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Properties Of Concrete

Nanotechnology in concrete – A review

Use of recycled plastic in concrete: A review

One dimensional nanostructured materials

Graphene oxide (GO) is the product of chemical exfoliation of graphite. Due to its good dispersibility in water, high aspect ratio and excellent mechanical properties, GO is a potential candidate for use as nanoreinforcements in cement-based materials. In this paper, GO was used to enhance the mechanical properties of ordinary Portland cement paste. The introduction of 0.05 wt% GO can increase the GO-cement composite compressive strength by 15-33% and the flexural strength by 41-59%, respectively. Scanning electron microscope imaging of the GO-cement composite shows the high crack tortuosity, indicating that the two-dimensional GO sheet may form a barrier to crack propagation. Consequently, the GO-cement composite shows a broader stress-strain curve within the post-peak zone, leading to a less sudden failure. The addition of GO also increases the surface area of the GO-cement composite. This is attributed to increasing the production of calcium silicate hydrate. The results obtained in this investigation suggest that GO has potential for being used as nano-reinforcements in cement-based composite materials.

Mechanical properties and microstructure of a graphene oxide-cement composite

Bridges are exposed to various kinds of external loads, including vehicle and hurricanes, during their life cycle. These loads cause structural damage, which may lead to bridge collapse. To ensure bridge safety, it is essential to periodically inspect the physical and functional conditions of bridges. The displacement responses of a bridge have significance in determining the structural behaviors and assessing their safety. In recent years, many researchers have been studying bridge displacement measurements using image processing technologies. Image-processing-based displacement measurements using a computer analysis system can quickly assess bridge conditions and, thus, can be used to enhance the reliability of bridges with high accuracy. This paper presents a method based on multiple-image processing bridge displacement measurements that includes enhanced robustness to image rotation. This study applies template matching and a homography matrix to measure the displacement that works well regardless of the angle between the smartphone camera and the target.

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Computer vision-based bridge displacement measurements using rotation-invariant image processing technique

This paper presents the results of experimental investigation carried out to assess the effect of crystalline admixture-a self healing admixture (SHA) on the physical and mechanical properties of mortars. Crystalline admixture (CA) totaling 3% by weight of cement was added into cements and lime mortars. The porosity and water absorption capacity was significantly reduced for mortars with SHA. An overall improvement in compressive and flexural strength was observed with the inclusion of SHA. An increase in modulus of elasticity and reduction in brittleness factor was observed for mortars with SHA. Effect of sand gradation was also found prominent on physical and mechanical properties of mortars.

Effect of incorporation of self healing admixture (SHA) on physical and mechanical properties of mortars

A proximity warning system to detect the presence of a worker/workers and to warn heavy equipment operators is highly needed to prevent collision accidents at construction sites. In this paper, we developed a robust construction safety system (RCSS), which can activate warning devices and automatically halt heavy equipment, simultaneously, to prevent possible collision accidents. The proximity detection of this proposed system mainly relies on ultra-wideband (UWB) sensing technologies, which enable instantaneous and simultaneous alarms on (a) a worker’s personal safety (personal protection unit (PPU)) device and (b) hazard area device (zone alert unit (ZAU)). This system also communicates with electronic control sensors (ECSs) installed on the heavy equipment to stop its maneuvering. Moreover, the RCSS has been interfaced with a global positioning system communication unit (GCU) to acquire real-time information of construction site resources and warning events. This enables effective management of construction site resources using an online user interface. The performance and effectiveness of the RCSS have been validated at laboratory scale as well as at real field (construction site and steel factory). Conclusively, the RCSS can significantly enhance construction site safety by pro-actively preventing collision of a worker/workers with heavy equipment.

Robust Construction Safety System (RCSS) for Collision Accidents Prevention on Construction Sites.

With the aim to speed up the construction process, utilization of the hydrogen-rich water as a cement set accelerator would be a unique approach. The investigation deals with the effectiveness of the hydrogen-rich water in controlling the setting and the hydration behavior of cement. Analyzing the setting time using Vicat apparatus, the initial and final setting time of the control cement is measured to be 197 ± 6 and 257 ± 3 min, respectively, while the same is measured to be 8 ± 3 and 14 ± 3 min, respectively, for the 0.5 ppm hydrogen-rich water-based cement sample. The change in surface potential of the hydrogen-rich water based cement paste may lead to agglomerate the cement particle immediately. Additionally, the hydration test reveals that the hydrogen-rich water accelerates the cement hydration reaction. This phenomenon is primarily governed by the rapid dissolution of the cement component, followed by the early nucleation and flocculation of the hydrated products, which is confirmed monitoring the...

Byung-Wan Jo

Papers

Computer vision-based bridge displacement measurements using rotation-invariant image processing technique

Effect of incorporation of self healing admixture (SHA) on physical and mechanical properties of mortars

Robust Construction Safety System (RCSS) for Collision Accidents Prevention on Construction Sites.

Hydration Mechanism of the Hydrogen-Rich Water Based Cement Paste

Arduino-based intelligent gases monitoring and information sharing Internet-of-Things system for underground coal mines