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Showing 1 to 20 of 65 for “"Freezing and thawing"”.
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Freezing and thawing of exterior tile mortar joints
… Technology, Department of Building Engineering and Construction, 1949
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Experimental investigation of soil volume changes during freezing and thawing
… behaviour of soils during freezing and thawing, with focus on frost heave and thaw settlement. Ground freezing is a natural phenomenon that affects civil engineering projects, especially in cold regions or where artificial ground freezing (AGF) is employed. Freezing causes …
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The effect of alternate freezing and thawing on the strength of concrete
Made available in DSpace on 2016-11-09T23:48:06Z (GMT). No. of bitstreams: 2 5994864_opt.pdf: 5626120 bytes, checksum: e96fe8025d45028b84dc2a6d0a69aa41 (MD5) license.txt: 4183 bytes, checksum: 1dcc2037833d76bede73d5717587543b (MD5) Previous issue date: 1916
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Effect of curing procedure on the freezing and thawing durability of concrete
Results indicate that the durability of the concrete mixes using poor aggregates can be improved to a considerable extent by moist-curing.
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The Effect of Air Drying Upon The Freezing and Thawing Resistance of Concrete
Made available in DSpace on 2014-12-08T23:56:46Z (GMT). No. of bitstreams: 1 6706667.pdf: 2557375 bytes, checksum: 970e8269395bdbbf274404ae8de8fa70 (MD5) Previous issue date: 1966
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Effects of extended cycles of open system freezing and thawing on a clay-lime mixture
… was to evaluate effects of long term open system freezing and thawing on unconfined compressive strength of a lime-clay mixture and determine if length of curing has appreciable effect on strength and durability of the mixture. Soil specimens were made by compacting the soil slightly above optimum …
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Mitigation and Evaluation of Alkali-Silica Reaction (ASR) and Freezing and Thawing in Concrete Transportation Structures
<p>An evaluation of alkali-silica reaction (ASR) and freezing and thawing (F/T) in concrete transportation structures is presented along with mitigation methods for slowing the rate of deterioration in concrete. A combination of field and laboratory testing confirms ASR deterioration is exacerbated …
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The impact of variation in freezing and thawing process parameters on the critical quality attributes of a monoclonal antibody
… the stabilization of both the finished product and its processing intermediates during storage. Freezing and frozen storage is widely applied to improve stability of the bulk drug substance. The process of freezing a protein results in stresses that can cause protein degradation and subsequent …
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Effect of freezing and thawing on unconfined compressive strength of clay-lime mixture with and without air entraining agent
… study was twofold: 1. To determine the effect of freezing and thawing on the loss in strength of lime-soil mixture. 2. To investigate the effect of the addition of an air entraining agent on the freezing and thawing durability of lime-soil mixtures. For the first part, twelve specimens were …
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The effects of various levels of compressive stress fields on the deterioration rate and microcracking of plain concrete subjected to freezing and thawing
… to the direction of the applied stress field and in any plane parallel to this direction when the members were subjected to freeze-thaw damage. 3. The cracks are assumed to start at the boundary of a capillary within the aggregate and propagate through the aggregate to the aggegate- mortar …
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Advances in measuring parameters of the air-void system in hardened concrete
To improve the freezing and thawing resistance of concrete, air bubbles are entrained and distributed evenly and closely. Evaluation of the parameters of the air-void system in hardened concrete is detailed in ASTM C457 “Standard Test Method for Microscopical Determination of Parameters of the …
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Calibration of sonographic gel probe covers for in-vivo mechanical testing
… delivery. The condition is often misdiagnosed and presents a significant challenge for the clinical community. In order to establish better diagnostic criteria for cervical insufficiency and to improve assessment of preterm delivery risk for the individual patient, a non-invasive medical …
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Effect of pre-stressing on the durability of portland cement concrete
… is extensively used in bridge construction and that it holds potentialities for eventual use in pavement construction, and that methods must be investigated to utilize an otherwise rejected aggregate which cannot be used for its poor performance under natural weathering, it has become of …
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Evaluation of different treatments to improve the durability of concrete having deleterious chert particles as its coarse aggregate
On the basis of freezing and thawing tests of air-entrained concretes having poor quality cherts as course aggregates subjected to three different treatments for improving durability, the following conclusions have been derived: 1. Removal of cherts lighter than the BSSD specific gravity of 2.5 by …
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Evidence of Bacteriocinogeny in Yersinia Ruckeri
… the antagonistic substance. Extracts prepared by freezing and thawing of the producer isolates exhibited antagonistic activity demonstrated by a thin layer technique. The substance is a heat stable, chloroform resistant, trypsin sensitive protein with an estimated molecular weight of 60,000 to …
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Freeze-Thaw Resistance and Microstructural Characteristics of Concretes Containing Pozzolans
… the effect of air entrainment on workability and air content of fresh concrete incorporating silica fume (SF), metakaolin (MK), fly ash (FA) and blends of FA and MK and to assess the effects of such pozzolans on freeze-thaw durability, air void system and microstructure of hardened concrete. …
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Thermo-mechamical modelling of arch dams for performance assessment
… various temperature related components and procedures for undertaking a successful performance analysis of concrete arch dams. Arch dams experience high temperature variations, which are generally assessed using finite element models. Deterioration of arch dams is caused principally by …
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Stress-tolerant bioremediation strategy for cold-climate sites: laboratory, modelling, and field studies for extending petroleum hydrocarbon biodegradation to seasonally freezing and frozen contaminated soil phases
… low temperatures, limited field accessibility, and low microbial activity. Conventional bioremediation practices have focused on short summers in cold climates, but the feasibility of extending hydrocarbon biodegradation to sub-zero temperatures has not been extensively explored. How …
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