The susceptibility of structural concrete to early-age cracking depends on material composition, methods of processing, structural boundary conditions, and a variety of environmental factors. Computational modeling offers a means for identifying primary factors and strategies for reducing cracking potential. Herein, lattice models are shown to be adept at simulating the thermal-hygral-mechanica...

This paper presents the residual mechanical properties of concrete made with crushed bricks and clay roof tile aggregates after exposure to high temperatures. One referent mixture and eight mixtures with different percentages of replacement of natural aggregate by crushed bricks and roof tiles are experimentally tested. The properties of the concrete were measured before and after exposure to 2...

This letter demonstrates the potential for using diffuse ultrasound measurements to detect damage in concrete. Two different solutions to the diffusion equation, an infinite three-dimensional (3D) volume model that neglects geometric boundaries and a finite 3D cuboid model, are used for the required curve fitting procedure to determine the influence of geometric boundaries on the solution. The ...

procedure for integrating 3D positional information for isolated feature-points, extracted from a sequence of images, has been described in a previous paper. The following is a brief outline of the method: When integrating visual features into 3D for a Structure From Motion algorithm, the connectivity and relationships of features are an important adjunct to any quantitative 3D geometry. This p...

Three types of geosynthetic are used in this study to stabilize recycled ballast in the laboratory model. The compressive strength of recycled aggregate concrete is relatively lower up to 15% than natural aggregate concrete. The durability parameters confirms suitability of RCA & RAC in making durable concrete structures of selected types. The weakest specimens tested obtained maximum compressi...

We analyze a signature scheme described in a recent Internet Draft, and highlight a variant (based on prior work of Micali and Leighton) that offers improved concrete security.

Recycled demolished concrete (DC) as recycled aggregate (RA) and recycled aggregate concrete (RAC) is generally suitable for most construction applications. Low-grade applications, including sub-base and roadwork, have been implemented in many countries; however, higher-grade activities are rarely considered. This paper examines relationships among DC characteristics, properties of their RA and...

Concrete box-girder structure is considered the thin-walled structure, undergoing deformation and forces, as well having structural rigidity in three dimensional directions. However, it’s commonly modeled 1D for sake of design practicality, which influences numerical result its dynamic properties when compared to both real time SHMS field test result. To see how far difference between 1D, 2D, 3...

Infilled frame structures are commonly used in buildings. Masonry infilled RC frames are the most common type of structures used for multi-storeyed constructions in the developing countries, even in those which are located in seismically active regions also. Masonry infill walls are mainly used to increase initial stiffness and strength of reinforced concrete (RC) frame buildings. In the presen...