Papers by Keyword: Waterproofing

Abstract: Through the indoor waterproof test, the water pressure resistance performance of the waterproof system formed by setting embedded grouting pipe in the middle of double water swelling sealants was studied to ensure that the station pipe joint could meet the operation requirements. The results show that there must be enough distance between the outside sealant and the edge of the pouring concrete, otherwise the new and old concretes cannot be poured tightly; after swelling, the water pressure resistance of sealants is improved in the range of 0-0.55 MPa, with individual differences; the two kinds of slurries have obvious influence on the improvement of water pressure resistance, but the improvement effect of waterborne epoxy slurry is better than that of polyurethane slurry.

Abstract: Reinforced concrete foundation, rigid pavements, and other structural members with attachment with ground or salty water like piers or retaining walls and others, subjected to chloride and sulfate salts attacks and that leads to damaging the structures or at least reduce durability, some concrete admixtures like waterproofing admixtures or polymers reduce permeability and increase mechanical properties and also durability. This research aims to improve the quality of concrete and reducing corrosion of steel reinforcement by using integral waterproofing admixture, styrene-butadiene rubber (SBR) and polypropylene fibers. mechanical properties such as compressive, flexural strength highly improved in this study. The reduction of weight of steel reinforcement by subjecting reinforced concrete specimens to chloride water (6% concentration) was 2.61 % for ordinary reinforced concrete and by using waterproof –polymer concrete with poly fibers, the reduction was less and its value was 0.93% and that was for 6 months’ exposure, and for 1-year exposure, the reduction in steel reinforcement weight was 4.72% for ordinary concrete and 1.4% for waterproof concrete.

Abstract: In the work the bituminous-polymeric composition stable against action of external factors is designed taking into account literature-patent researches and industrial needs. The basic physical-mechanical and thermophysical properties of the designed bituminous-polymeric composition are investigated, and also change of water absorption, shrinkage with time and flammability is studying. The technology of manufacturing bitumen-polymer composition in production is described. The designed bituminous-polymeric composition on some indicators, in particular on heat resistance and flexibility is better than existing analogs that allows its introduction.

Abstract: An example of a successful reconstruction of the small but important and culturally significant structures Plecnik’s footbridge located on the premises of Prague Castle is discussed in this paper. The building was severely disrupted for 10 years after a previous reconstruction. This damage and degradation was caused mainly as a result of faults incorrectly designed new waterproofing and water freezing in the new drainage pipe bridge. Technically properly designed and in 2006, well made reparations, resulting problems removed and for 10 years after completion fulfils its function perfectly and reliably protects valuable object

Abstract: Mexican cacti have captivated the scientific community due their extraordinary characteristics and benefits.This research established a new way to use this ancestral plant as a substitute for other construction materials that given their industrial and technological processes have-in several cases-skyrocketed their costs, besides of being a constant hazard for the environment. Thus, by looking back how ancestors used to solve their construction needs, it would ultimately allow us to find better ways to protect the environment. Production process is analyzed; experimented with it; and its prominent characteristics analyzed derived from Opuntia ficus-indica extract combined with other natural materials to be then used it as a waterproofing material.

Abstract: The paper deals with two problems in the field of cement-based crystalline coating: The uncertainties about the depth effect of crystalline coating and the influence of curing on resulting waterproofing effect. For coating depth effect investigation the authors used a method based on the analysis of surface hydrophobicity (contact angle method). The depth effect of crystalline coating can be detected on the basis of the different surface hydrophobicity in various distances from the coated surface. The results of measurement showed that the tested crystalline coatings affect concrete microstructure to depth of approximately 50 - 60 mm (measured 4 months after the coating application). But it turned out that used method is not appropriate for this purpose because the results can be affected by a lot of influences and it is necessary be cautious about the conclusions. Another part of experimental program showed that the curing of crystalline coating during its ageing is absolutely necessary for the consequent waterproofing effect. This fact is also the risk factor for the using of crystalline coatings because the waterproofing effect is dependent on a consistent technological discipline.

Abstract: The lack of free areas in urban infrastructure development in the historically formed housing development in large cities and megacities promotes the growth of volumes of the realizable objects of underground construction. The design, installation, as well as quality control of waterproofing works in this case are crucial and significant stage in the construction of underground and hydraulic structures. A comprehensive approach to the analysis of the situation contributes to the selection of the correct strategy for the work execution and suitable material for waterproofing of building structures. Primary concrete protection requires the development of new effective polymer waterproofing materials. The acrylic polymer addition in concrete composition promotes corrosion resistance by 13%. Due to the composite modification penetration of corrosive medium decreased by 80%. The effectiveness of concrete modification by polymer acrylic additives is evident. This modified concrete is one of the most popular materials in the construction industry. By this criterion technology becomes progressive.

Abstract: This work deals with the determination of basic waterproofing properties of nanofiber textiles with basis weights of up to 30 g/m². Samples used in this experiment were made from nanofiber textiles based on two polymers – PVDF and PUR. Each polymer was prepared in three basis weights. All samples were not treated prior to testing. One of the key properties was the contact angle of water and the resistance to penetration of liquid water. Water-resistance of nanofiber textiles was tested according to the harmonized European standard EN 13859-1., Underlays for discontinuous roofing in pitched roof constructions are tested according to this standard. In the position of underlays there has to be some layer with low diffusion resistance of water vapor and relatively high waterproofing. We suppose such properties of nanofiber textiles. Testing of the two groups of material basis shows correlation between the contact angle and water-resistance of the nanofiber textile.

Abstract: There have been many experimental measurements of the waterproofing ability and durability of concrete with a crystalline admixture but there are uncertainties about the speed of the waterproofing effect caused by the crystalline admixture. The paper describes water pressure test carried out in different time intervals during the initial phase of cement hydration. The test results have shown that the full waterproofing effect of concrete with a crystalline admixture was available approximately on the 12th day after the concrete creation.

Abstract: In an underground R.C. Tunnel constructed as conduit for SS Pipes carrying industrial waste liquid, heavy ingress of ground water was witnessed and had to be overcome. Industrial wastes are to be carried through pipes in pipe system with an outer casing of a 200 mm dia SS pipe. Continuous contact of ground water with the casing SS pipe will deteriorate the pipe with the consequence of mixing of waste with the ground water. To avoid this, tunnel was sealed by enclosing the casing pipe with self-compacting concrete (SCC) for preventing ingress of ground water into the tunnel. As sustainability comprise Economy, Environment and social impact, the use of SCC take care the above factors by utilizing fly ash which replaces cement ,thereby, protecting the environment from industrial waste to produce socially accepted concrete and ensuring sustainable construction.