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Showing 1 to 20 of 44 for “"Concrete surface"”.
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Concrete surface coatings and the influence of substrate moisture condition on bond strength
Concrete structures, in particular reinforced concrete structures, have been designed and built for many years. Many previously built structures are now being compromised with regard to their condition and structural integrity. There has developed a need to maintain these structures and protect …
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Moisture Conditions and Frost Resistance of Concrete in Hydraulic Structures
… a considerable impact on the deterioration of concrete. Both superficial and internal damage, which are suspected to have been caused by frost action, have been found in concrete in hydraulic structures. These observations have raised questions about the long-term behaviour of hydraulic …
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Another Concrete In the Wall
concrete has a memory. It stores the construction sequences. It shows what it is made of and how it is made. The texture of the formwork, the color difference of the pours, and the shadows of the metal ties combine to layer the beauty of concrete. The aim of this study is to explore the instruments …
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Performance Evaluation of RC Flexural Elements Strengthened by Advanced Composites
… of composite systems made of reinforced concrete, Fibre Reinforced Polymers (FRPs) and adhesives was studied during the current research. The experimental investigation was principally concentrated on the potential use of Kevlar® 49 (aramid fibre) for RC beam strengthening. <br/><br/>The …
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Machine Learning Based Prediction of Reinforced Concrete Members’ Shear Friction Capacity
… by which shear forces are transferred across concrete-to-concrete interfaces. Shear transfer across a plane involves a complex interaction of several phenomena, such as concrete surface condition and cohesion, concrete strength, and steel reinforcement strength and reinforcement ratio. …
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Effects of aging on bond between FRP and concrete
… of FRP composite wraps adhered/bonded to concrete surface. Focus of the study is on the bond degradation when the hybrid structure is exposed to different adverse environmental conditions including sustained stress. The study involves using an epoxy based system to bond glass and carbon …
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Shear behavior of full-scale reinforced concrete members strengthened with anchored CFRP materials
… due to debonding between the material and the concrete surface. In order to better understand the shear behavior of members strengthened with anchored CFRP strips, ten tests were performed on large-scale T-beams. The beams were tested with various CFRP layouts, CFRP reinforcement ratios, and …
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Absorbent Household Materials For The Collection Of Ignitable Liquid Residues From Surfaces Of Varying Porosity
… containing ILs. The substrates, such as concrete and wood, are removed from the scene by methods that are time consuming, and require heavy machinery and tools. The evidence is transported in air-tight containers to the laboratory where analysts identify the chemical classification of the …
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Quantification of rail seat load distributions on concrete crossties
… magnitude and distribution of load imparted to concrete crosstie rail seats. The rail seat load distribution is critical to the analysis of failure mechanisms associated with rail seat deterioration (RSD), the degradation of the concrete surface at the crosstie rail seat. RSD can lead to wide …
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Prediction of erosion in cementitious materials subject to high thermal and pressure loading
… the modelling of onset of failure in limestone concrete, due to hot jet exhaust gases impinging on the concrete surface. The temperature distribution was produced using a constant jet temperature with a standard finite difference approximation and the thermal properties of concrete which varied …
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A New CFRP-UHPC System for Strengthening Reinforced Concrete T-Beams
… construction field, strengthening of reinforced concrete beams using FRP laminates became a common repair and retrofit technique. Traditionally, Reinforced Concrete (RC) beams are strengthened by adhering FRP laminates to the tension side of the beam to work as an additional tensile …
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Abrasion resistance of IV-RCC used to construct spillway concrete steps of South African dams
… on abrasion resistance of roller compacted concrete designed for the spillway steps of dams owned by the Department of Water and Sanitation. Literature on abrasion resistance of concrete has been reviewed and factors affecting abrasion resistance are discussed. Among these include hardness …
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Adherencia al hormigón de morteros de diferentes bases químicas
… polimérico de baja permeabilidad. SUMMARY Concrete made of portland cement is recognised as a durable material, which is able to withstand many of the mechanical and chemical demands, according to its nature. Nevertheless, its chemical resistance against most of the acids, either organic or …
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Effect of concrete heterogeneity on FRP-to-concrete bond behaviour
… to their various advantages. In FRP-strengthened concrete structure, one of the main failure modes is the premature bond failure, which prevents the exploitation of the full capacity of FRP strengthening, and leads to brittle performance of the strengthened structure. As a result, the bond …
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Determination of the service life of concrete sealers on horizontal and vertical bridge members
Due to the increasing rate of deterioration of concrete bridges caused by exposure to chlorides, it has become apparent that effective protection methods need to be employed which will prevent chlorides from reaching critical contamination within the life of the structure. One method of protection …
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Advancing Rockfall Hazard Assessment through Data-Driven Modelling Based on Laboratory-Scale Experiments
… release angles (15° and 30°) onto a horizontal concrete surface. Motion data captured from dual camera angles were analyzed to evaluate key parameters, including the coefficient of restitution (COR), translational and angular velocity, runout distance, and trajectory dispersion. The results …
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Laminar cracking in post-tensioned concrete nuclear containment buildings
… the long-term integrity of post-tensioned concrete containment buildings (PCCs) is necessary for continued operation of the reactors they house. In 2009, during preparations for a steam generator replacement, extensive subsurface laminar cracking was identified in a portion of the Crystal …
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Shear strengthening of reinforced concrete beams with bi-directional carbon fiber reinforced polymer (CFRP) strips and CFRP anchors
… by debonding of the CFRP laminates from the concrete surface. In order to prevent or delay debonding, CFRP anchors were used to provide an alternative means of transferring forces from CFRP strips to the concrete. Previous tests on prestressed I-girders strengthened with uni-directional and …
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Effects of water chemistry, temperature, gaseous cavitation & phosphate inhibitors on concrete corrosion
Concrete corrosion has serious societal and economic impacts and is an important concern in a utility's overall corrosion control strategy. Though concrete based pipes and linings are only restricted to the distribution mains, they still make up a large percentage of the drinking water …
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THE SHEAR BEHAVIOUR OF THE REINFORCED CONCRETE FOUR-PILE CAPS
… the shear capacity of 2-way spanning reinforced concrete pile caps from bending theory-based empirical design formulae. This causes designers difficulty to predict an accurate shear capacity of the pile cap. The inherently empirical character of the formulae is due to the fact that the formulae …
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