Dhanada Mishra | KMBB College of Engg and Tech (original) (raw)

Books by Dhanada Mishra

http://www.nicee.org/IAEE\_English.php

Papers by Dhanada Mishra

HKIE Transactions, Dec 31, 2022

HKIE Transactions

Worldwide there are plenty of aged Reinforced Concrete (RC) buildings in need of thorough inspect... more Worldwide there are plenty of aged Reinforced Concrete (RC) buildings in need of thorough inspections. Cracks, delamination, stains, leakages, debonding and moisture ingressions are common defects found in RC structures. Such problems are typically diagnosed through qualitative assessment of visual and thermal photographs (data) by certified inspectors. However, qualitative inspections are very tedious, time-consuming and costly. This paper presents an alternative novel approach to drastically increase efficiency by decreasing the data collection and analysis time. Data collection for the inspection of facades is undertaken with Unmanned Aerial Vehicles (UAVs) either through an autonomous pre-programmed flight or through a human-piloted flight. Data analysis is performed by implementing up-to-date AI-powered algorithms to automatically detect defects on visual and thermal photographs. All the recognised defects and thermal anomalies are labelled on the building facade for comprehens...

Journal of Advanced Concrete Technology, 2003

The Indian Concrete Journal, 2020

RILEM Technical Letters

Engineered Cementitious Composites (ECC, also known as Strain-Hardening Cementitious Composites o... more Engineered Cementitious Composites (ECC, also known as Strain-Hardening Cementitious Composites or SHCC) are a family of high-performance fibre-reinforced cement-based materials. With the ultimate tensile strain of over 1% and the self-controlled crack width of less than 100 μm, ECC enables high damage tolerance and outstanding durability under various environments for infrastructure. Owing to the absence of coarse aggregates and the low content of fine aggregates, the cement content in conventional ECC can be over 600 kg/m3, which is undesirable for low-carbon buildings and infrastructure. Ultrahigh-volume (over 60%) pozzolan has been explored to produce sustainable ECC. This article reviews recent advances of sustainable ECC with ultrahigh-volume Class F fly ash or limestone calcined clay. These sustainable ECC either match or surpass mechanical properties and durability characteristics of conventional ECC, while their carbon footprint and embodied energy are much lower than those...

Springer Proceedings in Energy, 2022

Fibre Reinforced Cement and Concrete, 1992

A micromechanical model is presented for the uniaxial compressive strength of fiber reinforced ce... more A micromechanical model is presented for the uniaxial compressive strength of fiber reinforced cementitious composites (FRCC). The model is based on the classical models of compressive failure of brittle solids containing sliding microcracks that induce wing- crack growth under compressive loading. The concepts of increased microcrack sliding resistance and wing-crack growth retardation associated with fiber bridging are exploited to produce a strengthening effect of fibers on composite strength. The concept of defect introduction associated with fiber volume fraction is included to produce a composite strength degradation. The combined effects result in a composite compressive strength which increases initially and subsequently drops with increasing fiber content, as has been observed in FRCs reinforced with a variety of fibers. More accurate stress intensity factor calibrations for wing-crack growth and interaction are employed in the present paper. For the covering abstract of the conference see IRRD 862056.

Circular Economy in the Construction Industry, 2021

The Indian Concrete Journal, 2004

Au cours de ces dernieres annees, on a demontre de facon experimentale le comportement de pseudo-... more Au cours de ces dernieres annees, on a demontre de facon experimentale le comportement de pseudo-ecrouissage sous charge en traction directe de composites cimentaires renforces de fibres courtes calcules a l'aide des donnees quantitatives de la micromecanique. Les conditions determinant le comportement ductile de ces composites (ECC) ont ete formulees de facon theorique. Dans cet article, on insiste particulierement sur l'influence des proprietes de la matrice sur le pseudo-ecrouissage du composite. On a entrepris un programme d'essais dans le but de determiner l'influence de la composition des melanges regis par les rapports eau/ciment et sable/ciment sur les proprietes de la matrice. La combinaison des savoirs theorique et experimental ainsi obtenus permet de proposer une procedure innovante concernant le calcul des composites avec differents types de matrice. Cette etude resulte de la necessite de mettre au point une nouvelle classe d'ECC presentant un module ...

Journal of Cleaner Production, 2021

Abstract Replacing half of the clinker by a blend of limestone powder and low-grade calcined clay... more Abstract Replacing half of the clinker by a blend of limestone powder and low-grade calcined clay (in 1:2 weight ratios) has been recently proposed as a new version of economical and green cement named Limestone-Calcined Clay (LC2) cement, also known as LC3. The LC2 blend emits much less carbon dioxide than traditional Portland clinker and has a sufficiently high cementing efficiency factor for maintaining compressive strength under high replacement levels. In this study, the feasibility of blending more than 50% of LC2 in cement was explored in order to achieve greener blended cement. Five LC2 replacement levels were studied, including 25%, 50%, 60%, 70% and 80% by weight of cement. Compressive strength of BS EN 196-1 standard mortar mixes at 3–360 days was evaluated, and the fresh property, hydration heat as well as environmental impact of the blended cement were investigated. The results showed that the blended cements with 50%, 60% and 70% LC2 achieved the compressive strength of 53.6 MPa, 43.9 MPa and 33.4 MPa at 28 days, respectively; thus they fulfill the 28-day strength requirements for 52.5N, 42.5N and 32.5N cements, respectively. The blended cements with 50–60% LC2 had a lower material cost index than Portland cement and blended cement with fly ash. In addition, blended cements with 50–60% LC2 showed lower embodied energy/carbon emission indices at the early age but higher at the later age as compared to blended cements with fly ash. In the context of the substantial contribution of Portland cement manufacture towards the climate crisis, these findings can help the efforts to reduce the carbon footprint in the construction industry.

This study aims to investigate the hydration and strength characteristics of green cementitious m... more This study aims to investigate the hydration and strength characteristics of green cementitious mortars with ultrahigh-volume limestone-calcined clay as well as two kinds of Class F fly ash. Using the ASTM C311 strength activity index test method, the effect of different pozzolan replacement levels of cement (0%, 20%, 50%, and 80%, by weight) were investigated. Compressive strength at 3, 7, 14, 28 and 90 days under standard curing was recorded, and hydration heat of the 20% and 80% replacement mixes was studied using iso-thermal calorimetry. It was observed that the effectiveness of the pozzolan in mortars depends on particle size distribution, glassy or amorphous nature, surface area and replacement level. The sum of all these effects can be captured by the strength activity test only if the standard recommended 20% pozzolan mix is substituted with the actual mix composition. The results in this study provide insights into the mix design and applications of ultrahigh-volume pozzola...

Waste management & research : the journal of the International Solid Wastes and Public Cleansing Association, ISWA, 2018

Safe disposal of fly ash generated by coal-based thermal power plants continues to pose significa... more Safe disposal of fly ash generated by coal-based thermal power plants continues to pose significant challenges around the world and in India in particular. Green structural concrete with 80% cement replaced by local Chinese fly ash has been recently developed to achieve a target characteristic compressive strength of 45 MPa. Such green concrete mixes are not only cheaper in cost, but also embody lower energy and carbon footprint, compared with conventional mixes. This study aims to adopt such materials using no less than 80% fly ash as binder in routine concrete works in countries like India with the commonly used lower target characteristic compressive strength of 30 MPa. It is achieved by the simple and practical method of adjusting the water/binder ratio and/or superplasticiser dosage. The proposed green concrete shows encouraging mechanical properties at 7 days and 28 days, as well as much lower material cost and environmental impact compared with commercial Grade 30 concrete. T...

Indian Concrete Journal

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