The influence of carbonation on corrosion of reinforcement depends on the degree of ease of diffusion of CO2 through the concrete from its surface, also on environmental conditions, on the pore structure of concrete (cement, aggregates, and water (without additives)) and on the W / C, where a high ratio generates porous and permeable mortar and concrete (Duran C., 2003; Troconis O. et al., 2006...

Structural lightweight concrete (SLWC) has superior properties that allow the optimization of super tall structure systems for the process of design. Because of the limited supply of lightweight aggregates in Korea, the development of structural lightweight concrete without lightweight aggregates is needed. The physical and mechanical properties of specimens that were cast using normal coarse a...

Using concrete as a thermal energy storage (TES) material is a promising option for large-scale solar-thermal resource development and utilization. Specific heat is one of the most important characteristics for TES performance. In this paper, the half-open dynamic method based on the mixing principle is proposed and applied to measure concrete-specific heat at temperatures up to 600 ◦C. Measure...

reactive powder concrete (rpc) is an ultra high performance concrete which has superior mechanical and physical properties. the rpc is composed of cement and very fine powders such as crushed quartz (100–600 μm) and silica fume with very low water/binder ratio (w/b) (less than 0.20) and super plasticizer (sp). the rpc has a very high compressive and tensile strength with better durability prope...

This paper presents a novel approach for an automatic and holistic quality assessment of fresh concrete on the construction site. Based low-cost easy-to-mount camera setup, delivering image sequences showing flow during discharge process mixing truck, we propose Concrete Flow Transformer, deep learning based Vision Transformers, online prediction properties. The performance proposed is evaluate...

Multiscale modeling for cement-based materials, such as concrete, is a relatively young subject, but there are already a number of different approaches to study different aspects of these classical materials. In this paper, the parameter-passing multiscale modeling scheme is established and applied to address the multiscale modeling problem for the integrated system of cement paste, mortar, and...

Abstract The method and parameter of mixing are crucial to the quality concrete, ordinary vibratory is beneficial performance which has been explored in numerous studies. In order study influence high-frequency on concrete more accurately, C40, C50 steel fiber C60 high-strength selected make reach experiments article. After determining optimum ratio, contrast experiment forced (which at a given...

Scrap steel fiber concrete (SFRC) is a new kind of material, which uses the scrap from tire as reinforced FRP bar concrete, replacing or partially traditional and synthetic fiber. This paper summarizes research status waste at home abroad, including mechanical properties compressive tensile resistance, mixing amount use requirements fiber, finally development prospect forecasted

In recent years, the Lamb wave analysis by the multi-channel analysis of surface waves (MASW) for concrete structures has been an effective nondestructive evaluation, such as the condition assessment and dimension identification by the elastic wave velocities and their reflections from boundaries. This study proposes an effective Lamb wave analysis by the practical application of MASW to concre...

We analyze the concrete security provided by a signature scheme described in a recent Internet Draft by McGrew and Curcio.