Sang-Keun Oh

Performance Evaluation System for Construction Environment of the Unified Waterproofing-Root Resistance Membrane layer of the Green Roof System

Installation of a proper root barrier in a green roof system is very important in order to protect the concrete slab of roof and the root penetration in the waterproofing layer. To select the proper root barrier materials and methods, it is necessary to understand the environmental conditions affecting the waterproofing-root barrier system in green roof construction site. Therefore, we suggested as the environmental performance indexes four kinds of performance requirements; root penetration, chemical attack by chemical agent or fertilizer, load impact by soil depth and size of plant, and water pressure. The related four test methods were suggested for the inspection of these performance indexes. In this research, we could suggest for kinds of test methods as standard test methods to evaluate the environmental performance of waterproofing-root barrier for greening roof system.

The Necessity Analysis of Development Waterproofing Materials and Methods of Construction Technologies for Green Roofs

The need for this study must be considerable. as being activate of green roofs research that the organization and construction obtain access to more development technologies. Nevertheless, the green roofs system has begun to apply since 1980`s, the green roofs technology was restricted to develop without verification of technologies such as a load or water leakage. There is a limit as urethane waterproofing to almost domestic waterproofing materials and methods of construction for general green roofs. The introduction of materials and methods of construction which are appropriated to property of green roofs could be a decisive factor in a long-range durability and economical maintenance cost, moreover, it support to variety construction system and organization. This present paper describes a necessity of waterproofing and root barrier system is one of the sub-organization based on green roofs construction. which have enormously large impact on the durability.

Improvement of Selection System of Waterproofing Methods for Concrete Structure

Water leakage could be caused deterioration of environmental conditions, user condition, reduction of life span and long term safety in underground concrete structure. Many materials and construction method to repair on these problems have been developed, however, it is not proper to successful repair or raise problem of increasing repair cost However, there are many limitations as practical appraisal methods due to different view of reliability for test methods. Because, it was not enough that the technical objectivity could be lack and also application of environmental condition is inadequate. In this paper, we suggest varied test methods divided to appraisal for property of matter, construction, manufacturing, specification and maintenance, friendly environmental condition. It could be more practical as a objective standard considering various angles. In summery, it should be subdivided and differentiated to accomplish proper application and to select proper materials and construction method for repair even if the synthetical condition is very complicated.

A Study on Test Methods for Performance Appraisal of Root Barrier Appling to Green Roofs

Selection of proper root barrier as destination part of greening is very important in Root penetration resistance plan. To select proper root barrier, it need to understand composition of greening part, size, kind of plant, connection with waterproofing layer. In this point of view, we have establish greening on the roof or concrete structure, not been understand the structural mechanism. It means that we misunderstood about purpose of greening and using it. So, chosen materials and construction method was not proper for greening, it caused water leakage and decrease performance of concrete structure. Therefore, we would suggest 5 items of test methods considering environmental condition for green roof. Watertightness by water of greening part, root penetration resistance test by root penetration, bacteria resistance by must or bacteria in soil, chemical resistance by rain and chemical agent of fertilizer, and load resistance by soil depth, size of plant. These suggested test methods could be referred as guideline to test in green roof system because of not exist any performance appraisal guideline or standard. Consequently, it should be analysis as technical and institutional subdividing test methods and it need to study constantly as varied angles.

Property Analysis of Waterproofing and Corrosion-Resistant Performance in Concrete Water Supply Facilities

The purpose of this study is to understand the necessity for waterproofing and corrosion-resistant technique application on concrete water tank used in water supply. Relevant research materials and regulation were collected, reviewing for the case studies of sample structures aged over 20 years, and experimental studies on chloride conduction for the high performance concrete and penetration properties of water repellency of liquid type materials. The result is that the concrete water tank in the water supply is needed for waterproofing and corrosion-resistant material coating to maintain long term durability due to the constant environmentally induced degradation deterioration often caused by chloride attack.

Analysis of the Cause of Waterleakage in Residential Apartment Underground Parking Ground and the Review of the Repare Methods

*(Received September 19, 2014 / Revised September 22, 2014 / Accepted September 22, 2014)This study analyzes the cause and the repairing method of water leak by parts of basement parking lot which is recorded to have a highdefect frequency in apartment buildings.It has been assessed that the cause of water leakage on the first floor upper substrate is due to such factors as landscaping and weights. During construction or through other cases, it has been determined that cracks were produced in the apartment structur e because the structure was weak and exposed to the effects of the substrate movement. The base floor and underground external walls are areas that are exposed to water pressure (uplife pressure), thus in normal cases the rear surface repair of the structure using sythetic rubberized polymer gel should be considered as an effective method. However, in cases where application of waterproofing layer is required in the structure due to high water pressure, using asystolic cement milk grout to form the waterproofing layer and applying water-swelling acrylic material into the cracked areas is considered to be highly effective.키워드 : 누수, 지하구조물, 누수보수, 주입공법, 방수, 양압력Keywords : A water leak, Underground Structure, Water leak repair, Injection Method, Waterproofing, Uplife Pressure* Corresponding author E-mail: jeyoung414@hanmail.net

A Study on the Evaluation of Watertightness Properties for Rain-Block System in the Sliding-Roof Joint of Large-Span Membrane Structures

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.

A Study on Waterproofing Performance Evaluation of Polyurea Resin Waterproofing Membrane Coating of Velocity per Second Hardening

There is a problem to be solved for improvement of durability and safety supervision. When you do the waterproofing work of main concrete from the design stage, the material and method of construction need to be correctly applied to appropriate circumstance conditions. Epoxy have mostly been used for concrete water tank structure. Lately, lots of subjects on adaption of polyurea resin waterproofing and anticorrosive are under discussion. Then, we attempt to approach by evaluating and comparing every capabilities with another waterproofs in this study. Performance evaluation items include the adherence performance, the imprint of seal performance, temperature dependence performance, promotion weatherizing ability, Inner chemical performance. drinking water eruptive performance. Through the experiment analysis, we found that the polyurea resin waterproofing membrane is dominantly superior to other waterproofs. According to this study, we suggest the polyurea resin waterproofing membrane as a new waterproofing material for concrete structure.

Dissolution Resistance Property of Modified Asphalt Waterproofing Sheet Coated with Polyamide Film by SEM-EDX Analysis

개량 아스팔트 방수시트 위에 폴리 우레탄 도막방수재가 도포되는 복합방수공법의 경우 시공성 향상을 위하여 도막 방수재에 유기용제를 희석해 사용하고 있지만, 유기용제가 폴리 우레탄 도막방수재의 완전 경화 전에 전부 휘발되지 못하고 시트재와 도막재 사이에 잔류하게 되고 이는 아스팔트 층을 융해시켜 방수층 손상 및 누수문제를 발생시켰다. 이에 용제에 의한 융해 문제를 개선하기 위해 내용제성이 강한 PA 필름을 개량 아스팔트 시트에 코팅(적층)하였고, 그 결과 융해에 대한 안전성을 육안을 관찰하였고, SEM 분석, EDX 분석을 통하여 PA 필름에 대한 내용제성을 정량적으로 확인하였다.

Leakage Situation and Main Leakage Areas of Domestic Residential Building Underground Parking Lots

현재 우리나라 공동주택 지하주차장의 누수 문제는 일반화되어 있는 현실이다. 실제로 우리 주변에서도 공동주택 지하주차장의 누수를 쉽게 볼 수 있을 정도로 많은 아파트 단지에서 누수가 발생 되고 있으며, 이와 같은 공동주택 지하주차장의 누수는 이제 우리 나라에서는 당연한 현실처럼 받아들여지고 있을 정도이다. 1990년대 중반까지 국내 공동주택의 주차장은 대부분 지상에 위치하고 있었으나, 1990년대 중반이후 급격한 차량 증가로 인해 지상에 주차공간이 부족한 문제가 발생하였고, 이의 해결책으로 1990년대 후반에서 2000년대 초반, 공동주택 지하부위에 지하주 차장을 건설하기 시작하였다(우리나라 자동차(자가용에 한함) 등 록대수를 살펴보면 1990년 약 300만 대에서 1995년 약 800만 대 로 2.5배 이상 급격하게 증가하였고, 2000년에는 약 1,100만대까 지 증가하기 시작하였다(통계청, http://kostat.go.kr).). 공동주택 지하부위에 주차장이 건설되기 이전인 1990년대 중 반까지 공동주택 지하부위는 대부분 기계실, 설비실, 전기실 및 창고 등의 공간으로 사용되었으며, 관리동의 하부에 한정되어 있 을 만큼 그 규모가 협소하였다. 하지만, 지하부위에 주차장이 건설 되기 시작하면서부터 지하공간의 규모가 점차 확대되기 시작하였 고, 2000년대 초중반부터는 국내 공동주택 지하주차장이 주동통 합 형태로 주를 이루기 시작하면서 단지의 규모에 따라 크게는 약 30,000m2에 달하는 지하주차장까지 건설되기 시작하였다. 공동주택의 지하공간이 기계실, 설비실, 전기실 및 창고 등의 공간으로 사용될 당시에는 지하공간 규모가 구조물의 바닥면적을 넘지 않아 대부분 구조물 외부에 방수층을 형성하는 외방수공법을 적용하였으나, 지하부위에 주차장이 건설되면서부터 지하공간의 국내 공동주택 지하주차장의 누수 실태 및 주요 누수 부위 조사 Leakage Situation and Main Leakage Areas of Domestic Residential Building Underground Parking Lots