Advanced Materials Research Vol. 900

Abstract: A CGF Panel (Concrete Glulam Framed Panel) is a concrete panel with a glued laminated timber frame. The experimentation on this new construction system at LabSCo (Laboratory of Strength of Materials) of IUAV University of Venice, inspired a wide research on buildings made of this construction system investigating in different aspect of building behaviour: particularly about mechanical property of the materials, mechanical of the system and building physics. This paper presents the results of quasi-static in-plane tests on single panel and configurations of some different panels. The tests in the laboratory are used for measuring the in-plane strength and stiffness of individual panels and wall sections consist of some panels in order to verify and measure the behavior of the connections between the various parts of the single panel and the connection between the panels. Thanks to the results obtained it was possible carry out the FE model to calibrate the characteristics in relation to experimental data. Finally, in order to compare this constructive system with the well known X-lam systems, on the basis of the calibration of the models we were able to set up a comparable FE model with those of the X-lam wall described in the publication: "Quasi-Static and Pseudo-Dynamic Tests on XLAM Walls and Buildings " inherent in the SOFIE project coordinated by the CNR-IVALSA (Italian National Research Council - Trees and Timber Institute)

Abstract: This investigation presents some evaluation based on the experimental and numerical results obtained on the compression bearing capacity of new columns prototype made by FRP (Fibre Reinforced Polymer) material and concrete. In detail that is the junction due to the assembly between hollow FRP profiles made by pultrusion process with glass fibres and thermosetting matrix vinylestere, and very light concrete casting inside. To better understand the eventually influence related to the hollow shape employed, the study consider both the case of circular and square profile. Due to the novel of the research, a not negligible part of the research is dedicated to test previous the separate material, that is the plane concrete and the hollow GFRP profile, and then the prototype (concrete+GFRP) also considering two different way of load application. Particularly we applied in the first case the load to only the core of the sample, on the plane concrete, and then to the total cross section. This choice allows to evaluate the role and the influence of the bond strength along the length of each sample.

Abstract: Concrete slab in the negative moment area of continuous steel-concrete composite beams is prone to crack due to the low tension strength of common concrete, which could result in the decreasing of the strength and durability. To solve this problem, a method of replacing the concrete slab with reactive powder concrete (RPC) slab which is of super high strength, durability, toughness and volume stabilization is presented. According to the constitutive relation and the high tension strength of RPC, the normal section failure mode is defined as the critical crack state, and the calculation formula of ultimate bearing capacity is deduced. Finally, some parameters that influence the ultimate bearing capacity are analyzed, such as the height ratio of RPC slab to whole beam, width ratio of RPC slab to steel beam, and the ratio of reinforcement of RPC slab. Compared with the steel-concrete composite beams, it is indicated that in the precondition of RPC slab unallowable crack in negative moment area, the ultimate bearing capacity of steel-RPC composite beams can still be increased, and the crack resistance, stiffness and durability can all be enhanced greatly.

Abstract: Based on the eccentric loaded simulations of 30 GFRP tube columns filled with reinforced concrete, and comparative analysis with the corresponding experiments, for ultimate load analysis GFRP tube columns filled with reinforced concrete, establish the models of GFRP tube columns filled with reinforced concrete, and prove accuracy of the models.

Abstract: To explore the performance of the flexible nodes between the precast concrete wall panel and the frame structure, a steel truss is used as an analogue of the frame structure to develop a test. In the test, one precast concrete wall panel was installed on the steel truss, and the connection nodes are designed to be able to slip vertically. Different horizontal forces were exerted on the steel truss to form certain drifts, and the deformation of panel and the slipping performance of the connection nodes were explored. It is found that precast concrete wall panel wont deform under the influence of the drifts, while the connection nodes between the frame structure and the panel were found to slip. The results show that the design of slipping connection node has enough reliability.

Abstract: A new type rubber powder particle modifier can be produced by adding some performance improvement additives into normal 40-60 mesh rubber powder, and re-granulation, it mixed well with the base asphalt, having less airborne dust and better performance. Researching the performance indicators of rubber powder particles modified asphalt under different process parameters through the adjustment of shear temperature, shear rate, shear time, and the dosage of rubber powder in the process of producing rubber powder particles modified asphalt, determining the optimal process parameters, and the road performance indicators of the modified asphalt mixture has been verified.

Abstract: A new type of rubber powder particle modifier can be produced by adding some performance improvement additives into the normal 40-60 mesh rubber powder and re-granulation, it proved to have better performances and less airborne dust, mixing well with base asphalt. Researching the performance indicators of rubber powder particles modified asphalt under different process parameters through the adjustment of shear temperature, shear rate, shear time and dosage of rubber powder in the process of producing rubber powder particles modified asphalt, the optimal process parameters was determined, and the road performance indicators of the modified asphalt mixture has been verified.

Abstract: Rubber asphalt and crumb rubber modified asphalt are the internationally recognized best way to disposal of waste tires, harmless treatment and resource utilization. The applications of rubber asphalt and asphalt mixture with scrap tire rubber powder in the highway construction are in the ascendant and the relevant standards are the precondition of the application. In order to fit the needs of the development form, SINOPEC and Research Institute of Highway in the Ministry of Communications put forward their own standards, but with different definitions of waste crumb rubber modified road asphalt and obvious different technical standards, etc. So, in this paper according to the introduction and comparison of these two standards to further standardize the technical index of the scrap tire rubber powder, selection, production process, production process and technical index of rubber asphalt and crumb rubber modified asphalt and the material selection and the design process of mixture; the technical reference and support to the extensive application can be also got.

Abstract: Coal gangue as road engineering material can sovle the problems of energy saving and environmental protection.Experimental datas of grain size distribution,crushing value,slake durability index,expansivity,liquid limit index,plastic limit index and water absorption showed that its own characteristics are in line with the requirements of road engineering materials. There are successful cases of application of coal gangue in road constructions both here and abroad. Principal component analysis is used to identify four major factors of coal gangue applications in road construction.Put forward 5 urgent problems to be solved and give a few corresponding suggestions.

Abstract: CrAlSiN film possesses superior hardness, good thermal and chemical stability due to its multi-component constituents and unique structure. To further explore the reproducibility and scale-up thickness of CrAlSiN coatings, the multi-cycle deposition of CrAlSiN coatings by cathodic arc evaporation was conducted in this study in order to evaluate the effect of coating thickness on the properties of CrAlSiN coated materials. Two targets of Al_0.8Si_0.2 and Cr (99.99 at%) along with altering deposition cycles were used for the coatings. The results showed that the CrAlSiN coatings had an increase in hardness up to 4700 HV_50g confirmed by Vickers hardness tests. Surface roughness of the coatings could be dramatically improved by erosion tests as a result of removing droplets and higher asperities on the coating surface.