF). In this investigation, cement was partly supplanted by 15% alccofine content in weight. Two types natural fibers, were selected added at 0.5%, 1%, 1.5%, 2% volume. Durability characteristics, such as lon...

In multispecies electrolyte solutions, each individual species can migrate according to its specific ionic properties. This process is called electrochemical migration or electro-diffusion and well-described by the Nernst–Planck equation. The common approach for solving corresponding mathematical system based on null current (NC) assumption, which expresses electric potential in terms of charge...