Cement was added to class F type of fly ash in the proportion of 0, 2, 5 and 10 % to study for its suitability as a landfill liner material. Mixtures were compacted to their optimum moisture content (OMC) and maximum dry density (MDD). The results from the consolidation tests showed a relatively lower value of compression index for all the mixtures indicating the settlement due to application of overburden pressure would be small. Hydraulic conductivity of the samples were found to be decreased with the increasing the load. However, none of the mixtures exhibited a hydraulic conductivity value less than 10 -9 m/s, a limiting criterion set by various environmental agencies for the material to be used as a landfill liner. However, mixtures of 90 % fly ash ? 10 % cement compacted at 5 % wet of OMC-MDD exhibited a hydraulic conductivity value less than 10 -9 m/s. On drying, all the mixtures shrunk marginally. The unconsolidated undrained test results indicated that the shear strength parameters increase with increase in the cement content in the mixtures.
There are several commercially marketed corrosions inhibiting admixtures for concrete, presently not tested adequately and lack long term performance results. In this study laboratory studies were conducted on two commercially available Corrosion inhibitors to determine the effectiveness and their corrosion resistance parameters of concrete with OPC and PPC. This study examined the durability parameters in concretes mixed with Anodic Inhibitor (Calcium Nitrite based) and Bipolar Corrosion inhibitor (amino alcohol-based). The Accelerated corrosion testing (Impressed voltage test) was conducted to determine the efficacy of inhibitors. For PPC mixes, the Calcium Nitrite Inhibitor has shown better results in reducing the rate of corrosion of the embedded steel reinforcement. For OPC mixes both the inhibitors have given better results compared to control mix in reducing the corrosion rate of embedded steel.
Disasters due to fire accidents have become frequent resulting in concrete subjected to high temperatures leading to severe loss of life and property. The usage of High Strength Concrete (HSC) as a structural material has led to the demand to understand the effects of fire on concrete. This paper is aimed at understanding the properties of both HSC and normal strength concrete (NSC) at high temperatures. The experimental work mainly focuses on physical & mechanical properties of M20 grade NSC and M60 Grade HSC subjected to high temperatures. Color change, weight loss, crack width, thermal expansion and residual compressive strength were observed under high temperatures ranging from 1000C to 8000C with an increment of 1000C at exposure duration of three hours. The effect of high temperatures on HSC is more prominent than that of NSC. The performance of HSC is marginally poor compared to NSC at temperatures upto 8000C
Outdoor air pollution is a major threat to global public health that needs responsible participation of researchers at all levels. Assessing research output is an important step in highlighting national and international contribution and collaboration in a certain field. Therefore, the aim of this study was to analyze globally-published literature in outdoor air pollution – related respiratory health. Outdoor air pollution documents related to respiratory health were retrieved from Scopus database. The study period was up to 2017. Mapping of author keywords was carried out using VOSviewer 1.6.6. Search query yielded 3635 documents with an h-index of 137. There was a dramatic increase in the number of publications in the last decade of the study period. The most frequently encountered author keywords were: air pollution (835 occurrences), asthma (502 occurrences), particulate matter (198 occurrences), and children (203 occurrences). The United States of America ranked first (1082; 29.8%) followed by the United Kingdom (279; 7. 7%) and Italy (198; 5.4%). Annual research productivity stratified by income and population size indicated that China ranked first (22.2) followed by the USA (18.8).
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