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Newswise: A New Model for Crack Control in Reinforced Concrete (RC) Tank Walls (Part I and Part II)
2-May-2019 4:00 PM EDT
A New Model for Crack Control in Reinforced Concrete (RC) Tank Walls (Part I and Part II)
American Concrete Institute (ACI)

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.

Newswise: Effect of Sustained Service Loading on Post-Fire Flexural Response of Reinforced Concrete (RC) T-Beams
3-May-2019 9:00 PM EDT
Effect of Sustained Service Loading on Post-Fire Flexural Response of Reinforced Concrete (RC) T-Beams
American Concrete Institute (ACI)

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.

Newswise: Artificial Intelligence to Investigate Properties of Concrete Mixtures Incorporating Recycled Aggregate Concrete
Released: 11-Feb-2019 2:15 PM EST
Artificial Intelligence to Investigate Properties of Concrete Mixtures Incorporating Recycled Aggregate Concrete
American Concrete Institute (ACI)

The use of recycled concrete aggregate (RCA) in concrete production can lead to a significant reduction in the Modulus of Elasticity (MOE).

Newswise: Evaluation of Prestressed Concrete Bridges under Light Rail Loading
20-Dec-2018 2:00 PM EST
Evaluation of Prestressed Concrete Bridges under Light Rail Loading
American Concrete Institute (ACI)

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.

Newswise: Effect of Geopolymer Aggregate on Strength and Microstructure of Concrete
Released: 5-Dec-2018 1:00 PM EST
Effect of Geopolymer Aggregate on Strength and Microstructure of Concrete
American Concrete Institute (ACI)

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.

Newswise: Controlling Mass Concrete Effects in Large Diameter Drilled Shafts Using Full Length Central Void
30-Aug-2018 10:15 AM EDT
Controlling Mass Concrete Effects in Large Diameter Drilled Shafts Using Full Length Central Void
American Concrete Institute (ACI)

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 .

Newswise: Effects of Moisture, Temperature, and Freezing-and-Thawing on Alkali-Silica Reaction
Released: 6-Aug-2018 10:00 AM EDT
Effects of Moisture, Temperature, and Freezing-and-Thawing on Alkali-Silica Reaction
American Concrete Institute (ACI)

Controlling or limiting the internal relative humidity (moisture) within concrete may prevent deterioration from occurring, or slow ongoing deterioration.

Newswise: High-Volume Recycled Materials for Sustainable Transportation Infrastructure
23-May-2018 2:00 PM EDT
High-Volume Recycled Materials for Sustainable Transportation Infrastructure
American Concrete Institute (ACI)

The use of recycled concrete aggregate (RCA) in new concrete production can minimize the environmental impact associated with the construction industry.

Newswise: Service-Load Behavior of Precast/Prestressed Concrete Beams with High-Quality Recycled Concrete Aggregates
3-May-2018 1:30 PM EDT
Service-Load Behavior of Precast/Prestressed Concrete Beams with High-Quality Recycled Concrete Aggregates
American Concrete Institute (ACI)

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.

Newswise: Sustainability of Recycled Concrete Aggregate
29-Mar-2018 9:00 AM EDT
Sustainability of Recycled Concrete Aggregate
American Concrete Institute (ACI)

The use of mineral admixtures in concrete produced with treated recycled concrete aggregate enhances both the mechanical and durability properties leading to sustainable development.

Newswise: Experimental Behavior of GFRP-Reinforced Concrete Columns under Lateral Cyclic Load
Released: 7-Mar-2018 11:00 AM EST
Experimental Behavior of GFRP-Reinforced Concrete Columns under Lateral Cyclic Load
American Concrete Institute (ACI)

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.

Newswise: Seismic Performance of a Building Subjected to Intermediate Seismic Shaking
Released: 1-Mar-2018 2:00 PM EST
Seismic Performance of a Building Subjected to Intermediate Seismic Shaking
American Concrete Institute (ACI)

Results from a recent study show that a prescriptive code-based approach can lead to critical underestimation of seismic demands.

Newswise: Physical Characteristics and Chloride Permeability of Internally Cured Concrete Studied Using Organic and Inorganic Materials
2-Feb-2018 3:00 PM EST
Physical Characteristics and Chloride Permeability of Internally Cured Concrete Studied Using Organic and Inorganic Materials
American Concrete Institute (ACI)

An experimental study examines the physical characteristics of internally cured concrete using organic and inorganic materials, including chloride-related responses.

Released: 15-Jan-2018 12:05 PM EST
American Concrete Institute Announces New Webinar on Engineering Ethics
American Concrete Institute (ACI)

The “Engineering Ethics” webinar will review various codes of ethics and their applications, along with a review of some case studies and lessons learned.

Newswise: Electrical Resistivity Measurement Method for Measuring Water Absorption Characterizes Properties of Recycled Concrete Fine Particles
30-Nov-2017 2:00 PM EST
Electrical Resistivity Measurement Method for Measuring Water Absorption Characterizes Properties of Recycled Concrete Fine Particles
American Concrete Institute (ACI)

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.

Newswise: Tests Identify Onset of Out-of-Plane Buckling for Slender Wall Boundaries Subjected to Earthquake Loading
3-Nov-2017 2:00 PM EDT
Tests Identify Onset of Out-of-Plane Buckling for Slender Wall Boundaries Subjected to Earthquake Loading
American Concrete Institute (ACI)

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.

Newswise: Lack of Compatibility in Admixtures Could Harm Concrete Durability
4-Oct-2017 2:00 PM EDT
Lack of Compatibility in Admixtures Could Harm Concrete Durability
American Concrete Institute (ACI)

Test results show that interactions between admixtures can reduce air-void stability, contributing to lowered freezing-and-thawing durability and scaling resistance.

Newswise: The Effect Of Multiaxial Stresses On The Alkali-Silica Reaction (ASR) Damage Of Concrete
12-Jul-2017 2:00 PM EDT
The Effect Of Multiaxial Stresses On The Alkali-Silica Reaction (ASR) Damage Of Concrete
American Concrete Institute (ACI)

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.

Newswise: Blends of Deicing Salts Can Help Increase Concrete Pavement Service Life
12-Jul-2017 2:00 PM EDT
Blends of Deicing Salts Can Help Increase Concrete Pavement Service Life
American Concrete Institute (ACI)

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.

Newswise: Effect of Internal Curing as Mitigation to Minimize Alkali-Silica Reaction Damage
19-May-2017 10:00 AM EDT
Effect of Internal Curing as Mitigation to Minimize Alkali-Silica Reaction Damage
American Concrete Institute (ACI)

With partial replacement of aggregate, it may be possible to mitigate ASR and associated damage when high cement content and potentially reactive aggregates are used.

Newswise: Effect of Combining Near-Surface-Mounted and U-Wrap Fiber-Reinforced Polymer Strengthening Techniques on Reinforced Concrete Beams
17-May-2017 10:00 AM EDT
Effect of Combining Near-Surface-Mounted and U-Wrap Fiber-Reinforced Polymer Strengthening Techniques on Reinforced Concrete Beams
American Concrete Institute (ACI)

This study shows that combining NSM-FRP flexural strengthening with U-wrap FRP shear strengthening will improve the bond without compromising on the deformability of the beam before failure.

Newswise: Fiber Hybridization Technology for Next Generation Concrete
9-May-2017 3:00 PM EDT
Fiber Hybridization Technology for Next Generation Concrete
American Concrete Institute (ACI)

Recognizing the need for flexibility in future construction, researchers at the University of Toronto have been working towards identifying potential benefits from combining different fibers and developing models to predict their response

Newswise: Distributed Sensing for Shrinkage and Tension Stiffening Measurement
26-Apr-2017 9:00 AM EDT
Distributed Sensing for Shrinkage and Tension Stiffening Measurement
American Concrete Institute (ACI)

This research illustrates the potential value of fiber optic distributed strain sensors for reinforced concrete research and the potential for assessing the performance of new and existing structures.

Newswise: Bond Strength in Multilayer Casting of Self-Consolidating Concrete
26-Apr-2017 9:00 AM EDT
Bond Strength in Multilayer Casting of Self-Consolidating Concrete
American Concrete Institute (ACI)

Research shows the evaluation of structural buildup at rest is essential for quality control and performance of self-consolidating concrete.

Newswise: Sustainable Development - Durability of a Structural Lightweight Concrete with Expanded Glass and Silica Fume
20-Mar-2017 10:00 AM EDT
Sustainable Development - Durability of a Structural Lightweight Concrete with Expanded Glass and Silica Fume
American Concrete Institute (ACI)

As the single most widely used construction material in the world, concrete is of substantial interest in relation to sustainable development. There are many environmental consequences induced by the consumption of raw materials but also interesting opportunities of recycling waste materials that can improve its sustainability.

Newswise: Methodology for Life-Cycle Sustainability Assessment of Building Structures
Released: 3-Mar-2017 9:00 AM EST
Methodology for Life-Cycle Sustainability Assessment of Building Structures
American Concrete Institute (ACI)

The design of new structures, as well as the retrofit strategies of existing buildings, have become the preferential target of contemporary engineers and architects for achieving sustainability goals in the construction industry.

Newswise: American Concrete Institute Releases 2017 Edition of Manual of Concrete Practice
Released: 15-Feb-2017 11:05 AM EST
American Concrete Institute Releases 2017 Edition of Manual of Concrete Practice
American Concrete Institute (ACI)

The American Concrete Institute (ACI) has released the printed and digital editions of one of its 2017 Manual of Concrete Practice.

Newswise: American Concrete Institute Announces New Structural Concrete Specifications
Released: 26-Jul-2016 10:00 AM EDT
American Concrete Institute Announces New Structural Concrete Specifications
American Concrete Institute (ACI)

The American Concrete Institute announces the availability of two important new documents for concrete industry professionals: ACI 301-16 Specifications for Structural Concrete, and the ACI Field Reference Manual. ACI 301-16 complements the completely reorganized ACI 318-14 Building Code Requirements for Structural Concrete

Newswise: Strut Efficiency-Based Design for Concrete Deep Beams Reinforced with FRP Bars
11-Jul-2016 11:00 AM EDT
Strut Efficiency-Based Design for Concrete Deep Beams Reinforced with FRP Bars
American Concrete Institute (ACI)

Concrete deep beams are commonly used when designing transfer girders or bridge bents. These elements are exposed to aggressive environments in northern climates, which causes the steel bars to corrode. Researchers examined the use of fiber-reinforced polymer (FRP) instead of steel as internal reinforcement in deep beams

Newswise: American Concrete Institute Announces New Concrete Repair Code
Released: 16-Jun-2016 9:30 AM EDT
American Concrete Institute Announces New Concrete Repair Code
American Concrete Institute (ACI)

The code requirements represent a major milestone in the industry—not only is it the first material-specific set of requirements for repair materials, but it also serves as ACI’s first code specifically for repairing reinforced concrete.

Newswise: Seismic Response of Fiber-Reinforced Concrete Coupled Walls
Released: 6-May-2016 9:00 AM EDT
Seismic Response of Fiber-Reinforced Concrete Coupled Walls
American Concrete Institute (ACI)

Use of Fiber-Reinforced Concrete in construction will allow for the use of less and simpler steel reinforcement while maintaining good structural behavior and potentially reducing the amount of post-earthquake repair. Such results will lead to a cheaper way to construct safe buildings with reduced life-cycle costs for the owner.

Newswise: Bond of Reinforcement in High-Strength Concrete
Released: 29-Apr-2016 10:00 AM EDT
Bond of Reinforcement in High-Strength Concrete
American Concrete Institute (ACI)

This paper describes an examination of the development of tension lap splices in high strength concrete and the applicability of the restriction in the ACI 318 code where the values of √fc’ used to calculate development length shall not exceed 100 psi.

Newswise: New Computational Modeling Procedure Developed for Estimating Behavior of Reinforced Concrete Members Subjected to Fire
Released: 28-Apr-2016 2:00 PM EDT
New Computational Modeling Procedure Developed for Estimating Behavior of Reinforced Concrete Members Subjected to Fire
American Concrete Institute (ACI)

Fire causes extensive financial losses due to property damage, as well as endangers the life and well-being of occupants. This new study throws light on the behavior of reinforced concrete members subjected to fire.

Newswise: Rapid Repair of Severely Damaged Concrete Columns After an Earthquake
Released: 28-Apr-2016 10:00 AM EDT
Rapid Repair of Severely Damaged Concrete Columns After an Earthquake
American Concrete Institute (ACI)

Repair of damaged bridge columns following an earthquake is a good alternative to replacement. New repair method shows benefits include cost savings, reduction in construction time, and decreased interruption of emergency services.

Newswise: Fiber-Reinforced Bowling Ball Student Competition Winners
Released: 28-Apr-2016 9:00 AM EDT
Fiber-Reinforced Bowling Ball Student Competition Winners
American Concrete Institute (ACI)

Student teams from around the world competed in the recent ACI Fiber-Reinforced Concrete Bowling Ball Competition. During this event, students were challenged to design and construct a fiber-reinforced concrete bowling ball that achieves optimal performance for specified tests and tasks, and document and present the team’s work to an audience of industry professionals.

Newswise: Innovative Mixtures Can Reduce Life Cycle Costs in Concrete Pavement Repair
Released: 27-Apr-2016 9:05 AM EDT
Innovative Mixtures Can Reduce Life Cycle Costs in Concrete Pavement Repair
American Concrete Institute (ACI)

New concrete pavement repair research shows that using nanomaterials can improve long-term performance and durability, and reduce life-cycle costs.

Newswise: Applicability of Using Waste Rubber in Structural Applications
11-Mar-2016 9:00 AM EST
Applicability of Using Waste Rubber in Structural Applications
American Concrete Institute (ACI)

Research shows that utilizing recycled rubber derived from scrap vehicle tires can significantly contribute to the development of semi-lightweight and lightweight concrete.

Newswise: Earthquake Research in New Zealand on Damaged Buildings
26-Feb-2016 11:00 AM EST
Earthquake Research in New Zealand on Damaged Buildings
American Concrete Institute (ACI)

University of Auckland researchers test frame components from a 20-story building damaged during the 2010-2011 Canterbury earthquakes to help engineers improve earthquake design and assessment guidelines

Newswise: Cyclic Lateral Testing of Precast Concrete T-Walls in Fast Low-Rise Construction
13-Jan-2016 8:00 AM EST
Cyclic Lateral Testing of Precast Concrete T-Walls in Fast Low-Rise Construction
American Concrete Institute (ACI)

An innovative precast concrete (PC) T-wall panel system was developed to enhance constructability and lateral load resistance of fast-track, low-rise buildings.

Newswise: Study on the Influence of Column Size and Slab Slenderness on Punching Strength
12-Jan-2016 9:00 AM EST
Study on the Influence of Column Size and Slab Slenderness on Punching Strength
American Concrete Institute (ACI)

This study shows that slenderness has an important influence on the punching strength of slabs with shear reinforcement, despite the fact that it is neglected in many codes of practice.

Newswise: Measured Load Capacity of Buried Reinforced Concrete Pipes
12-Jan-2016 8:00 AM EST
Measured Load Capacity of Buried Reinforced Concrete Pipes
American Concrete Institute (ACI)

New concrete research indicates that critical crack does not develop until after the specified service load has been surpassed, suggesting that current pipe designs are overly conservative.

Newswise:Video Embedded 2015-aci-excellence-in-concrete-construction-award-winners
VIDEO
Released: 1-Dec-2015 1:05 PM EST
2015 ACI Excellence In Concrete Construction Award Winners
American Concrete Institute (ACI)

The ACI Excellence in Concrete Construction Awards provides a platform to recognize concrete projects at the forefront of innovation and technology, and showcases these projects to inspire excellence in concrete design and construction around the world.

Newswise: Protecting the Environment From the Harmful Effects of Natural Sand Mining
20-Nov-2015 9:30 AM EST
Protecting the Environment From the Harmful Effects of Natural Sand Mining
American Concrete Institute (ACI)

Due to the environmental effects of natural sand mining, the regulations discourage the use of natural sand for concrete manufacture. Research shows using crushed sand in self-consolidating concrete is a viable alternative.

Newswise: Sustainable and Safe Concrete Structures? Testing the Seismic Behavior of Full-Scale Recycled Concrete Structures
19-Nov-2015 1:00 PM EST
Sustainable and Safe Concrete Structures? Testing the Seismic Behavior of Full-Scale Recycled Concrete Structures
American Concrete Institute (ACI)

Recently, the first full-scale experiments on recycled concrete structures were made and one of the tests was rather ambitious: the structures were subjected to horizontal forces until they collapsed in order to evaluate their seismic capacity.

Newswise: How Ductility of Concrete Can Influence the Structural Performance of Corroded Reinforced Beams
19-Nov-2015 4:30 PM EST
How Ductility of Concrete Can Influence the Structural Performance of Corroded Reinforced Beams
American Concrete Institute (ACI)

Research on reinforced Engineered Cementitious Composites shows that they can improve infrastructure sustainability by reducing the amount of repair and maintenance needed during the service life.

Newswise: American Concrete Institute Announces Winners of Inaugural Excellence in Concrete Construction Awards
Released: 20-Nov-2015 9:05 AM EST
American Concrete Institute Announces Winners of Inaugural Excellence in Concrete Construction Awards
American Concrete Institute (ACI)

The American Concrete Institute (ACI) announced the winners of the 2015 Excellence in Concrete Construction Awards, who were honored during the ACI Awards Gala at the Concrete Convention & Exposition, November 9, 2015 in Denver, CO.

Newswise: Aging Infrastructure Requires a Better Understanding of the Long-Term Behavior of Bridge Girders
17-Sep-2015 8:00 AM EDT
Aging Infrastructure Requires a Better Understanding of the Long-Term Behavior of Bridge Girders
American Concrete Institute (ACI)

Long-term durability is a major issue for today’s infrastructure. In order to create concrete bridges with longer service lives and better performance, we must better understand the long-term behavior of these members.

Newswise: Building with Recycled Concrete
24-Aug-2015 8:00 AM EDT
Building with Recycled Concrete
American Concrete Institute (ACI)

Farmington Hills, MI - Every day we are impacted by recycled materials. We dry our hands with recycled paper towels, drink our coffee from recycled paper cups, and even drink our water from recycled plastic bottles. But what about building materials?

Newswise: Concrete Cracks Heal Themselves
15-Jun-2015 8:05 AM EDT
Concrete Cracks Heal Themselves
American Concrete Institute (ACI)

In the human body, small wounds are easily treated by the body itself, requiring no further care. For bigger wounds to be healed, the body may need outside assistance. Concrete is like a living body, in that it can self-heal its own small wounds (cracks) as an intrinsic characteristic.


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