Effect of Using Ground Granulated Blast Furnace Slag in Rigid Pavement Overlays

Cement is replaced with Ground Granulated Blast Furnace Slag (GGBS), to produce a cost effective concrete and to gain effective compressive strength. It is produced in iron manufacturing industries. It has pozzolanic properties and has particle size less than 90μ. In this experimental study, cubes of size 150×150×150 mm and cylinders of 150 mm dia and 300 mm height were casted byreplacing GGBS from dosage of 8% up to 65% for curing period of 7days, 14days, 28days and 56days for M 40 grade concrete. Also, Alccofines were added in addition in varying percentage of 3%, 6%, 9% and 12% in order to gain high early strength and increase the workability. Hyper-Plasticizers were also added in order to reduce the water-content of the concrete. The results of GGBSCC were compared with that of normal concrete results.

Locating Charcoal Production Sites in Sweden Using LiDAR, Hydrological Algorithms, and Deep Learning

Over the past several centuries, the iron industry played a central role in the economy of Sweden and much of northern Europe. A crucial component of iron manufacturing was the production of charcoal, which was often created in charcoal piles. These features are visible in LiDAR (light detection and ranging) datasets. These charcoal piles vary in their morphology by region, and training data for some feature types are severely lacking. Here, we investigate the potential for machine automation to aid archaeologists in recording charcoal piles with limited training data availability in a forested region of Jönköping County, Sweden. We first use hydrological depression algorithms to conduct a preliminary assessment of the study region and compile suitable training data for charcoal production sites. Then, we use these datasets to train a series of RetinaNet deep learning models, which are less computationally expensive than many popular deep learning architectures (e.g., R-CNNs), allowing for greater usability. Together, our results demonstrate how charcoal piles can be automatically extracted from LiDAR datasets, which has great implications for improving our understanding of the long-term environmental impact of the iron industry across Northern Europe. Furthermore, our workflow for developing and implementing deep learning models for archaeological research can expand the use of such methods to regions that lack suitable training data.

Sequestration of Carbon Dioxide Using Ground Granulated Blast Furnaces Slag and kaolin mixtures

<p>Mineral carbonation has been utilised extensively worldwide as the most important way of permanently sequestering carbon dioxide (CO2). This study objective includes sequestering of CO2 gas from atmosphere via carbonation of magnesium and calcium. Waste materials such as ground granulated blast furnaces slag (GGBS) extracted through iron manufacturing as well as brown kaolin mixtures were employed. Acid digestion method as well as thermogravimetric analysis were employed to quantify CO2 sequestered by GGBS-kaolin mixtures.The outcomes indicated that the acid digestion technique is more dependable compared to TGA in measuring CO2. Nonetheless, both methods deduced that the quantity of CO2 sequestered is about 5% from the total dry mass of the mixtures. Thus, GGBS-kaolin mixtures effectively sequester a substantial quantity of CO2.</p>

Combining Proto-Scandinavian loanword strata in South Saami with the Early Iron Age archaeological material of Jämtland and Dalarna, Sweden

In this article, I will examine South Saami prehistory from the perspectives of archaeology and historical lexicology. I will present a theoretical model that can be applied to a multidisciplinary research that uses methodologies from both the sciences and test it using South Saami material. My linguistic data consists of North-West Germanic and Early Proto-Scandinavian loanwords in South Saami. These loanword strata can be dated to 1–550 CE. I will make an inventory of the semantic categories of the words in the loanword strata to see from which domains words were borrowed. I will also examine the prominent individual words that might have significance as intercultural markers. The archaeological material used in the research includes hunting ground graves, iron manufacturing sites and dwelling sites in Dalarna and Jämtland, Sweden. I will consider remain types, artefact finds and remain structures dated to 1–550 CE. Only those sites that have been excavated will be included in the data. I will correlate the lexical finds with the archaeological find groups in order to examine what the datasets together reveal about contacts between the South Saami and Scandinavian speakers. The combination of archaeological and lexical research gives new advantages and perspectives to the study of prehistory. The study brings new evidence for the prior hypothesis about South Saami speakers as domestic animal herders. The combination of the sciences also reveals that the earliest hunting ground graves should be considered to have belonged to a non-Saami speaking Paleo-European people.

The transformation of the organic energy system: the Swedish perspective

This article discusses the historical conversion of the Swedish organic energy system into a mineral one. The main argument is that there was a dynamic interaction between the two systems during the Swedish industrialization process. For one, growth of the mineral energy system contributed to open previously inaccessible organic resources in the forests of northern Sweden. Secondly, the development of the pulp and paper industry contributed to the switch from charcoal to coke in the iron manufacturing industry. Thirdly, the development of hydropower, itself an organic source of energy, further contributed to the emergence of a mixed energy system. One can therefore perceive the Swedish transition from an organic to a mineral energy system as a shift from a traditional organic energy system to an industrialized one, that is, an organic energy system dependent on the technologies and organizational structures of the mineral energy system in order to function.

China: The Incomplete Transition

China’s technological precocity in iron manufacturing, transportation, maritime shipping and navigation, weaponry, market commercialization, and agriculture cannot be denied. Nor can it be denied that European industrialization borrowed extensively from Chinese practice. The problem, however, is that there was no energy revolution in China prior to the mid-nineteenth century, at which point Britain had outpaced China. The Chinese use of coal, petroleum, or natural gas, however early, did not constitute an energy revolution. Moreover, China’s expansion of iron production volume per se did not equate to an industrial revolution. What was needed for a breakthrough to sustained industrialization was the marriage of an energy transition and new technology that demanded greater energy inputs and yielded greater productivity as a consequence. China failed to achieve a full break from the constraints of the agrarian economy and this chapter is about why.