This research highlights the effect of sustained service load at elevated temperatures on the residual flexural response of reinforced concrete (RC) T-beams after being exposed to 1292°F (700°C) or 1652°F (900°C) for 3 hours, and then air cooled.
New research is focusing on a model for calculating crack width in the case of cracks caused by progressive cooling of the wall (for example, at the stage of concrete hardening or during ambient temperature changes), the concrete shrinkage, and the subsequent service loads.
The use of recycled concrete aggregate (RCA) in concrete production can lead to a significant reduction in the Modulus of Elasticity (MOE).
A field work study of four bridges in Denver, Colorado was conducted to assess the behavior of prestressed concrete bridges carrying light rail transit loadings.
The geopolymer investigated in this research shows potential as a lightweight coarse aggregate for concrete, with the additional benefit of reducing the environmental impact of fly ash from coal-fired power generation.
A team of researchers, contractors, and state materials engineers concluded that the simple process of casting large diameter drilled shafts with a central void completely eliminated mass concrete conditions that can accompany large concrete structures .
Controlling or limiting the internal relative humidity (moisture) within concrete may prevent deterioration from occurring, or slow ongoing deterioration.
The use of recycled concrete aggregate (RCA) in new concrete production can minimize the environmental impact associated with the construction industry.
The use of discarded/rejected precast concrete represents a significant opportunity as a source for clean recycled concrete aggregates with consistent properties and high quality.
The use of mineral admixtures in concrete produced with treated recycled concrete aggregate enhances both the mechanical and durability properties leading to sustainable development.
The present study addresses the feasibility of reinforced concrete columns totally reinforced with glass fiber-reinforced polymer (GFRP) bars achieving the drift requirements specified in various codes.
Results from a recent study show that a prescriptive code-based approach can lead to critical underestimation of seismic demands.
An experimental study examines the physical characteristics of internally cured concrete using organic and inorganic materials, including chloride-related responses.
The “Engineering Ethics” webinar will review various codes of ethics and their applications, along with a review of some case studies and lessons learned.
The results described in this work show the electrical resistivity measurement method has the potential to be an accurate means for measuring the water absorption of very fine particles. Such advances in characterization methods for fine particles support the broader acceptance of recycled concrete.
An innovative conductive composite, ionically conductive mortar, is developed in this study.
Analysis to evaluate the onset of global instability under tension/compression load shows that the onset of buckling can be identified using either a proposed buckling theory or computer simulations.
Test results show that interactions between admixtures can reduce air-void stability, contributing to lowered freezing-and-thawing durability and scaling resistance.
New research is focusing on the use of deicing salt blends to build concrete roads that are more durable and extend the service life of concrete pavements.
The research outcomes reveal that stress state can markedly affect the ASR performance of concrete by affecting ASR expansion, influencing opening and orientation of ASR cracks, and associating directional effect on the mechanical properties of concrete.
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