Watertightness Performance Research Articles

개폐식 대공간 막 구조물에서 지붕 맞댐부 우수차단 시스템의 수밀성 평가에 관한 연구

지붕 개폐형태의 대공간 막 구조물은 멀티미디어적인 요소 및 전천후 공간을 활용할 수 있지만, 다수의 연결 조인트에 의해 구조물이 형성되므로 누수에 취약한 문제점이 있다. 특히 개폐식 지붕 맞댐부위의 우수차단 시스템은 우수의 직접적인 유입을 차단하는 역할을 하고 있으므로 바람을 동반한 강우환경에서도 수밀성능이 요구된다. 따라서 상기의 환경 조건을 부여한 수밀성 실험을 통하여 우수차단 시스템의 디테일에 대한 수밀성능을 평가하고자 한다. 실험 결과, 모든 실험체에서 누수가 발생하였으며, 우수의 유입경로는 동일한 것으로 확인되었다. 특히, 바람에 의하여 물입자들이 구조물 내부로 들이치는 현상이 주원인이므로 이를 보완한 새로운 우수차단 시스템의 디테일이 요구된다. 이 연구를 통해 강우 환경과 바람 환경을 동시에 부여하였을 때 발생될 수 있는 우수 침입 경로를 확인하였으며, 수밀 성능 확보 유무가 사전에 검토되어 져야함을 알 수 있었다. 또한, 디테일을 사전에 작성하여 모형 수밀성 시험을 반드시 시행한 후 그 결과에 따라 설계 디테일의 변경, 개선, 보완시공을 하여야 할 것이다. This study is an evaluation of the water-tightness properties of rain-block systems in the sliding-roof joint of large-span membrane structures. In this study, we suggested a method of evaluating the water-tightness performance of the joint part of a sliding door in the roof of a large-span membrane structure (for a pilot project), in an environment of rain and wind. The shape of the rainwater blocking systems of the joint part in a sliding door verifies the defects and the effects of water leakage prevention when there is precipitation with wind conditions. To secure the water-tightness of large span membrane structures, it is necessary to have a guideline on the evaluation of the design for rain-block system of the joint part, and the quality of the membrane material, both of a retractable roof and a closed roof.

Proposed method for calculating water penetration test parameters of wall assemblies as applied to Istanbul, Turkey

Water penetration of a building envelope assembly is typically assessed on the basis of the degree of watertightness (i.e. lack of water ingress) of the components of the assembly when subjected to simulated driving rain conditions. Test standards provide the magnitude and extent of these test conditions as suggested by the test parameters, i.e. the water spray rates and pressure differences and the dwell time over which these are to be applied. Such conditions would presume to simulate driving rain and wind conditions of locations spread over a broad geographical area. For example, the water spray rate suggested for use in watertightness performance tests in EN 12155—Curtain walling–watertightness–laboratory test under static pressure—is considered appropriate for simulating driving rain and wind conditions for locations across Europe. However, test parameters should be based on the expected driving rain intensities and wind pressures that are likely to occur for a specific climate and a given return period. It might also be based on the building type (e.g. high or low-rise building), or even on the location on the building facade. Hence, a method is required for calculating water penetration test parameters for specific buildings located in a specific climate. The purpose of this paper is to propose a method for calculating water penetration test parameters. A survey of existing methods is first provided that focuses on the quantification of driving rain on buildings and thereafter, calculation of water penetration test parameters. The merits and drawbacks of these methods are then discussed. Based on this review, a method for calculating test parameters is proposed and is applied to developing water penetration test parameters for Istanbul, Turkey. A comparison of test parameters calculated from the proposed method with those given in existing Turkish standards TS EN 12155–Curtain walling–watertightness–laboratory test under static pressure—and TS ENV 13050—Curtain walling–watertightness–laboratory test under dynamic condition of air pressure and water spray—related to Istanbul, indicated that the water spray rate given in the TS standards is higher than spray rates calculated from the proposed method for return periods of 5, 10 and 30 years.

Watertight Performance and Durability of Developed Joint Repair Method of Concrete Canal

Watertight Performance and Durability of Developed Joint Repair Method of Concrete Canal

A Review of Climate Loads Relevant to Assessing the Watertightness Performance of Walls, Windows, and Wall-Window Interfaces

Abstract When assessing a wall assembly's ability to manage rainwater and control rain penetration, the two key climatic elements to consider are wind speed and rainfall intensity. However, of significance to rain penetration is the effect of wind-driven rain on the building cladding — that is wind coincident with rainfall. When water is present at openings in the cladding, water is driven into the layers of the assembly by the action of wind. Paths providing a direct line from openings in the cladding to inside the assembly offer particularly vulnerable points for water entry. Performance testing helps determine the location of vulnerable locations in a wall assembly and the test loads at which penetration occurs, and it possibly relates the amount of entry to specific details and simulated climate effects. Undertaking watertightness performance tests requires knowledge of extremes in wind-driven rain or specifically the occurrence and level of extreme rainfall events for locations of interest. A review of climate information on wind-driven rain is provided, and its relevance to assessing the watertightness performance of walls, windows, and wall-window interfaces is discussed. Values of rainfall intensity, duration, and frequency or occurrence are given, emphasizing the level of significance of these variables to different North American climates.

Strength and Watertight Performance of Expanded Steel Pipe Joint

Strength and Watertight Performance of Expanded Steel Pipe Joint

EIFS Sealant Joint Restoration

Abstract The successful performance of exterior insulation and finish systems (EIFS) is related directly to the sealants used to weatherseal the EIFS and adjacent materials to EIFS. With millions of square feet of EIFS installed, proper restoration of EIFS joints can help ensure long-term watertight performance of the EIFS wall. A new test method that closely parallels ASTM C 1135—Test Method for Determining Tensile Adhesion Properties of Structural Sealants, is currently under consideration by ASTM Task Group C 24.20.12. This new test method allows sealant joints to be evaluated in many conditions to more closely simulate actual field conditions. This paper will focus on types of EIFS joint failure and possible causes for failure. Different restoration methods will be discussed with particular attention to the use of sealants to overlay failed sealant joints. A modification to the test method under review by ASTM Task Group C 24.20.12 will be used to evaluate various joint conditions with EIFS, including standard square joints, hourglassshaped joints, overlay joints with wet sealants, and overlay joints with performed sealants.