United States Department of Transportation
i
Application of Microbial Induced Calcite Precipitation to Stabilize Florida High-Organic Matter Soils for Roadway Construction [Research Brief]
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2019-06-01
[PDF-414.77 KB]
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Abstract:Florida is well known for its lush greenery. This abundant plant life results in soils that are rich in organic matter. That’s good in a garden, but not as good for carrying roads. Decay of organic material in soils makes the soils more compressible and, thus, poorer as foundations for structures like roads. The decomposition of the organic matter can create underlying soils with a very large void composition, resulting in large settlements under the road that cause depressions and cracking in the road surface. The greater the percentage of organic material in soil, the greater the potential problem. Soils that are high in organic matter can be stabilized by the addition of calcium-containing materials like lime or cement. One method of doing this involves causing the mineral calcite (calcium carbonate) to form through chemical reactions in the soil to bond particles together and strengthen the soil.
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