geotechlab4 - Table of Contents Introduction 2 Equipment 2...

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Table of Contents Table of Figures Figure 1 – Cylindrical Mold ……………………………………………………………..3 Figure 2 – Metal Rammer ……………………………………………………………….3 Figure 3 – Compaction Analysis Results ……………………………………………….6 Figure 4 – Compaction Analysis Plot …………………………………………………...6 Figure 5 – Results of Visual-Manual Soil Classification ………………………………7
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Introduction Laboratory compaction tests are used to determine the relation between water content and dry unit weight and to find the maximum dry unit weight and optimum water content. 1 The compaction test preformed in this experiment was a standard proctor test producing six points of the soil compaction curve to ensure a fully representative range of data. The optimal dry unit weight is a particularly important property because it is highly correlated with many desirable engineering properties such as, strength, compressibility, hydraulic conductivity, void ratio, and erosion resistance properties 2 . Although it is always advised to perform routine sieve, hydrometer, and Atterberg limits tests, it is not always cost-effective 3 . That is why a visual-manual soil classification was also performed on nine additional soil samples. Equipment The equipment used in this compaction test included: Cylindrical metal mold, internal dimension 105 mm in diameter and 115 mm high (volume 1000 cm 3 ). The mold is fitted with a detachable base plate and a removable extension collar (Figure 1). Metal rammer with 50-mm-diameter face, weighing 24.4 kN, sliding freely in a tube that controls the height of drop to 300 mm (Figure 2). Extractor apparatus for removing compacted material from the mold. Trowel. Steel straightedge. No. 4 sieve. Balance. Drying oven. Ruler and vernier calipers.
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