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A study of the water permeability of Portland cement concreteBlackman, James Samuel January 2011 (has links)
Typescript, etc. / Digitized by Kansas State University Libraries
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Pore pressure in concrete : theory and triaxial testsLi Kim Mui, S. T. January 1987 (has links)
No description available.
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Development of equipment to measure wetting of stored grainBreton-Caneva, Edgard M January 2010 (has links)
Digitized by Kansas Correctional Industries
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Measurable Mictostructural Properties and their Relationship to Chloride Migration and Durability of ConcreteLu, Shan January 2001 (has links) (PDF)
No description available.
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A simple method of test for determining the permeability and capillarity of concreteChen, Yah-Tung. January 1959 (has links)
Call number: LD2668 .T4 1959 C45
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Permeance of concrete to air and water vaporSamarai, Mufid A. January 1961 (has links)
Call number: LD2668 .T4 1961 S27
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The secondary permeability of "impervious" cover in Austin, TexasWiles, Thomas Jefferson, 1970- 24 June 2013 (has links)
The term "impervious" is commonly used in urban settings to describe the permeability of buildings, roads, and parking lots. When estimating recharge to an aquifer underlying an urbanized area, impervious cover becomes a prime consideration. It is commonly assumed that an increase in impervious cover leads to a decrease in precipitation recharge. However, even a cursory glance at most roads, sidewalks, or parking lots reveals that, far from being impervious, there are abundant fractures that may provide avenues of infiltration. For this study, method was developed to determine the secondary permeability of pavements using a double ring infiltrometer to measure the infiltration rate of water into fractured pavements. Linear extrapolation is employed to determine the infiltration rate as the water depth approaches zero, which is used as a proxy for hydraulic conductivity by assuming that the gradient is unity. Data were collected on concrete and asphalt pavements located in Austin, Texas, at each point a fracture or expansion joint intersected along 30-meter scanlines. By dividing the sum of the discharges for each fracture by the area represented by the scanline we are able to determine the equivalent-porous-media hydraulic conductivity. The equivalent hydraulic conductivities for discrete fractures were found to range at least three orders of magnitude, from >10⁻² to 10⁻⁵ cm/sec; scanline hydraulic conductivities range two orders of magnitude from >10⁻⁴ to 10⁻⁶ cm/sec; permeability along the scanlines tends to be dominated by one or two highly conductive fractures; and the hydraulic conductivity of the entire paved surface is 5.9·10⁻⁵ cm/s. Both apertures and point hydraulic conductivities were found to have logarithmic distributions but cross plots demonstrated no correlation, which indicated that a combination of the fill material and sub grade, not the fractures and expansion joints themselves, limit infiltration. By multiplying the paved surface hydraulic conductivity by the time the surface can be expected to be saturated, we find that 170 mm or 21 percent of mean annual rainfall is available as potential recharge. When coupled with an enhanced subsurface permeability structure resulting from the installation of utilities and the reduction of evapotranspiration from the reduction of vegetation, the net effect of roads and parking lots could be an increase in precipitation recharge. / text
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Curing and the durabilty of concreteBallim, Yunus 08 June 2016 (has links)
A thesis submitted to the Faculty of Engineering,
University of the Witwatersrand, Johannesburg, in
fulfilment of the requirements for the degree of Doctor
of Philosophy.
Johannesburg, 1994. / This thesis presents the details and results of an
investigation into the effects of early age curing on
the durability of concrete The two main objectives of
the investigation were:
to develop simple test methods, applied at
relatively early ages, for measuring the effects
of early-age moist curing on the advance of
hydration in the cover zone of concrete;
to quantify the effect of early age curing on the
durability performance of concretes of various
strength grades and made with different binder
types.
[Abbreviated Abstract. Open document to view full version]
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La perméabilité des réservoirs à lisier en béton /Denis, Jacques January 1989 (has links)
Two underground concrete manure reservoirs of 70 m$ sp3$ were tested for their infiltration rate to water as well as to 1% and 3% total solid dairy manure. Positive and negative infiltration were measured for the water test while only negative infiltration was measured with the manure. / Positive infiltration is met when the water table into the soil is above the liquid level into the reservoir. In that case, the water is moving from the outside to the inside of the reservoir. An opposite situation is met when the infiltration is negative. / From the results, the infiltration rate varied from 0.00 to 6.684 $ times$ 10$ sp{-7}$ m/s. The minimum value was recorded at the reservoir 55 with 1% of total solid manure and the maximum value was recorded with same reservoir with positive pressure to water.
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La perméabilité des réservoirs à lisier en béton /Denis, Jacques January 1989 (has links)
No description available.
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