Experimental Study for Structural Behaviour of Precast Lightweight Panel (PLP) Under Flexural Load
Precast lightweight concrete slab is first fabricated in workshop or industrial before construction and then transported to site and installed by skilled labour. It can reduce construction time by minimizing user delay and time for cast-in-situ to increase workability and efficiency. is environmental friendly and helps in resource reduction. Although the foamed concrete has low compressive strength compared to normal weight concrete but it has excellent thermal insulation and sound absorption. It is environmental friendly and helps in resource reduction. To determine the material properties of foamed concrete, nine cubes and six cylindrical specimens were fabricated and the results were recorded. In this study, structural behaviour of precast lightweight panel (PLP) with dry density of 1800 kg/m3 was tested under flexural load. The results were recorded and analysed in terms of ultimate load, crack pattern, load-deflection profiles and strain distribution. Linear Voltage Displacement Transducers (LVDT) and strain gauges were used to determine the deflection and strain distribution of PLP. The theoretical and experimental ultimate load of PLP was analysed and recorded to be 70 and 62 kN respectively, having a difference of 12.9%. Based on the results, it can be observed that PLP can resist the adequate loading. Thus, it can be used in precast industry for construction purposes.
COMPRESSION TEST AND FINITE ELEMENT ANALYSIS OF FOAMED CONCRETE CUBE
Foamed concrete is one of the most economical and industrialized construction materials in modern building construction market either for conventional construction technique or precast construction technique. However, the damage behavior of foamed concrete had not been explored deeply by researchers especially for its continuum damage mechanics and plasticity. This paper presents the results of compressive tests and finite element analysis of foamed concrete cubes. The focus of this paper is on the compressive behavior of foamed concrete. Three dimensional- nonlinear finite element model was developed and analyzed by the aquasi static technique using the ABAQUS explicit module. The input parameters of the model were obtained from experimental results. Concrete damaged plasticity was chosen as damaged criteria. Results show that the proposed finite element model is able to predict the damage behavior of the foamed concrete cube accurately. Thus, finite element method can be used as an economical tool for studying the structural behavior of foamed concrete in compression.
Fully Integrated Bidirectional CMOS-MEMS Flow Sensor With Low Power Pulse Operation
Leveraging More-than-Moore technology, we demonstrate an integrated CMOS MEMS flow sensor via a very compact system on chip (SoC) that can sense the bidirectional N2 gas flow. Our SoC features a very low-noise instrumentation amplifier that is implemented on a CMOS wafer and serves as a readout integrated circuit for a thermoresistive micro-calorimetric flow sensor which is fabricated on a MEMS wafer. A compact heterogeneous integration is achieved by combining the two wafers via the proprietary InvenSense AlN process. The measured sensitivity of our CMOS MEMS flow sensor is 98 mV/sccm which is three times better than the state-of-the-art counterpart. The flow range measured by our SoC is from −26 to 26 m/s (from −50 to 50 sccm). Moreover, the pulsed heater operation makes this proposed SoC flow sensor a very low power (<9 mW) and, thus, a promising candidate for the Internet-of-Things applications in smart home/green buildings.