應用輕型落重撓度儀評估冷拌再生瀝青混凝土於現地強度之研究

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黃信傑(Shin-Jie Huang) 查詢紙本館藏

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土木工程學系

論文名稱

應用輕型落重撓度儀評估冷拌再生瀝青混凝土於現地強度之研究
(Evaluate the Field Strength of Cold Recycled Asphalt Mixture Using Lightweight Deflectometer ( LWD ) in Taiwan)

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摘要(中)

隨著國內路網愈加發達，以及每年的瀝青鋪面刨鋪維修，不只衍生瀝青刨除料(Reclaimed Asphalt Pavement , RAP)無處堆放的問題，每年耗費之養護經費亦是相當可觀，為了處理RAP開發其價值，行政院內政部營建署近年大力推動冷拌再生瀝青混凝土運用於鋪面底層之各項計畫；但如何控管及有效運用有限經費於鋪面養護仍是一大考驗，為了提高養護計畫的執行效率，掌握鋪面現況是必要課程，鋪面檢測儀器的重要性不言而喻。本研究使用輕型落重撓度儀(Lightweight Deflectometer, LWD)作為鋪面強度檢測設備，使用4種壓力配置(140 kPa、220 kPa、560 kPa及905 kPa)進行現地冷拌再生瀝青混凝土底層撓度試驗，並觀測到現地冷拌再生瀝青混凝土之強度發展，本研究記錄不同厚度的現地冷拌再生瀝青混凝土鋪設完成後的強度發展與力學行為，發現LWD運用於現地冷拌再生混凝土之強度測量是可行的。同時，依據ASTM E3331規範進行實驗室內試體製作與撓度試驗，嘗試建立冷拌再生瀝青混凝土材料與含水量之關聯性。完成試驗並取得實驗數據後，本研究將進行Abaqus有限元素模型的建立並模擬現地與實驗室試驗中底層材料的受力表現，探討其不同條件下測得之鋪面底層強度是否有所差異，在完成試驗與模型模擬後，發現因軟弱層之影響，在不同壓力配置下會有高估或低估鋪面實際強度之情形，且提高壓力可以減少軟弱層對撓度評估之影響，因此，建議未來進行LWD現地撓度試驗時應使用905 kPa作為落錘壓力，模擬底層材料實際強度，且依據本研究得出之結果，此壓力下影響深度約為40 cm，亦即此壓力測到的結果可代表測試表面向下40 cm之整體強度，根據本研究結果顯示使用LWD可以觀測到冷拌再生瀝青混凝土在不同時間下的E值及其發展趨勢，本研究量測結果相對穩定且變異性較小，可以運用於未來進行鋪面加鋪及厚度設計之參數使用，本研究之結果值得於未來進行進一步之研究與探討。

摘要(英)

Effectively using and managing the limited resources for paving maintenance continues to be a major concern. The Lightweight Deflectometer (LWD) is the pavement strength testing equipment used in this study. Four pressure configurations are used in in-situ deflection tests on CRM pavement sub-layers. The study analyzes the strength evolution and mechanical behavior of finished pavement with various thicknesses while also observing the strength growth of CRM. The results show that it is possible to measure the strength of in-situ recycled asphalt concrete using LWD. In order to determine the link between the components used in CRM and moisture content, laboratory specimens are made and placed through deflection testing according with ASTM E3331 standards. This study builds an Abaqus finite element model to simulate the stress performance of sub-layer materials in both in-situ and laboratory tests once the tests conclude and the experimental data has been collected. The aim of this study is to determine whether different environmental factors affect the measured pavement sub-layer strength. The study shows that under various pressure combinations, the influence of the weak layer may cause an overestimation or underestimation of the real pavement strength. The effect of the weak layer on deflection assessment can be lessened by increasing pressure. In order to accurately represent the strength of sub-layer materials in future in-situ LWD deflection testing, it is advised to utilize 905 kPa as the hammer pressure. The results produced under this pressure can represent the total strength down to a depth of 40 cm below the test surface, based on the results of the study, which show the depth affected at this pressure is around 40 cm.

關鍵字(中)

★ LWD
★ 現地強度試驗
★ 冷拌再生瀝青混凝土
★ 有限元素法

關鍵字(英)

★ LWD
★ Field Strength Testing
★ CMA
★ Finite Element Method

論文目次

摘　要 I
ABSTRACT III
致　謝 V
目　錄 VII
圖目錄 XI
表目錄 XV
第一章、緒論 1
1-1　　研究背景與動機 1
1-2　　研究目的 2
1-3　　研究範圍 3
1-4　　研究流程 4
第二章、文獻回顧 7
2-1　　冷拌再生技術應用於鋪面底層 7
2-2　　鋪面撓度檢測技術 11
2-2-1　LWD應用於鋪面檢測 11
2-2-2　FWD應用於鋪面檢測 18
2-3　　含水量對鋪面強度之影響 20
2-3-1　鋪面水分監測 20
2-3-2　水分與彈性係數(E值) 22
2-4　　回彈模數(RESILIENT MODULUS)與彈性係數(ELASTIC MODULUS) 25
2-5　　有限元素分析法 26
2-6　　資料統計分析 28
2-7　　文獻回顧小結 30
第三章、研究方法 31
3-1　　現地強度檢測與數據收集 31
3-1-1　現地鋪設 32
3-1-2　鋪面含水量及溫度監測設備 35
3-1-3　以LWD進行現地強度試驗 37
3-1-4　工地密度試驗 39
3-2　　實驗室模擬試驗 40
3-2-1　試體製作 42
3-2-2　無圍壓縮試驗 43
3-3　　有限元素模型建立 44
第四章、試驗成果分析 47
4-1　　現地數據收集結果 48
4-1-1　材料特性 49
4-1-2　發泡再生瀝青混凝土 50
4-1-3　乳化再生瀝青混凝土 53
4-1-4　土壤(S點位) 56
4-1-5　現地環境監測結果 58
4-2　　實驗室試驗結果 62
4-2-1　發泡再生瀝青混凝土 62
4-2-2　乳化再生瀝青混凝土 63
4-2-3　土壤材料 64
4-2-4　建立關係式 65
4-3　　小結 67
第五章、模型建立成果 69
5-1　　模擬現地模型 70
5-1-1　現地20 cm底層模型 73
5-1-2　現地40 cm底層模型 78
5-1-3　現地土壤底層模型 83
5-2　　模擬實驗室試體模型 87
5-3　　小結 92
第六章、結論與建議 93
6-1　　結論 93
6-2　　建議 95
參考文獻 97

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指導教授

陳世晃(Shih-Huang Chen)

審核日期

2023-7-28

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