A sand cone test was conducted for quality control during the compaction of sandy clay. The data are as follows : Calibration to find dry unit weight of the standard sand Mass of Proctor mold 4178 grams Mass of Proctor mold and sand 5609 grams Volume of mold 0.00095 m Calibration of sand cone Mass of sand cone apparatus and jar filled with sand 5466 grams Mass of sand cone apparatus with remaining sand in jar 3755 grams Sand cone test results Mass of sand cone apparatus and jar filled with sand 7387 grams Mass of excavated soil 2206 grams Mass of sand cone apparatus with remaining sand in jar 3919 grams Water content of excavated soil 9.2% 1. Determine the dry unit weight. 2. The standard Proctor maximum dry unit weight of the sandy clay is 17.8 kN/m at an optimum water content of 10%. The specification requires 95% Proctor dry unit weight at acceptable water contents ranging from 9% to 10.8%. Is the specification met? Justify vour answer.

A sand cone test was conducted for quality control during the compaction of sandy clay. The data are as follows : Calibration to find dry unit weight of the standard sand Mass of Proctor mold 4178 grams Mass of Proctor mold and sand 5609 grams Volume of mold 0.00095 m Calibration of sand cone Mass of sand cone apparatus and jar filled with sand 5466 grams Mass of sand cone apparatus with remaining sand in jar 3755 grams Sand cone test results Mass of sand cone apparatus and jar filled with sand 7387 grams Mass of excavated soil 2206 grams Mass of sand cone apparatus with remaining sand in jar 3919 grams Water content of excavated soil 9.2% 1. Determine the dry unit weight. 2. The standard Proctor maximum dry unit weight of the sandy clay is 17.8 kN/m at an optimum water content of 10%. The specification requires 95% Proctor dry unit weight at acceptable water contents ranging from 9% to 10.8%. Is the specification met? Justify vour answer.

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter17: Subsoil Exploration

Section: Chapter Questions

Problem 17.2P

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As part of a quality controlprogram, the field inspection engineer conducted a sand cone test to determine the field density. The following data were recorded using the sand cone method. • Calibrated dry density of Ottawa sand = 1667 ??/?3• Mass of Ottawa sand to fill the cone = 0.117 kg• Mass of jar + cone + sand (before use) = 6.1 kg• Mass of jar + cone + sand (after use) = 2.83 kg• Mass of moist soil from hole = 3.35 kg• Moisture content of moist soil = 16.1%a. Determine the dry unit weight of compaction in the field. (ANS: 14.97kn/m3) PLS ANSWER NUMBER 2 WITH COMPLETE SOLUTION 2. What is the relative compaction in the field if the maximum dry unit weight in the laboratory is 15.93 ??/?3?
A sand cone in place unit test was conducted on the field during the construction of the embanklment in CALAX. The following data were obtained in the field: Moisture content of soil from the test hole+ 12.8% ; Weight of sand to fill the funnel(cone) = 320g; Weight of weight soil from the test hole= 750g; Unit weight of sand= 15.4 kN/m3 and Weight of sand used to fill the test hole and thefunnel of sand-cone device=870 g. Compute for the relative compaction (in percent) in the field if the maximum dry unit weight of the soil is 21.30 kN/m3. a. 94 b. 90 c. 88 d. 92
A sand cone in place unit test was conducted on the field during the construction of the embanklment in CALAX. The following data were obtained in the field: Moisture content of soil from the test hole+ 12.8% ; Weight of sand to fill the funnel(cone) = 320g; Weight of weight soil from the test hole= 750g; Unit weight of sand= 15.4 kN/m3 and Weight of sand used to fill the test hole and thefunnel of sand-cone device=870 g. Compute for the relative compaction (in percent) in the field if the maximum dry unit weight of the soil is 21.30 kN/m3.
A sand cone in place unit test was conducted on the field during the construction of the embanklment in CALAX. The following data were obtained in the field: Moisture content of soil from the test hole+ 12.8% ; Weight of sand to fill the funnel(cone) = 320g; Weight of weight soil from the test hole= 750g; Unit weight of sand= 15.4 kN/m3 and Weight of sand used to fill the test hole and thefunnel of sand-cone device=870 g. Compute for the relative compaction (in percent) in the field if the maximum dry unit weight of the soil is 21.30 kN/m3. a.94 b.88 c.92 d.90 With FBD if necessary
A sand-cone in place unit test was conducted on the field during the construction of a proposed embankment. The following data were obtained. moisture content=12.8% weight of sand to fill the funnel=320 g weight of wet soil from test hole=750 g unit weight of sand=15.4 kN/m3 weight of sand used to fill test hole and funnel of sand-cone device=870 g a) compute the wet unit weight of soil (Ans. 21.14 kN/m3) b) compute the dry unit weight of the compacted soil (Ans. 18.74 kN/m3) c) compute the relative compaction in the field if the maximum dry unit weight of the soil is 21.3 kN/m3. (Ans. 87.98%)
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You are checking a field-compacted layer of soil. The laboratory control curve has the following values: gd (kN/m3) w (%) 16.34 14 16.57 16 16.65 18 16.50 20 16.26 22 15.87 24 The specification for compaction states that the field-compacted soil must be at least 95% of the maximum control density and within of the optimum moisture for the control curve. You dig a hole 1m3 in the compacted layer and extract a sample that weighs 17.2 kN wet and 14.1 kN dry. (a) What is the compacted gd? The compaction w? The percent compaction? Does the sample meet the specifications? (b) If the specific gravity is 2.68, what is the compacted degree of saturation? If the sample were saturated at constant density, what would be the water content?
arrow_forward Question A fine-grained soil has 60% clay with LL 220%, PL 545%, and a natural water content of 6%. A standard Proctor test was carried out in the laboratory and the following data were recorded Diameter of mold = 101.40 mmHeight of mold = 116.70 mmMass of mold = 4196.50 gramSpecific gravity, Gs = 2.69 a) Determine the maximum dry unit weight and optimum water content.b) If the desired compaction in the field is 95% of the standard Proctor test results, what values of dry unit weight and water content would you specify?c) Explain why you select these values.d) What field equipment would you specify to compact the soil in the field, and why?e) How would you check that the specified dry unit weight and water content are achieved in the field? I Need The Answer of part (d) and (e)...