Development of Performance Properties of Ternary Mixtures: Field Demonstrations and Project Summary

Supplementary cementitious materials (SCM) have become common parts of modern concrete practice. The blending of two or three cementitious materials to optimize durability, strength, or economics provides owners, engineers, materials suppliers, and contractors with substantial advantages over mixtures containing only portland cement. However, these advances in concrete technology and engineering have not always been adequately captured in specifications for concrete. Users need specific guidance to assist them in defining the performance requirements for a concrete application and the selection of optimal proportions of the cementitious materials needed to produce the required durable concrete. The fact that blended cements are currently available in many regions increases options for mixtures and thus can complicate the selection process. Both Portland and blended cements have already been optimized by the manufacturer to provide specific properties (such as setting time, shrinkage, and strength gain). The addition of SCMs (as binary, ternary, or even more complex mixtures) can alter these properties, and therefore has the potential to impact the overall performance and applications of concrete. This report is the final of a series of publications describing a project aimed at addressing effective use of ternary systems. The work was conducted in several stages and individual reports have been published at the end of each stage

Geotechnical and leaching properties of flowable fill incorporating waste foundry sand

Abstract not availableAn Deng and Paul J. Tikalsk

Excess foundry sand characterization and experimental investigation in controlled low-strength material and hot-mixing asphalt

This report provides technical data regarding the reuse of excess foundry sand. The report addresses three topics: a statistically sound evaluation of the characterization of foundry sand, a laboratory investigation to qualify excess foundry sand as a major component in controlled low-strength material (CLSM), and the identification of the best methods for using foundry sand as a replacement for natural aggregates for construction purposes, specifically in asphalt paving materials. The survival analysis statistical technique was used to characterize foundry sand over a full spectrum of general chemical parameters, metallic elements, and organic compounds regarding bulk analysis and leachate characterization. Not limited to characterization and environmental impact, foundry sand was evaluated by factor analyses, which contributes to proper selection of factor and maximization of the reuse marketplace for foundry sand. Regarding the integration of foundry sand into CLSM, excavatable CLSM and structural CLSM containing different types of excess foundry sands were investigated through laboratory experiments. Foundry sand was approved to constitute a major component in CLSM. Regarding the integration of foundry sand into asphalt paving materials, the optimum asphalt content was determined for each mixture, as well as the bulk density, maximum density, asphalt absorption, and air voids at Nini, Ndes, and Nmax. It was found that foundry sands can be used as an aggregate in hot-mix asphalt production, but each sand should be evaluated individually. Foundry sands tend to lower the strength of mixtures and also may make them more susceptible to moisture damage. Finally, traditional anti-stripping additives may decrease the moisture sensitivity of a mixture containing foundry sand, but not to the level allowed by most highway agencies.Structural Engineerin

Influence of portland cement characteristics on alkali silica reactivity

The findings of this study which evaluated 21 portland cements identified K2O and Na2Oeq as significantly contributing to ASR expansion with a less strong correlation to SO3 content The conclusions are based on results of ASTM C 441 Tests. Response surface modeling has identified a negative trend of clinker SiO2 and a direct trend of Na2Oeq as significantly contributing to ASR expansion. The ASTM C 227 analytical results were less conclusive and proved to be a poor indicator of the effects of cement variables in the expansion in tests up to 1 year in duration. In contrast, ASTM C 441 rapidly and clearly delineated the cements contribution to ASR expansion.Structural Engineerin

Run 2 Upgrades to the CMS Level-1 Calorimeter Trigger

The CMS Level-1 calorimeter trigger is being upgraded in two stages to maintain performance as the LHC increases pile-up and instantaneous luminosity in its second run. In the first stage, improved algorithms including event-by-event pile-up corrections are used. New algorithms for heavy ion running have also been developed. In the second stage, higher granularity inputs and a time-multiplexed approach allow for improved position and energy resolution. Data processing in both stages of the upgrade is performed with new, Xilinx Virtex-7 based AMC cards.Comment: 10 pages, 7 figure

MORPHING COMPLIANT TRAILINGEDGE SKIN CONCEPT

Many different concepts for morphing trailing edges (TE) have been investigated during the last decades. Within the internal project morphAIR (Morphing Technologies & Artificial Intelligence Research Group) the German Aerospace Center (DLR) is planning further steps by investigating morphing technologies in scaled flight tests. In these flight tests, major effects of morphing technology are going to be shown. Due to having a small-scale demonstrator, former TE concepts need to be evaluated according to applicability, positive lift to drag (L/D) effects and associated weight penalties. Since large deformations are to be achieved typically in a hingeless-elastic system, high actuation forces are required in order to enable morphing. These internal structural loads are crucial for actuator and kinematic design, thus they are directly related to actuator and kinematic weight. Therefore, it is essential to have a measure of required size and weight during preliminary design processes. Within this work, four different methods are presented to derive the strain energy of a new compliant morphing TE system. Beginning with a geometrical linear analytical approach considering small deformations (Model I), over a nonlinear analytical approach incorporating large deformations (Model II), to geometric nonlinear Finite Element Method (FEM) calculations without (Model III) as well as including Fluid Structure Interaction (FSI) (Modell IV). Results of Modell I to IV are compared according to strain energy and virtual Forces. It has been shown that even Model I shows good correlation of deformations and strain energy

Community Organization: The Issue of the Relocation of the New Jersey College of Medicine and Dentistry in Newark, New Jersey, 1967

Abstract not availabl