Advanced Materials Research Vol. 935

Abstract: CFRP strengthened reinforced concrete (RC) beams are usually tested under either three points or four point concentric loads; the effect of eccentricity is neglected in many studies. In this experimental program eight RC beams tested in two groups, GROUP ‘A’ & ‘B’. In group ‘A’ four RC beam tested, one control beam tested under concentric load and three under the eccentricity of 40, 60 and 80 mm respectively. The remaining four RC beams in group ’B’ strengthened using carbon fibre reinforced polymer (CFRP) strip and tested under the 60mm eccentricity. The experiment has confirmed the behaviour transformation from flexure failure to local failure due to variation in eccentricity. Therefore, the effects of eccentricity cannot be neglected and required special consideration before applying strengthening scheme on RC beam. The RC beams strengthen using CFRP have the ability to enhanced the load carrying capacity of beams tremendously, but the eccentric load effect on ductility, and failure mode of RC beams.

Abstract: Bracing of foundation pit design proposal based on the excavation near a block of Suzhou Rail Transit Line 1 is used to build a subway tunnel-pit-envelope three-dimensional computational model, which is analyzed by FLAC^3D, software for numerical simulation analysis, to evaluate the impact of the foundation pit excavation on the deformation of the subway tunnel. The calculated results show that: when the pit is excavated to the bottom, the deformation of the tunnel achieves the maximum value, 0.6mm of y direction and 6.54mm of z direction. The pipelines with shallow depth are subject to the deformation caused by the soil subsidence back of the envelope, whose maximum value has reached 7.6mm beyond the control standards. In terms of the deformation of the subway tunnel structure, the deformation can meet the control requirements, and have a certain margin of safety.

Abstract: In this research, to present a practical solution for disposal of Waste Non-metallic printed circuit board fractions (NMPCB), this material replaced 5, 10, 15 and 20% by weight of the coarse aggregate of control concrete. Results showed that consistency of fresh concrete decreased with increase in replace percentage. Bulk density of specimens falls by using (NMPCB), Compressive strength, static modulus of elasticity and flexural strength have decreased in specimens containing waste material. Durability properties, water absorption has increase, and Special electrical resistance has decrease in specimens containing (NMPCB). So, by notice to experimental results and environmental effect of (NMPCB), the best replacing percentage of (NMPCB) with coarse aggregate of control concrete is up to 10%.

Abstract: In order to eliminate the main problems of clean water shortage and fine aggregate in the low land areas and the distant islands, it is purpose to utilized the sea water, marine sand and Portland composite cement to produce the high performance Self-Compacting Concrete (SCC), where Portland composite cement containing of fly ash. The evaluation result on the mix design, workability (slump flow, segregation), mechanical properties (compressive strength-static modulus) and hydration process of SCC were discussed.

Abstract: New building materials alien & large-scale aluminum/wood window with the features of different shapes and large scale is a new direction in the application of civil and commercial building. The traditional method of construction and installation is prone to a lot of quality issues. If measures cannot be promptly taken to deal with or prevent these aspects, which will inevitably affect use function, durability and aesthetics, while maintenance is difficult, meantime resulting in increased costs. Thus, considering the safe use, durability and exterior performance, the project quality must be improved. This paper makes related research about the quality issues, proposes corresponding solutions and provides a complete set of construction technology processes. At last, through engineering case analysis the economic and social benefits.

Abstract: The thermal properties of the new copper–titania hybrid nanocomposite embedded organic ester phase change material (HNPCM) were analyzed experimentally. The surface functionalized hybrid nanocomposite (HyNC) embedded into the PCM has effectively created the densely packed network of thermal interfaces in the PCM matrix layers. The experimental results suggest that, the incorporation of the HyNC has enabled the HNPCM to exhibit improved thermal conductivity (0.347 W/m K), congruent phase transition temperature (freezing: 33.53ᵒC, melting: 35.32 ᵒC), high latent heat capacity (freezing: 109.05 kJ/kg, melting: 109.14 kJ/kg) and considerable reduction in (freezing time: 21.2%, melting time: 29.2%). The improved thermal properties being achieved facilitate the HNPCM to be considered as a viable thermal storage material for high performance and sustainable building cooling and heating applications.

Abstract: This research intended to study the suitability of domato stone (quartzite dolomite) as coarse aggregate and the potential use of liquid Asbuton (BNA liquid) as bituminous binder to produce the porous asphalt. A part of the present study provided the information concerning the rheological properties of BNA liquid. The other part reported the porosity, stability, flow, indirect tensile stress and material loss of porous asphalt.

Abstract: The Skeleton-Infill residential building system has its particular advantages in building industrialization. In order to utilize this building type into high rise residential buildings, this paper proposes a calculation model for the frame-shear wall load bearing skeleton structure with limited floor stiffness. A simplified calculation method adopting ODEs is also demonstrated. A numerical example is proceeded to verify the effectiveness and accuracy of this methodology.

Abstract: To find out practical design of high-rise building external wall fire protection, a preliminary study of water spray curtain was performed. The characteristic of the spray was analyzed through experiments. Basic characteristics such as exponential relationship between discharge rate and working pressure of the nozzle were obtained. The spread behavior of water film on the wall, such as spread width, was tested and analyzed. Feasible design and apply layout of the spray system on external wall was presented. The probable design was proved to be much more energy-saving than traditional sprinklers. In the end, a workable pattern of application was presented and further explained how the design worked and reduced construction energy.

Abstract: High density of population and vertical buildings seems to be the only aspect fit to the concept for city in the developing country. The vertical housings then become a matter of necessity in high density area, in which the building groups themselves significantly contribute to microclimate at urban scales. This study is going to give descriptions of outdoor thermal comfort of public housing in Bandung by means its correlation between urban forms and mean radiant temperature. A number of simulations have used ENVI-met to reveal a better urban form which addresses the role of urban physics in the study of outdoor thermal comfort in a hot humid climate area.