... of tension crack two hours before, in response to the growth of seepage face area. This large time different between failure occurrence and failure initiation indicates the existence of apparent cohesion, which was maintaining the local stability of the slope. Soil moisture content at failure Throughout...

... water post-tensioned tendon permission vertical deviation krishna vigneshwaran responsibility publication retrieval system houston permeh material protection grout lau Paper No. 17986 Development of Chemical Deficiencies in Post-Tension Grout Materials Rutambara Sonawane, Samanbar Permeh...

... riser corrosion ampp pt cable drying tendon unbonded post-tensioned cable means well integrity strand permission deterioration moisture Abstract Unbonded post-tension (PT) tendons have been used for many years to reinforce concrete structures. Generally, these structures have performed...

... trapping that may otherwise result in permanent attachment of moisture to the metal's surface via surface tension and capillary action. Previous studies by Rana et al. and Pojtanabuntoeng et al. have reported the influence of contact-free insulation design and low point drains on the CUI performance...

.... has addressed on how the use of insulation stand-off and low point drains can maximize the moisture removal from thermally insulated systems via reducing the surface tension at the metal-insulation interface. 11 There are many pipelines in today s era that are out of service due to maintenance...

... was conducted for three grout materials mixed and cast under non-ideal conditions (grout pre-exposure and grout mixed with 10% excess mix water) to promote material deficiency to assess the suitability of the laboratory test methods for use in practice. Keywords: Grout, Post-Tension, Corrosion, Deficient...

... Expansion-shell rock bolts are a primary means of roof support in U.S. coal mines. The capacity to support the roof, however, is diminished or lost when the bolts lose their installed tension. Roof shales are common occurrences in coal mines and commonly are sensitive to changes in moisture condition...

... expressed in this paper are solely those of the author(s) and are not necessarily endorsed by the Association. failure of the prestressing steel. For steel embedded in concrete including pre-tensioning strand, cementitious materials with alkaline pore water, low permeability to moisture, oxygen...

... INTRODUCTION ABSTRACT Dehumidified storage areas are designed to eliminate moisture and thereby corrosion damage. The goal of a dehumidified storage system is to keep the relative humidity (RH) below a certain level (75%) whereby the adverse effects of humidity (rust, condensation, mold...

... than in tension, it is claimed that the tensile prestrain due to moisture softens the response of the beams. INTRODUCTION It is well-known that moisture has a weakening effect on the strength of silicate-rich rock. The mechanism often cited for this environment-sensitive behavior is stress...

... material and strength property (tension or compression). This equation and curves relating dynamic response versus moisture content permit nondestructive estimation of average uniaxial strength in either tension or compression. The first sections of this paper deal with rock properties, source of energy...

.... The water saturation strongly affects the strength of rocks. Although there is no generally accepted explanation for the effect of water content on the rock strength, several mechanisms are often used to explain it: Fracture energy reduction, Capillary tension decrease, Pore pressure increase...

... was compiled and corrosion of steel post-tensioned components have been observed at sulfate-to-hydroxyl ratio greater than 0.1. The critical sulfate concetration in the corrosion mechanism of steel in well-hydrated grout has not been elucidated, but the deficient grout with high moisture content may...

... ABSTRACT Recently, corrosion problems have occurred with new formulation grouts in post-tensioned tendons that were specified to meet low bleed-water requirements. Severe material deficiencies were observed in external post-tensioned tendons of several bridges in Florida, one of which had...

... then tested in tension, quasi-statically at 0.05 inches/minute at both room temperature and −30°C. The soaked samples gained over 13 times the percentage of water the vapor-exposed samples did at 10 times the rate. However, the results show small absolute moisture gains by either the soaked or vaporexposed...

... Abstract Analysis of deficient grout in Florida post-tensioned (PT) bridges where severe corrosion developed indicated enhanced sulfate ion concentration, high pore water pH, and enhanced moisture content. However, limited information is available on the corrosion behavior of PT strand...

... the effect of water saturation on the deformation and failure of Sanjome andesite through compression and tension tests. The authors first prepared the rock specimens of six water-saturation conditions with varying the time the rock specimens were submerged in water and then dried. The water saturation...

... estimation surface tension Abstract Drying induced deformation is a well-known coupled process of deformation and moisture transfer within a porous material. It is important to be able to predict the drying shrinkage behavior to overcome engineering issues associated with desaturation of soft...

... and environmental conditions, particularly moisture content. The published results of an equally extensive testing program on an altered igneous rock (quartz diorite) are compiled and reviewed to reveal an abrupt decrease in measured strengths between specimens tested in the laboratory and those tested in place...

... ABSTRACT The assessment of recently failed external post-tensioned tendons from a bridge in Florida provided some insight on the material and environmental conditions of the tendon components leading to the failure. Segregated grout material was observed in the vicinity of the corrosion...