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Showing 1 to 16 of 16 for “"Restrained Shrinkage"”.
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A Study of Free and Restrained Shrinkage of Mortar
Made available in DSpace on 2014-12-10T17:25:30Z (GMT). No. of bitstreams: 1 6503618.pdf: 3941695 bytes, checksum: 914b97073fb89606aa356e452d5ce194 (MD5) Previous issue date: 1964
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Influence of mix design parameters on restrained shrinkage cracking in non-structural concrete patch repair mortars
… and their corresponding interactions, on restrained shrinkage cracking in non-structural concrete patch repair mortars (PRMs). This dearth of information makes the design and development of PRMs with improved resistance to cracking challenging. The problem is further compounded by the fact …
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The influence of fly ash and ground granulated blastfurnace slag on restrained shrinkage cracking of bonded overlays
… technique. However, bonded overlays are prone to restrained shrinkage cracking which impairs their performance. The mechanism leading to restrained shrinkage cracking of bonded concrete overlays is complex and depends on material properties, such as shrinkage, tensile strength, elastic modulus, …
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Tensile relaxation of bonded concrete overlays
Restrained shrinkage in bonded concrete overlays can cause stress build up, cracking and even debonding. Tensile relaxation is the main mechanism of stress relief in concrete overlays. This results in less possibility of cracking and debonding. The research described in this study presents an …
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Development, application and early-age monitoring of fiber-reinforced ‘crack-free’ cement-based overlays
… for lack of durability in repairs, early-age shrinkage cracking in overlay materials is of utmost importance. Fiber-reinforcement can be used to alleviate some of the issues related to plastic shrinkage. However, quantifying the performance of cement-based composites under restrained shrinkage …
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Characterization and performance of eco and crack-free high-performance concrete for sustainable infrastructure
… kg/m<sup>3</sup> and develop high resistance to shrinkage and superior durability. A stepwise mixture design methodology was proposed to: (i) optimize binder system and aggregate skeleton to optimize packing density and flow characteristics; (ii) evaluate synergy between shrinkage mitigating …
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Investigating repair mortars containing superabsorbent polymers as a method of internal curing to improve concrete patch repair performance
… the new and old concrete due to differential shrinkage between the concrete substrate and overlay. These differential shrinkages typically result in the build - up of tensile stresses within the overlay. If the concrete does not possess sufficient tensile strength, the overlay will crack and …
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Assessing the age at cracking of concrete repair mortars
… differences in the two composites, differential shrinkage occurs. This leads to overlay shrinkage restraint by the relatively mature substrate. Restrained shrinkage in bonded overlays can cause stress build up and may result in cracking. Cracking due to restrained deformation is a major problem …
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The effect of aggregate on the age at cracking of bonded concrete overlays subjected to restrained deformation
… volume changes can be attributed to thermal and shrinkage differences, with drying shrinkage being identified as they key source of the volume change. When the resulting induced stress form the differential volume changes exceeds the intrinsic tensile strength of the repair material, cracking …
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Development of Concrete Shrinkage Performance Specifications
… types of deformation experienced by concrete is shrinkage. The four main types of shrinkage associated with concrete are plastic, autogeneous, carbonation and drying shrinkage. The volume changes in concrete due to shrinkage can lead to the cracking of the concrete. In the case of reinforced …
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Investigating the performance requirements for proprietary concrete repair materials with respect to durability and cracking resistance
… strength, elastic modulus, tensile relaxation, restrained shrinkage cracking and drying shrinkage. Durability index tests of OPI, CCI WSI were also done. Twelve proprietary repair mortars were tested in the laboratory. Their chemical and physical characteristics based on the aforementioned …
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Alternative patch repair materials for rebar corrosion damage
… as a consequence of the widespread occurrence of shrinkage cracking and poor substrate-patch adhesion leading to debonding of the patch repair. From a practical point of view, such failed repair systems essentially restore the repaired concrete back to a deteriorated state. The underlying cause of …
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Engineering properties of sulphate-bearing clay soils stabilised with lime-activated ground granulated blast furnace slag (GCBS)
… due to the creation of pore space resulting from restrained shrinkage of gels by inert particles during drying in this coarser, natural clay. No significant trend in the effect of curing temperature on the pore size distribution could be identified from the data.<br/><br/>The development of …
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Corrosion Assessment for Failed Bridge Deck Closure Pour
… program. Corrosion evaluation and concrete shrinkage characterization were conducted in this research. The corrosion evaluation study included visual observation, clear concrete cover depth, concrete resistivity using single point resistivity, half-cell potential, and linear polarization …
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Fractionated reclaimed asphalt pavement as a coarse aggregate replacement in a ternary blended concrete pavement
… In this study, the concrete free drying shrinkage was found to be unaffected by the coarse FRAP replacement levels and total cementitious content utilized. At the 0% and 50% FRAP contents, specimens under restrained ring shrinkage (AASHTO T334) did not crack after 90 days. The 50% FRAP …
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Mitigation of early age cracking of concrete for bridge decks
In order to reduce reconstruction time and costs in order to better serve the general public a need has arisen for longer service life when considering concrete bridge decks for highway applications. Service life of concrete bridge decks is often cut short indirectly, due to deterioration …