Construction wastes have become the major source of solid wastes in Hong Kong. Thousands of tonnes of solid wastes are produced every year from construction and demolition activities. Increasing generation of these wastes has caused significant impacts on the environment and aroused growing public concerns. Therefore, the minimization of construction wastes has become a pressing issue. This pap...

The applications of the deep belief network (DBN) for addressing practical engineering issues have recently emerged all over world thanks to its accuracy and availability data. In this paper, a predictive model using DBN was employed investigate factors that affect ground-penetrating radar (GPR) signals from rebar embedded in concrete structures. Four variables, namely temperature, relative hum...

This study investigated the feasibility of H2 production by acid corrosion, employing a by-product from fertilizer industry (Hexafluorsilic - H2SiF6) and waste iron sources. Different masses metal three different sources: powder (waste workshops), steel wool rebar (construction waste), were reacted with various proportions H2SiF6 HCl. The influence variables was evaluated factorial design, veri...

Depending on the desulfurization reaction temperature, it can be divided into fly ash generated at hightemperature furnace zone and at low-temperature flue gas zone. For simulating those two kinds of desulfurization ash, the ordinary fly ash mixed with different weight percentage of CaSO4·2H2O is divided into 2 groups, the first group is followed by calcining at 900°C, another drying at 100°C. ...

Abstract. Construction progress monitoring is an important process throughout the project timeline towards its successful completion. Among imaging techniques, photogrammetry considered as economical and effective method. However, few studies can be found on construction via photogrammetry; thus, not much guideline available for this domain. This study evaluated tools assessment of rebar grid f...

Grouted sleeve connections have been widely used in precast construction for joining rebar. In order to study their post-fire seismic performance, grouted connections, which are heated first elevated temperature and then cooled down room temperature, tested under both monotonic cyclic loadings. For comparisons, the same tests also carried out on continuous The failure modes, skeleton curves com...

Ultra-high performance concrete (UHPC) has been demonstrated to be a realistic alternative less maintenance and significantly longer service life due its better mechanical properties low permeability. The bond of the deformed steel bar embedded in UHPC is critically important for safety structures. This paper conducted an experimental investigation on behavior bars UHPC. impacts loading method,...