Effects of the fineness of densified silica fume on the hydration of Portland cement

As one of the mineral admixtures, silica fume (SF) with high pozzolanic reactivity is generally used to improve the properties of concrete. Most commercial silica fume used in concrete project is dry densified silica fume (DSF). It consists of a good deal of agglomerates of sizes ranging from 10 μm to several millimeters. The size of the...

A study on fracture toughness of ultra-high toughness geopolymer composites based on double-K criterion

Ultra-high toughness geopolymer composites (UHTGC) were fabricated based on the matrix of binder composed of alkali-activated fly-ash and granulated blast furnace slag and polyvinyl alcohol (PVA) fibres in this research. The tensile behaviour and fracture toughness of UHTGC are investigated on both macro and microscales experimentally and...

Dynamic Modeling of a Rotating Insect Wing

A dynamic model of an insect wing is developed treating the wing as a deformable body subject to three-dimensional finite rotation about a fixed point at the base of the wing. Discretization of a stationary wing is conducted via finite element analysis to determine the natural frequencies and mode shapes of the wing. By formulating and...

Oxidation induced crack healing of CR2(AL,SI)C MAX phase ceramic

The oxidation crack healing of Cr2AlC and Cr2(Al,Si)C was studied and compared with known healing of Ti2AlC. The oxidation induced crack healing of Ti2AlC is relatively fast and leads to full strength recovery, but the oxidation product contains besides ?-Al2O3 also undesired TiO2. However, when oxidizing Cr2AlC only ?-Al2O3 is formed, but full...

Bim-based pre-occupancy evaluation method for supporting the designer-client communication in design stage

This paper introduces a BIM based user pre-occupancy evaluation method (UPOEM), which is applied in architectural design stage for the aim to improve the efficiency and effectiveness of the communication between designers and clients. There are constants interactions between the clients’ requirements and designers’ solutions during the early...

A simple momentum forcing method on unstructured Cartesian mesh for immersed bodies in incompressiblle flows

The incompressible Navier-Stokes equations are solved by an implicit pressure correction method on unstructured Cartesian meshes. A simple immersed boundary method is developed to treat arbitrary solid bodies in the flow field. A direct momentum forcing term was added to cells inside the immersed body to enforce the no-slip boundary condition....