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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 55 for “"drying shrinkage"”.
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Drying shrinkage of Portland cement mortar
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Civil and Sanitary Engineering, 1959.
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Drying Shrinkage and Microstructure of Hydrated Calcium Silicates
Made available in DSpace on 2014-12-14T15:24:03Z (GMT). No. of bitstreams: 1 7913521.pdf: 7919333 bytes, checksum: 93329c9cc76cd3e2ac21fd6a8cc48f0d (MD5) Previous issue date: 1978
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Drying shrinkage of self-compacting concrete incorporating fly ash
… term (more than two years) free and confined drying shrinkage magnitude and behaviour of self-compacting concrete (SCC) and compare with normal concrete (NC). For all SCCs mixes, Portland cement was replaced with 0-60% of fly ash (FA), fine and coarse aggregates were kept constant at 890 kg/m3 …
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The drying shrinkage in three-dimensional printing and its dependence on the properties of the powder and the binder
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1996.
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ΜΕΛΕΤΗ ΚΑΙ ΠΑΡΑΣΚΕΥΗ ΚΥΨΕΛΩΤΟΥ ΚΟΝΙΟΔΕΜΑΤΟΣ ΥΔΡΟΘΕΡΜΙΚΗΣ ΚΑΤΕΡΓΑΣΙΑΣ ΜΕ ΜΕΙΩΜΕΝΕΣ ΣΥΣΤΟΛΕΣ ΞΗΡΑΝΣΗΣ
… EFFECTIVE CONTROL OF THE PROBLEM ARISING FROM DRYING SHRINKAGE HIGH VALUES DETECTED AT AUTOCLAVED CELLULAR CONCRETE (A.C.C.). FROM THE PROCESSING AND EVALUATION OF THE EXPERIMENTAL MEASUREMENTS THE FOLLOWING CONCLUSIONS HAVE BEEN REACHED: A. THERE IS A DIRECT CORRELATION BETWEEN THE DRYING …
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Understanding effects of pre-soaked lightweight aggregate on volume stability of mortar and concrete mixtures
Shrinkage cracking is a predominant deterioration mechanism greatly affecting the durability and integrity of concrete structures. This is especially the case for concrete bridge decks due to the large surface-to-volume ratio of these types of structures, which results in a high rate of moisture …
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Incorporation Of High-Volume Fly Ash To Produce Structural Lightweight Concrete
… flexural strength, modulus of elasticity and drying shrinkage for up to 28 and 56 days are investigated as well as slump and unit weight for fresh density. The durability properties such as abrasion resistance, water absorption, resistance to chloride ion penetration and freeze and thaw …
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Design and performance of cost-effective ultra high performance concrete for bridge deck overlays
… was examined. The efficiency of various shrinkage mitigation approaches in reducing autogenous and drying shrinkage of optimized UHPC mixtures was evaluated. This included the use of CaO-based and MgO-based expansive agents, shrinkage-reducing admixture, and pre-saturated lightweight …
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The effect of high volumes of ungraded fly ash on the properties of foamed concrete
… porosity, permeability, water absorption, drying shrinkage, elastic deformation, creep, and void size distribution. The use of high volumes of unclassified ash did not appear to have any significant detrimental effects on the measured properties of the foamed concrete. Although the rate of …
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The Role of Reactive MgO as an Expansive Additive in the Shrinkage Reduction of Concrete
… mainly dam construction in China, for thermal shrinkage reduction since the 1970’s. At ~4% addition to the cement by weight, it is much simpler than conventional shrinkage measures and in particular, reduces the quantity of crack control reinforcement used. The mechanism is similar to …
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Effect of Early Curing Conditions on Permeability of Concrete
… gradients caused by heat of hydration or drying shrinkage due to premature loss of water.
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GFRP reinforced concrete : environmental and movement characteristics
… on elastic modulus and creep in compression, and drying shrinkage of concrete with and without SRA were considered and compared to concrete specimens with no reinforcement. Finally, a comparison between theoretical values and experimental measurements of elastic modulus, creep and drying shrinkage …
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Admixture compatibility and freeze-thaw resistance of concrete prepared using commercially produced limestone calcined clay cements
… flexural strength) and durability properties (drying shrinkage and freeze-thaw resistance) were documented for LC3 concretes using standardized testing procedures. While all concrete mixtures produced satisfied the compressive and flexural strength requirements for paving concrete, concrete …
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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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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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Drinking Water Treatment Waste as an Alternative for Internal Curing and Cement Replacement in Concrete
… mechanisms broadly grouped into autogenous and drying shrinkage. These mechanisms cause cracks which become high permeability routes for water and aggressive ion movement, such as chlorides to reinforcing steel. Drying shrinkage can be controlled by appropriate curing methods, however proper …
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The use of Lethabo field 2 PFA in pavement quality concrete
… by vehicles moving across it and the effects of drying shrinkage and thermal changes. Failure of the pavement by either excessive cracking or degradation of the surface results in poor riding quality and low skid resistance. The inclusion of Pulverised Fuel Ash (PFA), otherwise known as fly ash, …
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Phase transition induced deformation in porous media
… accompanied by mechanical deformations, such as drying shrinkage in cement. A parallel computing library is developed to simulate the adsorption/desorption processes using a lattice gas model.
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Properties and performance of high strength fibre reinforced concrete by using steel and polypropylene fibres
… due to the effect from freezing and thawing, shrinkage and expansion, aggressive environment, earthquake and drastic increase of live loads. The most common sign of deterioration in concrete is cracking. Plain or unreinforced concrete is characterised by its low tensile strength, low strain …
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