F.C. Sham

TL;DR: Wang et al. as mentioned in this paper developed a handy, reliable and cost-effective method for concrete property evaluation based on an optical technique called automatic digital image correlation (ADIC), which acts as an optical strain gauge.

TL;DR: In this paper, an appraisal of the embodied CO2 emission level of using traditional building materials and alternative building materials (i.e. slag cement, steel, glass and timber) has been made by case modelling.

TL;DR: Based on the proposed computerized tomography reconstruction (CTR) technique, deviated temperature data due to missing temperature data hidden by obstacle can be reconstructed and may have the potential to be applied in the reconstruction of any smooth physical fields like phase information in optical techniques.

TL;DR: In this article, the authors investigated the short term shrinkage and creep of lightweight concrete up to 100 days of designed strengths 25 and 35 MPa and found that the autogenous and total shrinkage of lower strength lightweight concrete were higher.

Abstract: Deterioration of concrete materials is always initiated with the formation of cracks. Therefore, monitoring crack formation and their propagation is crucial in concrete durability assessment. This paper proposes to apply short-duration pulsed thermography - flash thermography (FT) - for surface crack detection. It allows full-field and noncontact qualitative observation of thermal radiation from the object surface and is widely accepted in the aerospace industry. It is superior to the common practice of surface crack detection - visual inspection - since overall inspection time is saved and the maintenance costs are lowered. FT can be employed to detect and monitor a large number of cracks at the same time with just a flash time. A surface crack is detected based on the difference in light and IR radiation reflections between the cracks and intact region. The surface cracks, with widths ranging from 0.04 mm to 0.6 mm, are inspected and the results show that FT can detect surface cracks with widths larger than 0.32 mm successfully without further image processing. First-derivative processing has been applied and finer cracks of widths ranging from 0.04 mm to 0.1 mm can be observed.