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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-5 of 9 Abstracts search results
Document:
108-S09
Date:
January 1, 2011
Author(s):
C. Kerem Gulec and Andrew S. Whittaker
Publication:
Structural Journal
Volume:
108
Issue:
1
Abstract:
Low aspect ratio reinforced concrete walls are important structural components in many commercial buildings and nearly all safety-related nuclear structures. The accurate prediction of their shear strength is important for both code-based design and seismic performance assessment. Building codes, manuals of practice, standards and guidelines, and the literature provide a number of empirical equations for peak shear strength of reinforced concrete walls. These equations vary substantially in functional form and do not account for all variables that affect the response of low aspect ratio walls. There is substantial scatter in the predicted values of peak shear strength. Improved empirical equations are developed using data from tests of 227 walls with the objective of predicting the peak shear strength of low aspect ratio walls without bias and with a small coefficient of variation (COV).
DOI:
10.14359/51664205
95-M34
July 1, 1998
Paul J. Uno
Materials Journal
95
4
Freshly placed concrete exposed to hot, windy conditions often is prone to plastic shrinkage cracking (though other conditions can also promote this phenomenon). This type of cracking is normally noticed on slabs, pavements, beams, and other flat concrete surfaces. Many factors affect plastic shrinkage cracking, in particular the evaporation of water from the surface of freshly placed concrete. Other factors also influence the likelihood of plastic shrinkage cracking such as water-cement ratio, fines content, member size, admixtures, and on site building practices. Evaporation itself is a function of climatic variables such as relative humidity, air temperature, the temperature of the evaporating surface, and, very importantly, the wind velocity at the surface. This paper primarily explains the background to the evaporation nomograph found in ACI 305R-96 "Hot Weather Concreting," Manual of Concrete Practice, Part 2-1996, in which the graph provides a means of estimating the rate of evaporation of surface moisture from concrete. The paper offers an alternative nomograph and various formulae to predict an evaporation rate of surface water (primarily bleed water) from freshly placed concrete surfaces. Other factors related to evaporation and plastic shrinkage cracking also are addressed.
10.14359/379
JL64-22
May 1, 1967
ACI Committee 315
Journal Proceedings
64
5
ACI Committee 315 is charged with the mission of maintaining and keeping current the ACI Detailing Manual. Since the adoption of the current Manual in 1965, the rapid growth in usage of high strength reinforcing bars and ultimate strength design makes necessary certain modifications of practice in column tie details and standard hooks. Pend-ing proposal of a complete revision to the Manual, the results of the committee studies in these areas are presented as interim recommendations for good practice. Discussion of these interim recommendations is particularly invited to provide a complete record of experiences in their use.
10.14359/7559
JL62-62
September 1, 1965
A. Murray Lount
62
9
The computer is becoming the focal point of a complete revolution in the approach to engineering problems. However, the best use of this new tool is not made under existing engineering office organization and as a mere replacement for manual labor. Proper use of computers depends on knowing what they can and cannot do. This paper examines five areas where computers have been, or can be, used with success. The problems of analysis and design, routine operations such as detailing, research, tabular data, and optimization and probability analysis are discussed. Some examples of work where computers were used are presented. It is concluded that the use of computers may lead to a complete reassessment of many aspects of concrete design and practice and it is suggested that the time for some of this may be now.
10.14359/7737
JL61-58
September 1, 1964
61
This manual presents recommended methods and standards for preparing drawings for the fabrication and placing of reinforcing steel in reinforced concrete structures. The manual is up-dated to conform to design concepts electronic computer detailing, prestressed concrete, precast concrete, special large reinforcing bars, high yield point reinforcement, deformed welded wire fabric, and welded or of the new ACI Building Code (ACI 31863) including tor-mechanical butt splices. sion reinforcing, staggered column splices, simplified column tie layouts, all lap splices, closer tolerances in placing rein. forcement, and simplified hook splices. New developments in materials and methods of construction recognized include
10.14359/7821
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