Research On Mechanical Properties Of New Foam Concrete Lightweight Precast Wall Panels And Its External Embedded Nodes

The new foam concrete in this research is made of high-temperature steam curing of concrete by a certain proportion of the way through the base to stimulate efficient foam, which is take full advantage of fly ash, sludge ceramsite and blowing agent. The sludge ceramsite and high porosity of ceramic foam slurry in foam concrete greatly reduces the weight, with a density of 600kg/m3. At the same time this characters are also improving self-insulation properties of the foam concrete, whose thermal conductivity coefficient 0.14 ~ 0.15 W /(m·k). As a precast external panel, it is stuck with high strength of decorative veneer wall insulation, highly modularity n, convenient construction, efficient installation, with good economic benefits and technical prospects. Based on this background, mechanical properties of foam concrete precast external wall were studied in this dissertation.This dissertation focuses on this new material, the basic mechanical properties of foam concrete, mechanical properties of the precast external wallpanels and mechanical properties of the embedded nodes, making comparisons of the experimental data and doing the theoretical analysis. The following works are completed:(1) Conducted a study on the basic mechanical properties of a new type of foam concrete, conveying its compressive strength, splitting tensile strength, elastic modulus of static pressure, the bonding mechanical properties between anti-rust coating bars and the new foam concrete. Comparison and analysis of the mechanical properties of the new foam concrete between the two proportions of mixture are made. The results showed that the basic mechanical properties of the new foam concrete is excellent, which can meet the limits of the codes and the engineering requirements.(2) The experimental study on mechanical properties of the precast external wall panels with the two proportions of mixture including the flexural capacity tests, impact tests, hanging capacity test. The results make the comparison of panels in two proportions of mixture and do the analysis the mechanism of the panels. The results of the two proportions of mixture are hardly different. The test results are all beyond the limits of the GB/T 23451-2009 Light weight panels for partition wall used in buildings. It illustrates excellent mechanical properties of the panels, and design results are of partial safety.(3) The experimental research of mechanical properties of embedded nodes is made through monotonic loading test. Flexural capacity tests for the panels of different forms with different embedded nodes are conveyed as well as shear capacity tests. The dissertation analyses the node energy consumption and node failure modes and makes the conclusion of the ultimate capacity of each embedded node.(4) In accordance with the experimental data for the precast external wall panels, theoretical analysis derived formulas for flexural reinforcement formulas in normal section, checking formulas of shear capacity in inclined section, and the deflection of the precast external wall panels. Calculated values which based on the above formulas and measured values are closed to each other. Consequently, the formula can be applied to engineering requirement. At last, the dissertation recommendates the design value of the embeded nodes strength, this dissertation suggests with an economic benefits of view, that P2 is supposed to be the embeded node of new foam concrete precast external walls panels.At last, the main results of this paper are concluded, and put forward the research directions that need to further study.