Showing papers in "Magazine of Concrete Research in 2021"
TL;DR: In this paper, it is postulated that the interconnected porosity may cause a serious reduction in strength, and it is assumed that porosity is correlated with high water permeability.
Abstract: Pervious concrete needs to have many pores to achieve high water permeability, but excessive porosity may cause a serious reduction in strength. Herein, it is postulated that the interconnected por...
67 citations
TL;DR: In this paper, a hard-pulse one-dimensional frequency coding sequence of low-field nuclear magnetic resonance (LF-NMR) imaging was applied to concrete durability.
Abstract: Moisture transport has a great impact on concrete durability. In this study, a hard-pulse one-dimensional frequency coding sequence of low-field nuclear magnetic resonance (LF-NMR) imaging was appl...
58 citations
TL;DR: In this article, basalt fiber is used in the field of construction materials due to its low production cost and enhanced mechanical properties, however, research is still needed into the use of basalt fibre for building materials.
Abstract: Nowadays, basalt fibre is gaining popularity in the field of construction materials due to its low production cost and enhanced mechanical properties. However, research is still needed into the use...
32 citations
TL;DR: By electrostatic repulsion and steric hindrance, polycarboxylate-based superplasticiser (SP) decreases the water demand for cement hydration in mortar/concrete production as discussed by the authors.
Abstract: By electrostatic repulsion and steric hindrance, polycarboxylate-based superplasticiser (SP) decreases the water demand for cement hydration in mortar/concrete production. Subsequently, less water ...
29 citations
TL;DR: In this article, a multi-scale framework is proposed to predict the effective properties of ultra-high performance concrete (UHPC) with diff diff diff... through upscaling from hydration products to a macroscopic composite.
Abstract: Through upscaling from the hydration products to a macroscopic composite, a multi-scale framework is proposed to predict the effective properties of ultra-high-performance concrete (UHPC) with diff...
27 citations
TL;DR: In this paper, a model for the natural frequencies of reinforced-concrete (RC) beams with one or more cracks is presented. But this model assumes that cracks occur in a fixed number of cracks.
Abstract: Cracking is a common form of damage in reinforced-concrete (RC) beams. Cracks affect the frequency and deflection of RC beams. Although a model for the natural frequencies of RC beams with one or t...
26 citations
TL;DR: Structural health monitoring (SHM) of civil engineering structures has been widely developed to increase safety and to provide cost-effective maintenance programs as discussed by the authors, however, the current approaches are limited in their applicability.
Abstract: Structural health monitoring (SHM) of civil engineering structures has been widely developed to increase safety and to provide cost-effective maintenance programmes. Although the current approaches...
25 citations
TL;DR: In this paper, the authors studied the flexural behaviour and ductility ratio of reinforced concrete beams made with steel fibres and coarse recycled aggregates (RAs) and strengthened after failure.
Abstract: This paper studies the flexural behaviour and ductility ratio of reinforced concrete beams made with steel fibres and coarse recycled aggregates (RAs) and strengthened after failure. Eight reinforc...
21 citations
TL;DR: In this article, the post-punching performance of reinforced concrete flat plate joints under large deformations has been investigated and shown to be significantly influenced by the post punching performance of their slab-column joints.
Abstract: Progressive collapse of reinforced concrete flat plate systems can be significantly influenced by the post-punching performance of their slab–column joints under large deformations. This work prese...
17 citations
TL;DR: Cemented paste backfill (CPB), a soft concrete-like material, is extensively used in underground mines worldwide for ground support and/or mine waste disposal.
Abstract: Cemented paste backfill (CPB), a soft concrete-like material, is extensively used in underground mines worldwide for ground support and/or mine waste disposal. One of the most important ingredients...
15 citations
TL;DR: In this article, the authors investigated the mechanical strength, porosity and permeability of pervious concrete modified with fiberglass fiberglass and found that the porosity, strength, and porosity of the pervious material was significantly increased with the amount of fiberglass.
Abstract: Pervious concrete has been widely used in parking lots and other lightweight streets. This paper investigates the mechanical strength, porosity and permeability of pervious concrete modified with f...
TL;DR: In this paper, the shear behaviour of large-scale engineered cementitious composite (ECC) beams reinforced with different types of fiber was evaluated. Four types of fibre were used: 8 and 12 mm long polyvinyl al...
Abstract: The shear behaviour of large-scale engineered cementitious composite (ECC) beams reinforced with different types of fibre was evaluated. Four types of fibre were used: 8 and 12 mm long polyvinyl al...
TL;DR: In this article, a better understanding of the rheological behavior of the concrete material used for digital fabrication of concrete elements is presented. Fresh concrete is known to be a thixotropic material having...
Abstract: Digital fabrication of concrete elements requires a better understanding of the rheological behaviour of the cementitious material used. Fresh concrete is known to be a thixotropic material having ...
TL;DR: In this article, the punching and post-punching shear behaviors of reinforced concrete (RC) flat plate structures are studied by using a representative slab-column connection isolated from the parent structure.
Abstract: The punching and post-punching shear behaviours of reinforced concrete (RC) flat plate structures are often studied by using a representative slab–column connection isolated from the parent structu...
TL;DR: In this paper, the effect of temperature on the chloride binding capacity (CBC) of cementitious materials was investigated using a reactive transport model including thermodynamic equilibrium, kinetic control and surf...
Abstract: The effect of temperature on the chloride binding capacity (CBC) of cementitious materials was investigated. A reactive transport model including thermodynamic equilibrium, kinetic control and surf...
TL;DR: In this paper, the shrinkage cracking in concrete is mainly a physical process, in which chemical reactions between cement and water do not play a decisive role, and it is commonly believed that rapid and excessi...
Abstract: Plastic shrinkage cracking in concrete is mainly a physical process, in which chemical reactions between cement and water do not play a decisive role. It is commonly believed that rapid and excessi...
TL;DR: In this paper, different macro-models have been proposed for simulating the behaviour of concrete shear walls because of their significant role in the seismic performance of urban buildings, and different macro models have been evaluated.
Abstract: In recent decades, different macro-models have been proposed for simulating the behaviour of concrete shear walls because of their significant role in the seismic performance of urban buildings. Th...
TL;DR: Calcined clays represent a promising supplementary cementitious material (SCM) to face the growing demand for binders and to compensate for the decreasing availability of established SCMs worldwide.
Abstract: Calcined clays represent a promising supplementary cementitious material (SCM) to face the growing demand for binders and to compensate for the decreasing availability of established SCMs worldwide...
TL;DR: The microstructure and transport properties of mortars made with graphene oxide (GO) and cement and with similar consistency were experimentally investigated and compared with those of control mortars.
Abstract: The microstructure and transport properties of mortars made with graphene oxide (GO) and cement and with similar consistency were experimentally investigated and compared with those of control mort...
TL;DR: In this paper, the authors present an experimental study into the fundamental response of reinforced concrete members, which incorporate rubber particles obtained from recycled tyres, subjected to combined axial bending loading conditions.
Abstract: This paper presents an experimental study into the fundamental response of reinforced concrete members, which incorporate rubber particles obtained from recycled tyres, subjected to combined axial–bending loading conditions. Tests on confined circular members with and without internal hoops or external fibre-reinforced polymer (FRP) sheets are described. The results show that the rubber particles enhance the confinement level activated, with confined/unconfined strength and deformation capacity ratios at least twice those of conventional concrete members. The hoop-confined members provided with 30% rubber developed a typical reinforced concrete behaviour, with relatively limited deformation capacity in comparison with FRP-confined members. The external confinement substantially enhanced the ultimate rotation of members incorporating 30% rubber, with ductility factors reaching up to ten for relatively small eccentricity levels. An increase in rubber content to 60% had a detrimental effect on the axial capacity, but increased the ultimate rotation up to twice in comparison with members with 30% rubber. Based on the test results, a design-oriented constitutive model for FRP-confined concrete and a variable confinement procedure for assessing the strength interaction of circular sections are proposed. The suggested procedures capture, in a realistic manner, the influence of rubber content on the strength and deformation characteristics of confined members.
TL;DR: In this article, single-sided proton nuclear magnetic resonance (1H NMR) was used to quantify the porosity of the concrete cover of a concrete building and the results showed that porosity was increased with different formwork configurations.
Abstract: In this study, single-sided proton nuclear magnetic resonance (1H NMR) was used to quantify the porosity of the concrete cover. Laboratory concrete samples were prepared with different formwork sur...
TL;DR: The expansion deterioration that occurs in concrete structures exposed to high temperature fluctuation in wet environments is often attributed to delayed ettringite formation (DEF) due to the compressive deformation as mentioned in this paper.
Abstract: The expansion deterioration that occurs in concrete structures exposed to high temperature fluctuation in wet environments is often attributed to delayed ettringite formation (DEF). Due to the comp...
TL;DR: In concrete-filled steel tubes (CFSTs), a gap between the steel tube and the core concrete can exist due to inappropriate construction, which will result in a change in the load-carrying capacity.
Abstract: In concrete-filled steel tubes (CFSTs), a gap between the steel tube and the core concrete can exist due to inappropriate construction, which will result in a change in the load-carrying capacity o...
TL;DR: In the precast industry very early age strength development is crucial for productivity, and it is for this reason that industry has been reluctant to embrace the use of ground granulated blast-fur as discussed by the authors.
Abstract: In the precast industry very early age strength development is crucial for productivity, and it is for this reason that industry has been reluctant to embrace the use of ground granulated blast-fur...
TL;DR: The bond response of deformed bars in structural concrete is governed, to a large extent, by the rib-to-concrete contact and interaction, with contact forces depending on both material properties.
Abstract: The bond response of deformed bars in structural concrete is a phenomenon governed, to a large extent, by the rib-to-concrete contact and interaction, with contact forces depending on both material...
TL;DR: In this paper, cohesive and overlapping crack models are integrated in a comprehensive numerical algorithm in order to investigate both tensile and compressive failures in plain or steel-bar steel bars.
Abstract: In the present work, cohesive and overlapping crack models are integrated in a comprehensive numerical algorithm in order to investigate both tensile and compressive failures in plain or steel-bar ...
TL;DR: The random packing of aggregate particles is an important factor affecting the mechanical properties of concrete at the mesoscopic scale as discussed by the authors, and a meso-mechanical pretreatment algori...
Abstract: The random packing of aggregate particles is an important factor affecting the mechanical properties of concrete at the mesoscopic scale. In the current study, a meso-mechanical pretreatment algori...
TL;DR: In this paper, the diffusion mechanism for chloride ions in concrete with varying water/cement ratio (w/c) was studied by chloride ion spray testing, and a new model of chloride diffusion coefficient was proposed.
Abstract: The diffusion mechanism for chloride ions in concrete with varying water/cement ratio (w/c) is studied by chloride ion spray testing. A new model of chloride diffusion coefficient, which varies wit...
TL;DR: In this paper, the behaviour of concrete reinforced with steel fibres at elevated temperatures was investigated in terms of shear deterioration, using three different steel fibre contents (0, 40 and 80 kg/m3).
Abstract: The behaviour of concrete reinforced with steel fibres at elevated temperatures was investigated in terms of shear deterioration. Using three different steel fibre contents (0, 40 and 80 kg/m3), 45...
TL;DR: In this paper, the pull-out behavior of partially pulled hooked-end steel fibres inside an artificial crack exposed to a wet-dry cycle was investigated, and the mechanisms altering the pullout behaviour of the fibres were investigated.
Abstract: This paper presents an experimental investigation into the mechanisms altering the pull-out behaviour of partially pulled hooked-end steel fibres inside an artificial crack exposed to wet–dry cycle...