本研究以泥岩當做再生材料觀念為基準，搭配不同砂土含量的複合土壤為研究對象；探討不同重量比例的複合土壤之回脹特性與在大地工程中的路基工程影響。文中泥岩採用田寮月世界泥岩過標準篩40號的風化泥岩，砂則是取過標準篩4號的屏東里港大橋下的里港砂。將此兩種材料依照預定的重量比混合成不同土壤，然後在試驗室內進行標準夯實試驗、自由回脹試驗、限制應變回脹應力試驗、加州載重比試驗。

經本研究的回脹試驗與加州載重比試驗，其回脹試驗結果顯示砂含量大概在40 % 以上有效降低回脹量，而在最佳含水量下的貫入強度來看，40 %含砂量為強度尖峰值。

The idea of this study came from the concept of recycling mudstone. The study is to mix the mudstone with different sand contents, to explore the swell property of the composite soil in different weight ratio of sand contents. The weathered mudstone, which passed U.S. No. 40 standard sieve is sampled from the Moon World at Tienliao village in Kaohsiung county. The sand is sampled from Ligang Bridge. All the sand samples passed U.S. No. 4 standard sieve. The test procedures are to mix these two materials with the preset weight firstly, and standard compaction test, free swelling test, constraining strain swelling stress test, CBR(California Bearing Ratio) were preformed in laboratory, respectively.
The results show that, adding sand above 40 percent is the optimum sand content, it can effectively reduce the swelling, add penetration strength in optimum moisture content. Adding sand 40 percent will reach the maximum strength of the specimen.

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