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首页> 美国政府科技报告 >Increasing the Effectiveness of Soil Compaction at Below-Freezing Temperatures.
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Increasing the Effectiveness of Soil Compaction at Below-Freezing Temperatures.

机译：提高低于冰点温度的土壤压实效果。

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This report presents data from an experimental program undertaken to determine the effect of low temperatures on the compaction characteristics of a silty sand. The effects of compactive effort and chemical additives were also investigated to determine possible methods of improving the densities of soils placed and compacted at low temperatures. A single soil type was used throughout the test program and test results were obtained using Standard and Modified AASHO compactive efforts on an untreated soil prepared and tested at temperatures of 20C and -7C. Additional test series, using the same compactive efforts and temperatures, were performed on the soil after it had been treated with an additive. The amounts of additive used, based on the dry weight of soil, were 3, 2, 1, 0.5, and 0.25% of calcium chloride and 0.5% of sodium chloride. From the results of the experimental program, several important conclusions concerning the effect of low temperature compaction were drawn: (a) For similar test conditions, the dry unit weight of a frozen compacted soil is less than for an unfrozen compacted soil. (b) The dry unit weight of a frozen soil is inversely proportional to the amount of ice in the soil pore space. (c) Chemical additives can be effectively used to offset the adverse effect of low temperature on the compaction characteristics of a soil. (d) The effect of chemical addivites on the compaction characteristics of a soil compacted at temperatures below 0C can be predicted using phase equilibrium concepts from physical chemistry.

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