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A Study on the Minimum Paste Volume in the Design of Concrete Mixture
Fowler, David W.,Hahn, Michael De Moya,Rached, Marc,Choi, Doo-Sun,Choi, Jae-Jin Korea Concrete Institute 2008 International Journal of Concrete Structures and M Vol.2 No.2
Optimization of concrete mixing system is very important for the production of quality mixture of concrete and requires very complicated, specialized knowledge as there are a variety of variables that influence the result. One of the methods of optimizing the concrete mixing system is to minimize the volume of cement paste which, in turn, means maximizing the volume of aggregate. The purpose of this study is to determine the minimum volume of cement paste used in the design of concrete mixture and to design the optimum concrete mixing system based on the fluidity of mortar and concrete. In determining the minimum volume of cement paste, experiments of mortar and concrete were performed based on their workability, material segregation and bleeding. Type of aggregate, granularity distribution and sand percentage were used as test parameters and measurements were taken of the distribution of granularity, usage of HRWRA, minimum volume of paste and drying shrinkage and compressive strength of concrete.
Australian Lamb Meat – The Response to Societal and Ethnic Influences
David Laurence Hopkins,Stephanie Marie Fowler 한국축산식품학회 2018 한국축산식품학회지 Vol.38 No.4
Lamb has long been considered a traditional meal within Australia; however as consumer preferences have changed since the 1950’s, consumption of lamb has decreased from the 1980’s. This is the result of changing societal roles, particularly for females, decreasing household sizes and increasing awareness of the impact of food choices on human health. Since the 1980’s improvement of farm practices and increases in genetic gains has addressed part of this decline by increasing the amount of lean meat and decreasing fat in lamb retail cuts. Yet, this has created a challenge for the industry to utilise the larger carcases now being produced. Thus, a whole value chain approach to increasing consumption has been undertaken through several research programs to create cuts which suit the modern consumer, examine nutritional and eating quality and increase adoption of value added cuts. Therefore, this paper outlines this history of changing consumer patterns and the consequent research to address these changes.
The Physical Properties of Granite Microfines and the Workability of Mortar with Granite Microfines
Koehler, Eric,Hahn, Michael De Moya,Trachet, Alison,Rached, Marc,Choi, Jae Jin,Fowler, David Korean Recycled Construction Resources Institute 2009 한국건설순환자원학회지 Vol.4 No.3
This paper summarizes the analysis of granite microfines from California for use in portland cement concrete. For reference, the granite microfines were compared to microfines used in previous International Center for Aggregates Research(ICAR) projects. The particle shape characteristics, based on the packing density results, were assessed and apparent clay content, based on the methylene blue value test, was evaluated. Also, the physical properties of the microfines were confirmed in self-consolidating mortar mixtures.