School of Engineering Department of Civil and Environmental Engineering 90 A Cement-Free Novel Concrete That Absorbs Greenhouse Gas CO2 to Heal Itself and Improve Its Mechanical Performance Supervisor: QIU Jishen / CIVL Student: PARMAN Daniel / MECH Course: UROP 1100, Summer Ordinary Portland Cement (OPC) is the most common cement that has been used for many of humanity’s infrastructure. It has a self-healing property due to 2 mechanisms: continuous hydration of cement grains and carbonation of portlandite, a key component of hydrated Portland cement. During this healing process, surrounding CO2 and H2O is absorbed to seal the small cracks (up to 0.3mm) by reacting with Ca(OH)2 and unhydrated cement respectfully which can recover the frictional bond at the fibre-matrix interface, resulting in the cement regaining its tensile performance. This experiment aims to quantify the values that are used to predict the mechanical properties of the self-healed OPC by analysing the data gathered from pulling out PVA and Sisal fibres out of OPC cement. A Cement-Free Novel Concrete That Absorbs Greenhouse Gas CO2 to Heal Itself and Improve Its Mechanical Performance Supervisor: QIU Jishen / CIVL Student: ZHENG Yiqi / CIEV Course: UROP 1100, Summer This progress report offers a comprehensive comparison between Polyvinyl Alcohol Fiber-Reinforced Ordinary Portland Cement (PVA-OPC) and Sisal Fiber-Reinforced Ordinary Portland Cement (Sisal-OPC) adhesives through pristine, healed, and preloaded & healed single-fiber pullout tests. These two material systems show distinct mechanical behaviors, with sisal fibers displaying distinctive interfacial characteristics in OPC matrices. The study specifies baseline performance metrics for comparison with reactive MgO-based (RMC) composites shortly. Current findings guide the development of improved fiber-reinforced cementitious materials for use during sustainable construction. Recyclable Hydrogel-Based Brick for Construction on Mars: a Feasibility Study Supervisor: QIU Jishen / CIVL Co-Supervisor: XUE Tianju / CIVL Student: YAU Long Kit / CIVL Course: UROP 4100, Fall After the introduction of finite element method (FEM) done last term, it is apparent that FEM is a crucial tool for approximating solutions to complex physical phenomena described by partial differential equations. This report implements a finite element analysis (FEA) for a simply supported beam subjected to a uniform load with Python, aimed at evaluating the beam's deflection along its length. It systematically divides the beam into finite elements, constructing a global stiffness matrix based on material properties, geometry, and the applied load. The analysis incorporates boundary conditions by modifying the stiffness matrix and force vector to account for fixed support at one end.
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