Geopolymer concrete (GPC), also known as an earth friendly concrete, has been under continuous study due to its environmental benefits and potential a sustainable alternative conventional construction. However, there is still lack of comprehensive studies focusing on the influence all design mix variables fresh strength properties GPC. GPC relatively new material in terms field application yet secure international acceptance construction material. Therefore, it important that be carried out...

This study aims to assess the mechanical performance of functionally graded concrete (FGC) in comparison conventional plain cement (PCC) and fibre-reinforced (FRC). For this purpose, five mixes were prepared, defined eleven patterns, including PCC as a control mix, two FRC mixes, eight combinations for FGC mixes. The hooked-end steel fibres recycled thin polyethylene terephthalate (PET) strips from used bottles utilized 0.75 % volume mix natural aggregates replaced by 15 weight with plastic...

Bentonite is one of the SiO2-rich pozzolanic clay types that has been enormously employed as a cost-effective and eco-friendly supplementary cementitious material in ordinary Portland cement (OPC) concrete. However, use bentonite geopolymer concrete (GPC) not explored very widely. Further, research available on effect utilizing treated GPC limited. The practical application also limited due to its significant shrinkage high brittleness compared OPC There are several studies have highlighted...

In this study, bentonite (a naturally occurring pozzolana) was incorporated as a partial replacement (up to 20%) for high-calcium fly ash (HCFA)-based geopolymeric natural aggregate concrete (GNAC) and recycled (GRAC). The mechanical (compressive strength splitting tensile strength), durability (chloride migration coefficient, water absorption, acid attack resistance), rheological properties (slump test, fresh density, workability) were investigated. results revealed that incorporation of...

Abstract Pakistan has experienced several devastating earthquakes, including the 2005 Kashmir earthquake, which resulted in significant loss of life and damage. Mingora City, located Seismic Zone 3, is particularly vulnerable requires seismic evaluations retrofitting buildings to prevent future casualties building collapses. Due high costs complexity assessments, it impractical assess all buildings. This study used FEMA P-154 Rapid Visual Screening (RVS) method 210 The also examined local...

The purpose of this research is to study the effects quarry rock dust (QRD) and steel fibers (SF) inclusion on fresh, mechanical, microstructural properties fly ash (FA) ground granulated blast furnace slag (SG)-based geopolymer concrete (GPC) exposed elevated temperatures. Such types ternary mixes were prepared by blending waste materials from different industries, including QRD, SG, FA, with alkaline activator solutions. multiphysical models show that binders can enhance mechanical GPC. In...

This study presents the performance of quarry rock dust (QRD) incorporated fly ash (FA) and slag (SG) based geopolymer concretes (QFS-GPC) exposed to ambient elevated temperatures. A total five QFS-GPC mix types were prepared. The quantity FA (50%) was kept constant in all mixes, SG replaced by 5%, 10%, 15%, 20% QRD. fresh, hardened properties viz., workability, compressive strength, splitting tensile flexural strengths, XRD for identification reaction phases evaluated. prepared mixes also...

This paper presents an experimental investigation to assess the influence of soil–structure interaction (SSI) on unreinforced masonry structure under train-induced vibrations. For this purpose, a near railway line was instrumented and monitored when subjected five traffic The measured vibrations were used estimate modal properties using frequency domain decomposition technique. variation in estimated against varying excitations indicated that dynamic response depends source excitation. Two...

This paper presents the operational modal analysis of a 90-m-high RC minaret an iconic mosque considered as landmark city. The was monitored for three days with 11 tri-axial MEMS accelerometers. purpose study to observe behavior, develop representative finite element (FE) model, and establish baseline data health monitoring studies. properties were extracted using techniques (OMA): Enhanced Frequency Domain Decomposition (EFDD), Stochastic Subspace Identification (SSI), Natural Excitation...

This paper presents system identification and numerical analyses of a three-story RC building. System was performed using 50 earthquake response records to obtain the frequencies damping ratios, taking into account soil–structure interaction. Trends in resonant parameters were correlated with peak accelerations at roof level. A general trend decreasing increasing level observed quantified, whereas for no clear trends discernible. series finite element models (FEMs) building updated...

The change in the dynamic behaviour of reinforced concrete (RC) structures after fire events is still an unsolved issue for research communities and regulatory authorities. To fill gap, this paper presents experimental results shift characteristics a single scaled-down two-storey RC structure exposure to short long-duration real fires. having normal strength was constructed well-instrumented with temperature sensors obtain large database profiles compartment various element sections. Short...

Geopolymer concrete, also known as an earth-friendly has been under continuous study due to its environmental benefits and a sustainable alternative conventional concrete construction. The supplies of many source materials, such fly ash (FA) or slag (SG), produce geopolymer (GPC) may be limited; however, quarry rock dust (QRD) wastes (limestone, dolomite, silica powders) formed by crushing rocks appear virtually endless. Although significant experimental research carried out on GPC, with...

This paper presents analyses of the seismic responses two reinforced concrete buildings monitored for a period more than years. One structures was three-storey (RC) frame building with shear core, while other RC without core. Both are part same large complex but seismically separated from rest it. Statistical analysis relationships between maximum free field accelerations and at different points on conducted demonstrated strong correlation those. System identification studies using recorded...

This paper presents a study of the variation natural frequencies and damping ratios reinforced concrete building identified from earthquake records during period four years. The three storey is instrumented with five tri-axial accelerometers. state-space subspace system identification technique was used to ascertain considering 50 recorded response time histories. Correlations were developed between peak ground acceleration at base level roof ratios. It found that modal characteristics are...

This study investigated the effects of steel fibers on fresh and hardened properties, heat hydration concrete containing FA (Fly Ash). A total 192 samples were cast comprising cubes, cylinders, prisms, for six mixes with varying contents by volume a fixed content i.e. 15% weight cement. The semi adiabatic setup was used to monitor temperature rise due in fourteen days. use increased workability, decreased early compressive strength, tensile strength concrete. However, an increase observed...

The paper describes a short theoretic study into the flux reversal machine and its potential as high-torque drive motor when compared to other motors, especially switched reluctance machine. literature on this type of is scarce there still little development equivalent circuit design criteria necessary formulate design-office procedure for developing such motors. fundamental concepts operation highlight that are important good A using finite element analysis SPEED software. first studied was...

This paper presents a study on the seismic response trends evaluation and finite element model updating of reinforced concrete building monitored for period more than two years. The three storey is instrumented with five tri-axial accelerometers free-field accelerometer. time domain N4SID system identification technique was used to obtain frequencies damping ratios considering flexible base models taking into account soil-structure-interaction (SSI) using 50 earthquakes. Trends variation...

This paper presents a study on the seismic response trends evaluation and finite element model updating of reinforced concrete building monitored for period more than two years. The three story is instrumented with five tri-axial accelerometers free-field accelerometer. time domain N4SID system identification technique was used to obtain frequencies damping ratios considering flexible base models taking into account soil-structure-interaction using 50 earthquakes. Trends variation were...

Geopolymer concrete (GPC) has been the subject of ongoing research as a suitable substitute for conventional production because its benefits environment. However, there is little regarding retrofitting structural part if GPC member fails. The current study thus concentrates on damaged members/columns. For this purpose, twelve columns which include four CC columns, Columns, and FRGPC were retrofitted with CFRP sheets tested in electrohydraulic testing apparatus (5000 kN). results showed...