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JournalISSN: 0024-9831

Magazine of Concrete Research 

ICE Publishing
About: Magazine of Concrete Research is an academic journal published by ICE Publishing. The journal publishes majorly in the area(s): Compressive strength & Cement. It has an ISSN identifier of 0024-9831. Over the lifetime, 3112 publications have been published receiving 62855 citations. The journal is also known as: Concrete research.


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Journal ArticleDOI
TL;DR: In this article, the theoretical basis of unsaturated flow theory is reviewed, together with methods of measurement suitable for cement-based materials, and the dependence of the sorptivity on initial water content, temperature and fluid properties is also described.
Abstract: The sorptivity is an easily measured material property which characterizes the tendency of a porous material to absorb and transmit water by capillarity. Its theoretical basis in unsaturated flow theory is reviewed, together with methods of measurement suitable for cement-based materials. Available data on mortars and concretes are included. The dependence of the sorptivity on initial water content, temperature and fluid properties is also described. Other test methods (the initial surface absorption, the Figg water absorption and the Covercrete absorption tests) are discussed in terms of the sorptivity.

712 citations

Journal ArticleDOI
TL;DR: In this paper, a reassessment of the subject is given, which considers material and environmental factors/mechanisms influencing the strength of concrete during the heat cycle and after cooling, not all of which necessarily result in strength loss.
Abstract: Based on experience with siliceous aggregate/OPC paste concrete it is generally believed that the compressive strength of unsealed ‘concrete’ declines sharply above 300°C. This is too pessimistic a view. A reassessment of the subject is given in this Paper, which considers material and environmental factors/mechanisms influencing the strength of concrete during the heat cycle and after cooling, not all of which necessarily result in strength loss. Design of concrete for better performance at high temperatures should aim at minimizing contributions to strength loss, while exploiting the processes responsible for gain in strength. It appears that, in its hydraulic state of binding, a rheological criterion limits the structural usefulness of Portland cement concrete to temperatures of 600°C. Today, many commonly used concretes lose considerable strength at temperatures above about 300°C. There is, therefore, scope for improvement in design within the temperature range 300— 600°C. Raising the ‘working’ temper...

458 citations

Journal ArticleDOI
TL;DR: In this paper, the state of stress in the concrete due to bond forces from deformed reinforcing bars is analyzed and a concrete ring model is used for determination of the cracking resistance of the concrete cover.
Abstract: Synopsis The state of stress in the concrete due to bond forces from deformed reinforcing bars is analysed. For determination of the cracking resistance of the concrete cover, a concrete ring model is used. The stresses are calculated for an elastic stage, a plastic stage, and an elastic stage with internal ring cracks. The appearance of the concrete cover cracks along the deformed bars in the bond zones for normal cover thickness can be determined by using the mean of the values obtained for the two last stages. The partly cracked elastic stage gives cracking loads just on the safe side.

452 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigated the influence of type and diameter of reinforcement on the residual strength of corroded reinforcing bars and found that the residual cross-section of a corroded bar is no longer round and varies considerably along its circumference and its length.
Abstract: This paper presents an experimental investigation into the residual capacity of corroded reinforcing bars. By performing both accelerated and simulated corrosion tests on bare bars and on bars embedded in concrete, the mechanism of the reduction of the capacity of corroded reinforcement was investigated. The influence of type and diameter of reinforcement on its residual capacity is discussed. The experimental results show that, due to local attack penetration, the residual cross-section of a corroded bar is no longer round and varies considerably along its circumference and its length. Although the force–extension curves of corroded bars are similar to those of non-corroded bars for up to 16% corrosion, their residual yield and ultimate forces decrease more rapidly than their average cross-sectional area and, therefore, their residual strength decreases significantly. Even though the residual capacity of corroded small diameter and/or plain bars reduces more than that of large diameter or ribbed ones, di...

448 citations

Journal ArticleDOI
TL;DR: In this paper, a laboratory study of the development of foamed concrete, utilising two types of fly ash, with the potential for use in structural applications, was described, where fine fly ash (i.e. to BS EN 450) was used to partially replace Portland cement and coarse fly ash to replace sand fine aggregate.
Abstract: Low self-weight (800 to 1600 kg/m3), high workability (flowing and self-compacting) and excellent thermal insulating properties ( 25 N/mm2). This paper describes a laboratory study of the development of foamed concrete, utilising two types of fly ash, with the potential for use in structural applications. ‘Fine’ fly ash (i.e. to BS EN 450) was used to partially replace Portland cement and a ‘coarse’ fly ash (i.e. to BS 3892-2) to replace sand fine aggregate. In addition, the potential of polypropylene fibres in foamed concrete to enhance plasticity and tensile strength was examined. The key early age, engineering and durability properties were meas...

375 citations

Performance
Metrics
No. of papers from the Journal in previous years
YearPapers
202343
2022133
2021126
202086
2019110
201863