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RISUltrasonic Shear Wave Reflection Method for Direct Determination of Porosity and Shear Modulus in Early-Age Cement Paste and Mortar
Publisher: American Society of Civil Engineers
Abstract: An ultrasonic technique for measuring reflection of horizontally polarized shear (SH) waves at different angles of incidence from early-age hydrating mortar and cement paste is described. Measurements from mortar with ...
Behavior of Short Reinforced Concrete Column Elements with Buckling-Resistant Antispring-Clad Reinforcing Bars (BRASR) under Axial Compression
Publisher: ASCE
Abstract: In this study, the buckling-resistant antispring-clad reinforcing bar (BRASR) for improving the performance of the longitudinal reinforcing bars embedded in concrete columns is presented. BRASR is formed using a set of ...
Blast Furnace Slag Hydration in an Alkaline Medium: Influence of Sodium Content and Sodium Hydroxide Molarity
Publisher: ASCE
Abstract: The reaction of blast furnace slag in sodium hydroxide (NaOH) solutions of different molarities is evaluated. The compressive strength of the activated slag does not scale with the molarity of NaOH. The primary reaction ...
High-Temperature Performance of Low-Calcium Fly Ash–Based Geopolymers
Publisher: ASCE
Abstract: The high-temperature behavior of alkali-activated fly ash (AAF) geopolymers is evaluated. The physical and phase changes in the material are determined to be a function of temperature of exposure. Thermal diffusivity and ...
Influence of Process Variables on Shrinkage in Low-Calcium Fly-Ash Geopolymers
Publisher: American Society of Civil Engineers
Abstract: The influence of process variables such as curing temperature and relative humidity (RH) on the shrinkage of alkali-activated fly ash (AAF) is examined in this work. The ambient conditions are varied after an initial ...
Fracture in 3D-Printed Concrete Beams: Deflection and Penetration of Impinging Cracks at Layer Interfaces
Publisher: American Society of Civil Engineers
Abstract: Structural assemblies produced using three-dimensional (3D) concrete printing consist of multiple layers of extruded material deposited along precise trajectories. The stress response of the printed assembly relies on the ...
Fly Ash–Based Aqueous Nanosilica Enhanced Activator for Efficient Production of Room Temperature–Cured Concrete with Two-Part Alkali-Activated Binders
Publisher: American Society of Civil Engineers
Abstract: Room temperature–cured alkali-activated binders of enhanced strength are produced without external silica addition. The extraction of nanosilica and its use in producing alkali-activated binders made of fly ash and slag ...
Quantitative XRD Analysis of Binary Blends of Siliceous Fly Ash and Hydrated Cement
Publisher: American Society of Civil Engineers
Abstract: Quantitative analysis of the amorphous phase in binary blends of siliceous fly ash and hydrated cement is presented using the Partial Or No Known Crystal Structure (PONKCS) method. In binary blends, the total amorphous ...
Quantitative XRD Analysis of Binary Blends of Siliceous Fly Ash and Hydrated Cement
Publisher: American Society of Civil Engineers
Abstract: Quantitative analysis of the amorphous phase in binary blends of siliceous fly ash and hydrated cement is presented using the Partial Or No Known Crystal Structure (PONKCS) method. In binary blends, the total amorphous ...
One-Dimensional Numerical Framework for Shock Compaction of Cellular Foams
Publisher: American Society of Civil Engineers
Abstract: A one-dimensional (1D) finite-volume implementation, based on the second-order Godunov method for predicting dynamic response of foams that exhibit irreversible compaction, is presented. Cellular foams, with an upward ...