| URN | etd-0730124-171650 | Statistics | This thesis had been viewed 59 times. Download 0 times. |
| Author | Cheng-xiang Jiang | ||
| Author's Email Address | No Public. | ||
| Department | Department of construction & spatial design | ||
| Year | 2023 | Semester | 2 |
| Degree | Master | Type of Document | Master's Thesis |
| Language | zh-TW.Big5 Chinese | Page Count | 53 |
| Title | Study on Compressive Stress of Controlled Low Strength Materials with Sludge |
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| Abstract | Taiwan's small size and dense population result in numerous construction units for pipeline projects. After pipeline installation, backfilling is typically done using local soil or graded sand and gravel. However, with the development of urban areas, pipeline construction has become increasingly frequent. Despite this, construction times are further compressed due to traffic considerations. Additionally, the small construction area for pipelines makes proper compaction difficult, and obtaining well-graded backfill materials and sources is challenging. As a result, road surface subsidence is often observed after some time, affecting urban aesthetics and traffic safety. To address these construction challenges encountered in pipeline backfilling, a "Controlled Low Strength Material (CLSM)" suitable for Taiwan's conditions was developed, drawing reference from the guidelines of ACI 229 R from the United States. Initially, the material needed to have high fluidity and set within a day to allow for immediate ii pedestrian and vehicular passage, while its 28-day strength should not be excessively high to facilitate future pipeline maintenance. This study involved mixing different proportions of water, cement, sludge, fly ash, incineration bottom ash, and aggregates, measuring slump flow, and producing cylindrical specimens for compressive strength tests at 7 and 28 days. The experiment yielded the following results: After drying, the sludge was mixed, maintaining a fixed moisture content. The mixing water was relatively reduced, resulting in a slump flow between 41-45 cm. The sludge particles were not easily softened, and the water-to-solid ratio was controlled between 0.21 to 0.28. The compressive strength at 28 days also increased to meet the specified value. Moreover, the strength of dry curing is greater than that of wet curing. |
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| Files | indicate in-campus access immediately and off-campus access at 5 years | ||
| Date of Defense | 2024-07-16 | Date of Submission | 2024-07-31 |