| 種別 | paper |
| 主題 | Strength Properties of Polymethyl Methacrylate Mortars Placed and Bonded Underwater |
| 副題 | |
| 筆頭著者 | M.Amamer Rafique BHUTTA（graduate school Nihon university） |
| 連名者1 | Yoshiro OHAMA（Nihon university） |
| 連名者2 | Katsunori DEMURA（Nihon university） |
| 連名者3 | |
| 連名者4 | |
| 連名者5 | |
| キーワード | |
| 巻 | 15 |
| 号 | 1 |
| 先頭ページ | 1235 |
| 末尾ページ | 1240 |
| 年度 | 1993 |
| 要旨 | INTRODUCTOIN Recently, polymethyl methacrylate (PMMA) mortars have been developed, and widely used as construction materials throughout the wor1d because of their good workability, low-temperature curability, high-early-strength development, water tightness, chemical resistance and abrasion resistance. The possibilities of the underwater applications of PMMA mortars have already examined [1]. In general, reinforced concrete structures such as offshore platforms, breakwaters, jetties, harbor walls, harbor and coastal buildings and other structures in or adjacent to seawater are always severe marine environment, and are apt to suffer chloride-induced damage. Therefore, the effective materials which can use in seawater are required to protect, such concrete structures and to repair such damage. PMMA mortars can be considered as such effective protective and repair materials. In this Paper, PMMA mortars with the silane coupling agent added to their binders or the sands treated with it are prepared, placed or bonded to PMMA mortar substrates in artificial seawater, tap water and air, and tested for strength and adhesion. Development in their compressive strength, flexural strength and adhesion in flexure are examined underwater. CONCLUSIONS (1) The working life of PMMA mortars placed in Seawater and tap water can be controlled like that of PMMA mortars Placed in air. (2) PMMA mortars placed underwater develop about 80% or higher of 672-hour (28-day) flexural and compressive strengths, and adhesion in flexure to PMMA mortar substrates at curing periods of 3 to 6 hours regardless of placing conditions. (3) The flexural and compressive strengths, and adhesion in flexure of PMMA mortars Placed and bonded in Seawater tap water develop 60 to 90% of those of PMMA mortars Placed and bonded in air. (4) The developments of the flexural and compressive strengths, and adhesion in flexure of PMMA mortars (to PMMA mortar substrates) are remarkable in their placement or bonding in Seawater rather than in tap water. This trend is also marked in PMMA mortars with Silane-treated sands. (5) For the purpose of improving the strength and adhesion of PMMA mortars placed or bonded in Seawater and tap water, the use of the sends treated with Silane rather than Silane addition to the binders can be recommended. |
| PDFファイル名 | 015-01-1210.pdf |