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Magazine of Concrete Research

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ISSN: 0024-9831
E-ISSN: 1751-763X

Impact Factor 0.912. 

At a time when energy concerns and sustainability issues are high on international agendas, the role of concrete is paramount.  Concrete’s versatility and global availability make it the world’s first choice in many applications, both onshore, offshore, above and below ground.  It is also unique, being the only cold, mouldable, inorganic plastic that can be used on a significant engineering scale. However, for concrete and other cementitious derivatives to be developed further, we need to understand the use of alternative hydraulically active materials used in combination with plain Portland Cement, sustainability and durability issues.  Both fundamental and best practice issues need to be addressed.

  • - Average time to acceptance: 12 weeks.
  • - Average time to PDF publication: 8 weeks.

Magazine of Concrete Research covers every aspect of concrete manufacture and behaviour from performance and evaluation of constituent materials to mix design, testing, durability, structural analysis and composite construction.

  • - To submit to the journal is free. Papers appear Ahead of Print (below) as soon as they are ready to be published. Ahead of print articles are fully citable using the DOI system.

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  • Non-axis-symmetrical punching shear around internal columns of RC slabs without transverse reinforcement
    Author(s): Juan Sagaseta; Aurelio Muttoni; Miguel Fernández Ruiz; Luca Tassinari
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  • Most analytical approaches and available test data for punching shear in flat slabs assume axis-symmetrical conditions, which seems realistic for representing slabs supported on columns equally spaced in both orthogonal directions. However, in practice, there are many instances where loading, geometry and reinforcement around internal columns differ significantly from ideal axis-symmetrical conditions. Typical examples include slab bridges, flat slabs with unequal spans and footings with unequal widths. This paper presents a series of punching shear tests on slabs without transverse reinforcement and different flexural reinforcement ratios or loading conditions in each orthogonal direction. The tests show that both the type of loading and the amount of flexural reinforcement have a significant influence on the punching shear strength and symmetry of the response. Eurocode 2 and BS 8110 code formulas provided reasonable strength predictions of the tests using the recommended average reinforcement ratio between the x and y directions. A physical explanation behind this assumption is presented, based on critical shear crack theory. A rational analytical approach was developed for non-axis-symmetrical punching, which provides accurate predictions of strength and deformation capacity. The novelty of the proposed method is that it considers a non-uniform shear strength distribution per unit length along the control perimeter, which results in a redistribution of shear near failure.
  • Shear strength prediction for reinforced concrete beams without stirrups
    Author(s): Wei-wei Wei; Yi Che; Jin-xin Gong
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  • Traditionally, shear design of concrete beams without stirrups has relied on empirical equations derived from laboratory experiment data. However, such methods lack a sound theoretical basis for shear failure of reinforced concrete (RC) structures due to the complexity of the failure mechanism. In the 1980s, a relatively rational model based on the modified compression field theory (MCFT) was developed at the University of Toronto and subsequently accepted worldwide; it forms the basis of shear provisions in Canadian standards and American specifications for the design of concrete structures. This paper describes further research based on the MCFT. An expression for the average shear stress across a crack was derived and a simplified equation of shear strength considering the size effect in shear was developed. The obtained equations were verified with extensive sets of experimental data from different sources (598 beams in total). It was found that the variation coefficients of the ratio of shear strength calculated using the derived average shear stress across a crack based on the MCFT and the simplified expressions to the test data was small; the mean was about 0·8. It is thus considered that the simplified expressions are suitable for shear analysis and design of RC beams without stirrups.
  • Bond capacity of severely corroded bars with corroded stirrups
    Author(s): Kamyab Zandi Hanjari; Dario Coronelli; Karin Lundgren
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  • Eccentric pull-out tests were carried out to study the influence of severe corrosion leading to extensive cover cracking, and the effect of corroded and non-corroded stirrups on the anchorage of deformed bars. The specimens were subjected to a low-rate electrochemical corrosion process for three time spans that caused a rebar weight loss up to approximately 20% in the main bars and 35% in the stirrups. Pull-out tests were then carried out in each specimen, on either the two corner bars or the middle bar, to measure the bond capacity. The effects of corrosion and the mechanical testing were simulated with non-linear finite-element analysis. The combination of tests and analyses gives a better understanding of the effect of high corrosion penetrations and the presence of corroded stirrups on failure modes. The presence of stirrups, corroded and non-corroded, was found to significantly change the behaviour of an anchorage region, namely the corrosion-induced crack pattern, the failure mode and the bond capacity.
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  • Biaxial flexural strength of concrete by two different methods
    Author(s): Jihwan Kim; Chongku Yi; Goangseup Zi
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  • The biaxial flexural strength of a concrete panel can be evaluated by two different methods: the centrally loaded round panel test (ASTM C 1150) and the recently proposed biaxial flexure test (BFT). Twenty-six tests, with 13 specimens for each test method, were performed to verify the effect of the different test methods on the biaxial flexural strength of concrete. A finite-element analysis of the specimens of two test methods showed that the biaxial flexure test set-up allows a larger area with a uniform biaxial stress on the bottom surface around the centre of the specimen than the ASTM C 1550 set-up, indicating that the difference in the test results is attributable to the volume effects. The test results showed that the biaxial flexure test method gives a more reliable biaxial flexural strength with a 25% lower coefficient of variation than that from the ASTM C 1550.
  • Strength and toughness properties of steel fibre reinforced concrete under repetitive impact
    Author(s): Zhiliang Wang; Yiqun Tang; Jianguo Wang
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  • This paper investigates the compression strength and the energy absorption of steel fibre reinforced concrete under repetitive impact loadings. Cylindrical concrete specimens are fabricated with 0, 1·5 and 3·0% fibre volume fractions. For each fibre volume fraction, stress–strain curves are measured using split Hopkinson pressure bar tests. Also, post-test photographs are taken for each specimen after each impact. The data collected are used to evaluate the energy absorption and the damage evolution of concrete in compression. The results indicate that damage increases and strength decreases with the increase of impact times. Fibrous concrete is markedly superior to plain concrete in resisting dynamic failure. Furthermore, both impact velocity and fibre volume fraction exert a significant influence on the dynamic response of concrete.
  • Flexural capacity predictions of self-compacting concrete beams using stress–strain relationship in axial compression
    Author(s): R. Kumar; B. Singh; P. Bhargava
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  • Due to its unique composition, self-compacting concrete (SCC) may have stress–strain characteristics that are significantly different from those of conventionally vibrated concrete (CVC). An experimental investigation was carried out to generate complete stress–strain curves for SCC in axial compression by testing 162 standard cylindrical specimens of strength 35–70 MPa. The accuracy of analytical models for CVC selected from the literature in predicting the stress–strain behaviour of the SCC mixtures is discussed and their inadequacies are highlighted. A new constitutive model covering a wide range of concrete strengths is proposed for SCC. The equivalent rectangular stress block specified in current design codes for flexural capacity predictions was developed on the basis of tests on CVC; given the observed differences in the stress–strain behaviour of CVC and SCC, its applicability to structural design of SCC members becomes questionable. On the basis of the proposed constitutive model for SCC, a new equivalent rectangular stress block valid for concrete strengths of up to 70 MPa is presented for analysis of flexural capacity. The flexural capacity predictions of the proposed stress block are compared with experimental data from the present work and other investigations reported in the literature, and good agreement was obtained. A simple analytical approach is presented for predictive assessment of the load–deflection behaviour of SCC beams with a reasonable degree of accuracy.
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