Concrete maintenance

Concrete Maintenance and closure activities Metal parts treater... 

Concrete Maintenance and closure activities SDU or autoclave (agent-contaminated) Unspecified TSDF (if agent contamination concentration is below release criteria)... 

Green, M. F., Bisby, L. A., Beaudoin, Y., and Labossiere, P., Effect of Freeze-thaw Cycles on the Bond Durability between Fibre Reinforced Polymer Plate Reinforcement and Concrete, NRC Canada, Journal of Civil Engineering, Vol. 27, 2000. pp. 949-959. Neville, A. M., Concrete Maintenance and Repair, John Wiley Sons, Inc.. New York, NY, 1995. 

PhenoHcs that are not heat-reactive may be incorporated into both air-dried and baked oleoresinous coatings. AppHcations vary widely and include clear and pigmented exterior varnishes, aluminum-maintenance paints, 2inc-rich primers, can coatings, insulation varnishes, and concrete paints. As modifiers in a great variety of appHcations, they enhance the performance of oleoresinous and alkyd coatings. 

The market for tar-based road binders has declined considerably for a variety of reasons. Less cmde tar is available and the profits from the sales of electrode pitch and wood-preservation creosote or creosote as carbon-black feedstock are higher than those from road tar. In most industrial countries, road constmction in more recent years has been concentrated on high speed motorways. Concrete, petroleum bitumen, or lake asphalt are used in the constmction of these motorways. In the United Kingdom, for example, the use of tar products in road making and maintenance had fallen from 330,000 t in 1960 to 100,000 t in 1975 and is less than 100 t in 1994, mainly based on low temperature pitch which is not suitable for electrode or briquetting binders, but which is perfectly satisfactory as the basis for road binders. 

Prestressed (posttensioned) concrete tanks cost about 20 percent more than steel tanks of the same capacity. Once installed, however, concrete tanks require veiy little maintenance. A true comparison with steel would, therefore, require evaluating the maintenance cost of both types. 

Rendering plants Feedstock storage and housekeeping Cookers and percolators Grinding Odors SO2, mercaptans, ammonia, odors Particulates (dust) Quick processing, washdown of all concrete surfaces, paving of dirt roads, proper sewer maintenance, enclosure, packed towers Exhaust system, condenser, scrubber, or incinerator Exhaust system and scrubber... 

Questions of the analytic control of maintenance of the bivalent metals cations to their joint presence in materials of diverse fixing always were actual. A simultaneous presence in their composition of two cations with like descriptions makes analysis by sufficiently complicated process. Determination of composition still more complicates, if analyzed object is a solid solution, in which side by side with pair of cations (for example, Mg " -Co ", Mn -Co, Zn -Co ) attends diphosphate anion. Their analysis demands for individual approach to working of methods using to each concrete cations pair. 

The heaviest products obtained directly from oil arc lubricants, waxes, asphalt, and coke. These products have both domestic and industrial uses. Lubricants, for example, are applied in the operation and maintenance of industrial equipment and machinery. Asphalt, because it is not reactive to chemicals in the environment, is a superb material of construction in the building of roads and in roofing. It is also used in the waterproofing of concrete, the manufacture of black paints, and as a material lor tire threads, battery housing, electrical insulation, and other applications. The heaviest of all the petroleum products, coke, is used extensively as a major component of industrial electrodes and as a commercial fuel. 

Barnbrook, G., Durable non slip concrete floors for low maintenance, Building Trades Journal, 12 January (1979). 

Phillips, G., Caring for concrete floors protects profits. Building, Maintenance and Services, 37-38, April (1978). 

Ideally, the walls should be of brick or concrete with an insulated roof. Large areas of glass should be avoided. It is desirable that all routine maintenance and operating functions can be carried out without having to open doorways. Openings and access to the boilerhouse should be away from sensitive areas. Free areas for air for both combustion and ventilation should be through acoustic louver... 

The payoff to society from greater attention to the surface and interfacial engineering of concrete is potentially immense high-tech concretes that will prolong the life of public works and reduce their maintenance costs as well as dramatic new applications for this old reliable material. 

Where installation costs are not prohibitive, the ideal remedy would be a suspended concrete floor above a well ventilated space, with the ground below the ventilated space sealed by concrete incorporating a polymeric radon barrier. This would effect a passive remedy requiring little maintenance and no running costs. 

On November 14, 1993, a 600-foot concrete stack collapsed onto a coal-fired electric power plant killing one person and injuring four others. The incident occurred at a Texas Utilities plant near Mt. Pleasant, Texas while the facility was shut down for maintenance. Extensive damage occurred within the plant resulting in an extended outage. Destroyed in the incident were a 750 MW generator, a steam boiler, compressor, two... 

Concrete dampproofers are integral admixtures that alter the concrete surface so that it becomes water repellent, or less wettable . This is illustrated in Fig. 4.1, which shows a close up of a water drop on a surface of a concrete that has had a dampproofer incorporated into it. This water repellency conferred on the concrete is only effective in preventing water from entering the surface when the applied pressure is small, e.g. rainfall in windy conditions, or capillary rise. The latter effect is shown in Fig. 4.2. In view of this, these materials are used normally for improving the quality of concrete pavers, tiles, bricks, blocks and cladding panels where the additional benefits of reduced efflorescence, the maintenance of clean surfaces and the more even drying out of adjacent bricks and panels are also obtained. 

The dampproofmg admixtures will, therefore, improve the aesthetic qualities of concrete in terms of maintenance of a clean appearance over a prolonged period of time without adverse effects on other properties, and in the areas of freeze-thaw resistance, shrinkage under wet-dry cycling and reinforcement protection, may contribute beneficially. 

The durability of many thousands of kilometers of concrete highways, airport runways and parking lots built in geographical areas where freeze- thaw conditions are experienced over a period of 30 years attests to the most dramatic cost benefits afforded by air entrainment. Reduced maintenance and replacement costs that derive from the use of both air-entraining and... 

According to the vendor, equipment costs for the EHS prototype unit are estimated at 120,000. Operating costs including consumables, maintenance, capital, and labor are estimated at 5 to 10/ft of treated concrete (D162209, p. 9). 

The Texas Transportation Institute has just completed a very extensive two year FHWA sponsored program to look into other aspects of safety and environmental impact of sulfur-asphalt construction [53]. A number of typical sulfur-asphalt and sulfur-concrete paving systems were evaluated to assess their potential environmental impact and establish safety considerations relative to their formulation, construction and maintenance. The environmental impact was investigated from the formulation stages, through weathering, and included considerations of simulated fires and chemical spills. 

After 1- years, the Portland cement concrete control samples at Corpus Christi that were installed contiguous to and intermixed with the sulfur concrete test samples showed total disintegration, whereas the sulfur concrete exhibited no identifiable attack (figure 2). In the summer of 1979, the ongoing maintenance needs at the Corpus Christi plant placed rehabilitation of a cellhouse basement floor in a priority position. The opportunity to perform the repair work on a full-scale basis, utilizing Bureau of Mines technology for sulfur concrete in lieu of portland cement concrete, was accomplished by an agreement for a demonstration project executed between the Bureau of Mines and Asarco. 

ASTM D98-87, AASHTO2 M144-86 road conditioning/maintenance curing concrete solution unspecified concentrations dry three grades based on 77%, 90%, and 94% minimum assay 14,15... 

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