Wyniki wyszukiwania - BazTech

1

Water absorption, impact resistance and strength reliability of concrete incorporating sintered fly ash aggregate under drop weight impact load

Baskaran Ranjith Babu, Nagarajan M.

Engineering Transactions

|

2023

|

Vol. 71, iss. 2

197--211

EN

ASTM and ACI methods were used to determine the water absorption and impact resistance of M30 grade concrete containing different percentages of sintered fly ash aggregate (SFA) ranging from 20%, 40%, 60%, 80%, and 100%. In the concrete laboratory, the parameters of the concrete mix, including fresh density, slump value, dry density, compressive strength, and impact resistance, were determined. The fresh and dry densities of concrete mix decrease as the quantity of SFA used as substitute increases. The 100% substitution of SFA in concrete results in a slump value of 200 mm, a fresh density of 1946 kg/m3 , a dry density of 1911 kg/m3 , and water absorption of 3.5%, with a compressive strength of 12.3 MPa. For the drop weight impact resistance test, reliability analysis was conducted to determine the level of reliability of each concrete mix for varying SFA. Using reliability analysis, the failure analysis owing to impact load determined the energy absorption of the concrete mix.

2

Performance analysis of flexible pavement with reinforced ash

Subash S. M., Mahendran N., Manoj Kumar M., Nagarajan M.

Archives of Civil Engineering

|

2017

|

Vol. 63, nr 3

149--162

EN

Coal ash produced from thermal power plants as a substitute for conventional construction material has increased considerably in recent years. In the past, studies on partial replacement of soil were carried out with a single type of ash. Because of the insufficient evidence, limited research has been initiated on the productive usage of Fly and Bottom Ashes. This paper aims to study the properties of these materials and investigate their efficacy in road construction. Laboratory investigations were conducted to assess chemical and physical properties and mechanical performance to evaluate both ash types in pavement construction. The rutting factor is calculated for various combinations of coal ash materials with the addition of polypropylene fiber as a reinforcement in increments of 0.1% of its total weight with an aspect ratio of 200. The analytical tool ANSYS is used to validate the service life, vertical strain and quality of reinforced ash materials.

PL

Niniejsze opracowanie zostało poświęcone zastosowaniu podczas budowy dróg materiałów wzmocnionych popiołem jako zamienników pierwotnych surowców. Badania były prowadzone przez ostatnie cztery lata w skuteczny sposób w celu uzyskania pozytywnego wyniku. Wskazówki kolegów oraz doświadczonych profesorów pomagają wypracować właściwe podejście do badań. Ponadto, studenci z PSNACET również odegrali istotną rolę w przeprowadzaniu badań laboratoryjnych. Materiały zastosowane w badaniu obejmowały: popiół denny, popiół lotny oraz włókna polipropylenowe (PPF). Popiół denny jest produktem ubocznym pozyskiwanym w przemyśle energetycznym w wyniku spalania węgla w piecu. Ma kolor czarny oraz szorstką konsystencję ze śladowymi ilościami klinkieru żwiru. Popiół lotny składa się z drobnych cząstek, które są wyjmowane z kotła wraz z gazami spalinowymi. Materiały te są bezpłatnie pozyskiwane od „Neyveli Lignite Corporation”. Włókno polipropylenowe jest polimerem termoplastycznym o wysokiej odporności na działanie substancji chemicznych, kwasów i zasad. Wykorzystywane do badań włókno o współczynniku kształtu wynoszącym 200 pozyskiwane jest z Tashi Reinforcements, Nagpur.

3

Earth observation and geospatial techniques for soil salinity and land capability assessment over Sundarban Bay of Bengal Coast, India

Das S., Choudhury M. R, Das S., Nagarajan M.

Geodesy and Cartography

|

2016

|

Vol. 65, no. 2

163--192

EN

To guarantee food security and job creation of small scale farmers to commercial farmers, unproductive farms in the South 24 PGS, West Bengal need land reform program to be restructured and evaluated for agricultural productivity. This study established a potential role of remote sensing and GIS for identification and mapping of salinity zone and spatial planning of agricultural land over the Basanti and Gosaba Islands(808.314sq. km) of South 24 PGS. District of West Bengal. The primary data i.e. soil pH, Electrical Conductivity (EC) and Sodium Absorption ratio (SAR) were obtained from soil samples of various GCP (Ground Control Points) locations collected at 50 mts. intervals by handheld GPS from 0–100 cm depths. The secondary information is acquired from the remotely sensed satellite data (LANDSAT ETM+) in different time scale and digital elevation model. The collected field samples were tested in the laboratory and were validated with Remote Sensing based digital indices analysisover the temporal satellite data to assess the potential changes due to over salinization. Soil physical properties such as texture, structure, depth and drainage condition is stored as attributes in a geographical soil database and linked with the soil map units. The thematic maps are integrated with climatic and terrain conditions of the area to produce land capability maps for paddy. Finally, The weighted overlay analysis was performed to assign theweights according to the importance of parameters taken into account for salineareaidentification and mapping to segregate higher, moderate, lower salinity zonesover the study area.