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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 391 Abstracts search results
Document:
SP365_05
Date:
March 1, 2025
Author(s):
David Z. Yankelevsky, Yuri S. Karinski, and Vladimir R. Feldgun
Publication:
Symposium Papers
Volume:
365
Abstract:
Punching shear failure of RC flat slab connections cause loss of slab’s supports. The detached slab is falling and impacting the slab below. That problem requires thorough investigation and appropriate design guidelines. This paper presents research results on various aspects of this impact scenario. The analysis is based on an advanced numerical model that has been formulated, and the impact analyses follow the damage evolution in the concrete and reinforcement until complete connections failure of the impacted slab is developed, and a progressive collapse scenario starts. The effects of slab geometry and material properties were examined, and the contribution of special shear reinforcement and integrity rebars were investigated. The potential contribution of added drop panels to enhance slab resistance were examined. The slabs impact effect on the supporting columns has been investigated as well. The suitability of current static loading design-criteria to provide safe design against dynamic/impact punching shear is assessed. It shows that the current static-loading based design standards cannot ensure resilience of flat slab connections to impact loading and therefore cannot prevent a progressive collapse scenario. Analyses results are compared with inspected failure details of a collapsed RC flat slabs parking garage building, and excellent agreement is obtained.
DOI:
10.14359/51746685
CI4703NEUnews
Concrete International
47
Issue:
3
NEU: An ACI Center of Excellence for Carbon Neutral Concrete introduced its new third-party Validation/Verification Program for the cement and concrete industries. NEU’s Program provides third party validation or verification of the environmental claims of both existing and innovative new products and technologies associated with reduced carbon cement, concrete production, and concrete products following International Organization for Standardization (ISO) standards.
CI4611Tepke
November 1, 2024
David G. Tepke and Stephen S. Szoke
46
11
This article discusses development of code requirements from an idea into an application and then to refinement toward industry advancement. It provides an overview of the process, including common scenarios related to the development of new and modification of existing industry standards.
CI4609neuNews
September 1, 2024
9
Dean Frank, Executive Director of NEU: An ACI Center of Excellence for Carbon Neutral Concrete, participated in the National Institute of Standards and Technology (NIST) Low Carbon Cements and Concretes Consortium second annual in-person meeting in Frederick, MD, USA. Frank also attended the White House Office of Science and Technology Policy (OSTP) Concrete Innovation Summit at the Eisenhower Executive Office Building on the White House grounds.
SP-362_59
June 17, 2024
Bernadin Guillaume, Théodore Serbource, Sandrine Gauffinet, Marie-Noëlle de Noirfontaine, and Laurent Izoret
362
Due to the drastic necessity to reduce cement and binder carbon footprint and because of the increasing scarcity of traditional supplementary cementitious material, there is an increasing interest in non-traditional reactive materials with low CO2 footprint, eventually coming from the circular economy. There are several emerging opportunities that need to be investigated before confirming their aptitude to substitute clinker, alone or in combination with other materials. Among these opportunities, reclaimed fired clay roof tiles and bricks represent a good candidate not only because they were historically used by the antic Romans but also because they represent a significant part of demolition wastes. These materials, gathered from different locations in France with different ages, were chemically and mineralogically characterized. Their potential pozzolanic character was assessed by mean of R3 tests with a follow-up of the evolution of hydrates suite (consumption and precipitation), doubled with mechanical strength on mortar for different formulated binders, combining materials to simulate standardized cement types according to European standards EN197-1 and -5. The overall results indicate their reactivity was good enough to conclude that these materials can be considered as potential alternative SCMs.
Due to the drastic necessity to reduce cement and binder carbon footprint and because of the increasing scarcity of traditional supplementary cementitious material, there is an increasing interest in non-traditional reactive materials with low CO2 footprint, eventually coming from the circular economy.
There are several emerging opportunities that need to be investigated before confirming their aptitude to substitute clinker, alone or in combination with other materials. Among these opportunities, reclaimed fired clay roof tiles and bricks represent a good candidate not only because they were historically used by the antic Romans but also because they represent a significant part of demolition wastes.
These materials, gathered from different locations in France with different ages, were chemically and mineralogically characterized. Their potential pozzolanic character was assessed by mean of R3 tests with a follow-up of the evolution of hydrates suite (consumption and precipitation), doubled with mechanical strength on mortar for different formulated binders, combining materials to simulate standardized cement types according to European standards EN197-1 and -5. The overall results indicate their reactivity was good enough to conclude that these materials can be considered as potential alternative SCMs.
10.14359/51742009
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