Effect of aggregate size on water distribution and pore fractal characteristics during hydration of cement mortar based on low-field NMR technology

This study proposed a novel method for recycling cathode ray tube (CRT) glass as heavy aggregates to prepare radiation shielding concrete (RSC). Microstructure, physical properties, radiation shielding characteristics, as well as economic and environmental benefits of CRT glass-based RSC were evaluated. Compared to conventional RSC, the CRT glass-based RSC showed a 13.8 % higher gamma ray shielding capacity. Although the mechanical properties of CRT glass-based RSC slightly decreased by 25.7 % due to the weak interfacial transition zone, the 28-day compressive strength of CRT glass-based RSC still fulfilled the requirement of criteria (> 30 MPa). Based on the cost-benefit assessment, there was 166.7 $/m3 profit in CRT glass-based RSC. Furthermore, CRT glass-based RSC demonstrated 47.7 % and 37.0 % reduction in fossil fuel depletion and carbon emissions compared with barite-based RSC. 

Value-added recycling of cathode ray tube funnel glass into high-performance radiation shielding concrete

Discrete element analysis of the effect of aggregate morphology on the flowability of self-compacting concrete

The sustainable performance of asphalt pavement depends on the quality and mix design of road aggregates. Identifying aggregate morphology and size is a prerequisite step for material design and numerical modeling of asphalt mixtures. The paper aims to review the morphometric measurement, characteristic parameters and visualization technique of road aggregates. Types, calculation methods and advantages of aggregate morphological characteristics are highlighted. The applications of aggregate morphological features on the volumetric design, compaction processes, mechanical properties and size effect of asphalt mixtures are summarized. Although digital image processing technology has been studied for years, aggregates in the complex accumulation are still difficult to measure accurately. In the current research, the morphological parameters of aggregates remain diverse without a standard protocol. Compared to theoretical models, numerical models have more difficulties establishing irregular morphology features in the simulated specimens but provide a volume parameter closer to the real value. The future investigation of road performance under dynamic loading should account for the microscopic evolution of shape, orientation and distribution of aggregates over time.

https://www.mdpi.com/2076-3417/12/20/10571/pdf?version=1666614289

Review of Visualization Technique and Its Application of Road Aggregates Based on Morphological Features

A review on the simulation of aggregate morphologies in mixture performances based on discrete element method

Effect of aggregate morphology characteristics on the voidage of aggregate loose packing based on 3D discrete element method

The utility model discloses a high tension power line patrols and examines robot, hinder arm mechanism more including three walking, the walking hinders arm mechanism more and includes the arm body, concertina movement's retractable driving mechanism about the drive arm body, the palm mechanism that can open and shut, palm mechanism includes the first palm and the second palm of the relative setting of being opened and shut by the mechanism controls that opens and shuts, it includes the second lead screw to open and shut the mechanism, the 2nd driving motor, fix the second screw on the second lead screw, fix two connecting plates on the second screw, fix respectively first palm and second -hand's palm and respectively with two pins of two connecting plate sliding connection, a slide rail, drive the guide slot that has the slope to set up on the connecting plate, the pin is worn to establish and is slided in this guide slot and along the guide slot, first palm and second palm are installed and are moved on the slide rail and along the slide rail The utility model discloses simple structure, maintain convenient, patrol and examine the high efficiency, the barrier is stable more, is favorable to the safe high efficiency of the high tension power line work of patrolling and examining to be gone on

High tension power line patrols and examines robot

The utility model provides a desk -top nut ware that shells, which comprises a bracket, the support below is equipped with the base, and the top is equipped with the platform, is equipped with rolling machine above the platform, rolling machine is including articulating the clamp plate in platform one end, and the clamp plate other end is equipped with reset spring and stopper between for expansion end and platform, the stopper passes the platform upper surface, is located the reset spring inner chamber with platform screwed connection, from bottom to top, and articulate at the top of clamp plate expansion end, the eccentricity pressure wheel of support one end, the central point of eccentricity pressure wheel puts and is fixed with the depression bar. The tempering -preventing feeding device in the utility model is advantaged by simple, compact, and reasonabl. It is easy -to -use, can roll a plurality of nuts simultaneously, once obtain a plurality of uts, labour saving and time saving, the secondary of having avoided the shell to splash is arrange in order to can obtain complete ut, improve the yield of ut, be suitable for the popularization.

Desk -top nut ware that shells

You 11.00R20 tire shoulder suffered hyperthermia and periodic alternating stress will easily result in rubber aging and cracking, then the flaw generate in it. In this paper, based on ANSYS Workbench, a local sub-model of the 11.20R20 tire shoulder is established. And the stress, deformation and displacement of the sub models containing cracks are analyzed by FEA. The types of crack are distinguished in this paper, then tearing energy at crack should be calculated. Moreover, the crack life also be evaluated, so that we can estimate the effect of defect safety performance of tire The Establishment of the Sub-Model In this paper, AutoCAD and SolidWorks are used to build the geometry model of the 11.00R20 tire shoulder [1,2], then the geometry model is imported to ANSYS Workbench, and the finite element model of the tire is built in this software. In the process of building tire model, the geometrically nonlinearity, the material non-linearity and the contact non-linearity are fully taken into consideration. When it comes to composite material, the ACP part, which is designed for analysing composite material component is used to build the mode of the tire. Finally the finite element model is built by assembling the rubber parts and composite material parts. Based on multiscale finite element analysis theory [4], in the tire shoulder we set a radius for 2mm semi-circular three-dimensional crack, using 20 node SOLID186 unit. In ANSYS Workbench, the crack and nearby rubber parts extracted in geometry were built as sub-model, as shown in Figure 1. Fig. 1. Tire shoulder sub-model with crack. Fig. 2. Tire shoulder sub model with crack. 884 Advances in Engineering Research (AER), volume 105 3rd Annual International Conference on Mechanics and Mechanical Engineering (MME 2016) Copyright © 2017, the Authors. Published by Atlantis Press. This is an open access article under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/). Analysis Result of the FEA Stress Analysis Fig. 3. Von-Mises stress under 100% load Fig. 4. Von-Mises stress under 110% load Fig. 5. Von-Mises stress under 120% load Fig. 6. Von-Mises stress under 120% load 885 Advances in Engineering Research (AER), volume 105

/pdf/finite-element-analysis-of-the-effect-of-cracks-in-tire-420cir3au2.pdf

Finite Element Analysis of the Effect of Cracks in Tire Shoulder

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