Knowing that the work you are going to work on has indicated a minimum degree of compaction of 90%, that the humidity range specified from the compaction curve was between 10.5% and 11.5% and that the results of the sand bottle and Speedy test presented below were obtained, answer if the compaction is adequate Soil moisture content obtained by Speedy: 11.2% Mass of the flask + sand + cone before the test = 7,090 g Mass of the bottle + sand + cone after the test = 4,700 g Calibrated mass of sand in the cone = 450 g Calibrated dry specific mass of sand = 1.570 g/cm3 Mass of wet soil removed from the hole = 3000 g Maximum dry apparent specific mass of the soil in the laboratory = 2,200 g/cm
12. Soil compaction is important information to be controlled during
the execution of geotechnical works. An example of problems caused by poor compaction of materials are permanent deformations such as those observed in the existing pavement between Corumbá and the ports of Santos (SP) and illustrated in Figure 1. In an article published on 02/03/2022 in the newspaper Correio do Estado (https://correiodoestado.com.br/cidades/excesso-de-peso-faz-da-br262-uma-rodovia-de-alto-risco/397089) states that "in this region, the base of the landfill is fragile due to account of the inappropriate material used when building the road in the 1980s. Inadequate compaction also caused erosion problems (Figure 2) on the wall built by the United States on the border with Mexico, as published on the official website of the United States Homeland Security at 01/30/2021 (https://www.dhs.gov/news/2021/04/30/dhs-
announces-steps-protect-border-communities-wall-construction).
Figure 1. Surface sinking occurs due to insufficient compaction of pavement layers - Silvio Andrade
Figure 2. Erosions along the boundary wall between
Mexico and United States
Knowing that the work you are going to work on has indicated a minimum degree of compaction of 90%, that the humidity range specified from the compaction curve was between 10.5% and
11.5% and that the results of the sand bottle and Speedy test presented below were obtained, answer if the compaction is adequate
Soil moisture content obtained by Speedy: 11.2%
Mass of the flask + sand + cone before the test = 7,090 g
Mass of the bottle + sand + cone after the test = 4,700 g
Calibrated mass of sand in the cone = 450 g
Calibrated dry specific mass of sand = 1.570 g/cm3
Mass of wet soil removed from the hole = 3000 g
Maximum dry apparent specific mass of the soil in the laboratory = 2,200 g/cm
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