Question

(b) A soil sample from a proposed road construction in Segamat, Johor was sent to a Geotechnical Laboratory UTHM, for a compaction test. The results of compaction test obtained using modified Proctor compaction test is shown in Figure Q4 (b). 3 hi HELP ME! Predict the maximum dry density (Pmax), optimum moisture content (OMC), the dry density at 95% compaction and the range of moisture content at 95% compaction on dry side and wet side. (4 marks) Calculate the degree of saturation (Sr) and void ratio (e) at the maximum dry unit weight point of the specific gravity is 2.65. (4 marks) (iii) The sand cone replacement method was performed by a contractor and the results is depicted in Table 3. Determine the bulk density (po) and dry density (Pary)of the soil, then calculate the relative compaction (RC). (9 marks) (iv) Does the compaction in the field meet the requirement by Public Work Department of Malaysia (JKR)? Justify your answer? (2 marks) (v) If the compaction does not meet the requirement, what should the contractor do to meet the requirement? (2 marks)

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   this for sand

Answer 1

Answer ☺ 2100 2000 1900 1800 max.dry density Dry density (kg/m3) 1700 Omc Curve 1600 1500 1400 1300 20 25 5 O 15 OMC Moisture content (7.)-> Note: OMC - optimum moisture Content . from graph it is clear that the maximum dry density (Idmax) 1700kg/m 3 and optimum moisture Content = = 12% ( li ) Given data :- Maximum dry density (Sdmax) = 1700 kg/m3 Specific gravity, G= 2.65 we know, GYw Idmax) = Yo → unit weight of water Ite void ratio 1

1700 2.65% 981 Ite 3 Take, yw = 981 kg/m 0.529 we know, Srixe = G دیا See x0.529 = 0.12.x2.65 [Take w=12% Sor = where, Srd 0.6011 60.11% degree of Saturation w moisture Content we get void ratio, e = 0.529 60.11 degree of Saturation, Sr= 11% Answer Thus, we (11) Mass of Sand = 4.645 kg unit weight of Sand 1451kg/m3 volume of and 4.645 = 0.0032 m3 1451 Dory of Soil = Weight of soil rol of Sand density 3.165 0.0032 989.06 kg/m 3 Idszy 989.06 kg/m3 2.

Bulk density = Dory density (1+w) water Content water Content 3.545-3.165 3.165 xloo = 12% Bulk density (36) = 989.06 (1+12 1200 1107.74 kg/m3 Yalfield) Yd(max) Relative Compaction 11 dry density obtained in field Max-density obtained in laboratory 989.06 1700 (iv) of Malasiya for 58.18% No, the requirement of public work department Compaction is not met As per public work department of Malasia 857 to 95% of relative Compaction is requined for good compaction 3

(V) of the Compaction does not meet the requirement no. of passes of rollers must be increased to achieve higher Compaction. Secondly contractor can use various binding agents or chemicals available in market like Cement, lime etc Thinly soil which is louse can be replaced with good quality soil. 4