焚化再生粒料在過濕土壤的室內與現場試驗加速減水的成效研究

根據ASTM對於改良夯實試驗規定，須將土壤氣乾後打碎過4號篩。然而在現場施工時，面對過濕土壤，施工方往往無足夠的工期可依照實驗室作法進行氣乾、打碎、過篩，因此透過焚化再生粒料多孔洞及高比表面積的特性，在與過濕黏土進行拌和後，具有減水效果，以提高現地乾密度，達到規範所要求之夯實度。本研究可分為兩部分，第一部分為室內由濕至乾的試驗備製執行夯實試驗（本文簡稱反向夯實試驗）之可行性及成效，第二部分為現地施工階段減水效果。兩部分皆以桃園市三處示範工程為研究對象，在第一部分中，三種混拌料取的方式，包括傳統氣乾方法、不氣乾、不打碎過篩，於室內直接混拌料、現地混拌料。以室內試驗結果相互比對，目的在於探討反向夯實試驗的可行性，以及室內混拌料作為模擬現地混拌料的可行性。而第二部分探討在拌和作業、養治及滾壓作業下，含水量變化的比較與加速減水的成效評估。由試驗結果得知，以常態含水量狀況的焚化再生粒料不氣乾過篩，直接與過濕黏土拌和進行反向改良夯實試驗，其最佳含水量與最大乾密度具有一致性。且夯實曲線線型相似，可判斷不氣乾、過篩方式是可行的。其後，精準配比的室內混拌料之最大乾密度、最佳含水量也與現地混拌料試驗結果差異皆在2%內，證明可以室內拌和方式模擬現地施工狀況。而現地施工含水量變化，透過比較農耕機拌和時間、養治天數、滾壓作業，對於含水量的變化，可發現透過石灰活化焚化再生粒料加速陽離子交換及水化反應下，以及焚化再生粒料的多孔洞特性，使含水量不斷下降，並提升乾密度。

關鍵字

焚化再生粒料；過濕土壤；減水效果；夯實試驗

並列摘要

According to ASTM regulations for Laboratory Compaction Characteristics of Soil Using Modified Effort, the soil must be air-dried and then passing through a No. 4 Sieved. However, during on-site construction, in the face of excessively wet soil, engineers often does not have enough time to air dry, smashing, and passing sieve No.4. Therefore, through the multiple holes of incinerated recycle aggregates and specific surface area characteristics, after being mixed with the over-wet clay, it has the water-reducing effect to increase the on-site dry density and achieve the degree of compaction. This research can be divided into two parts. First, the first part is the feasibility and effectiveness of the implementation of the compaction test from wet to dry indoor test preparation, which is called the wet to dry compaction test in this essay, and the second part is the water reduction effect during the in-situ construction phase. Both parts take three demonstration projects in Taoyuan City as the research objects. In the first part, there are three ways of mixing materials, including the traditional air-drying method, mixing the wet clay and Incinerated Recycle Aggregates in the lab without air dry and passing sieve No.4, and the mixture from in-situ. The test results are compared with each other, and the purpose is to explore the feasibility of the reverse compaction test and the feasibility of the indoor mixture as a simulated in-situ mixture. The second part discusses the comparison of water content changes and the evaluation of the effectiveness of accelerated water reduction under mixing operations, curing, and rolling operations. It is known from the test results that the Incineration Recycle Aggregates without air dry and passing sieve No.4 are directly mixed with over-wet clay for reverse improvement tamping test, and the Optimum Moisture Content (OMC) is consistent with the maximum dry density. And the compaction curve is similar, it can be judged that the non-air drying and sieving method is feasible. Afterward, the difference between the maximum dry density and optimal moisture content of the accurately proportioned indoor mixture and the in-situ mixing test results are all within 2%, which proves that the indoor mixing method can simulate in-situ construction conditions. The changes in the water content of the site construction, by comparing the mixing time, curing days, and rolling operation of the farmer, it can be found that the Incineration Recycle Aggregates activated by lime can accelerate the cation exchange and hydration reaction, plus the porous characteristics of the Incineration Recycle Aggregates. Make the water content drop continuously and increase the dry density