MASS STABILISATION MANUAL

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QUALITY CONTROL 10.2 Quality control before construction Some laboratory work is required for the in-situ quality control. Calcium quantity in stabilised soil samples is used in binder quantity measurements. For the x-ray fl uorescence equipment the calibration curves are determined and they show correlation between the calcium content of the soil and different binder quantities on soil samples prepared at the laboratory. Calibration curves should be checked by titration tests. In pre-testing, some compression strength tests may also be performed for reference purposes. Soil conditions often vary signifi cally in different spots and depths of stabilisation site and in many cases it is recommended to use more than one calibration curve in a quality control work during construction. Soil samples for the calibration curves should be collected from representative spots and at least one or two samples should extend underneath the planned stabilisation. Quality control work is also performed when a test fi eld or stabilisation tests are done before construction (see Section 9.2). Picture: Calsium content measurements with Niton XL-742S X-ray fl uorescence 40 Mass stabilisation 2005
QUALITY CONTROL Binder quantity [kg/m3] 200 180 160 140 120 100 80 60 40 20 10.3 Quality control during construction During the stabilisation process the binder contents of the stabilised layers are measured by using x-ray fl uorescence analysis equipment and calibration curves (see Chapter 10.2). Titration tests are performed as an only method for binder content analysis or they are combined with xray fl uorescence analysis for result checking purposes. If the titration results differ greatly from x-ray fl uorescence analysis results then a new calibration curve should be determined. Homogeneity and depth of stabilisation is checked from the samples taken for the laboratory and with soundings. Quality control is done by the contractor or by an independent controller. 10.4 Quality control after construction The shear strength of the mass stabilisation is examined in the fi eld by CPT or other sounding methods. Soil samples are taken from the strengthened structure and the samples are examined in the laboratory by triaxial test, penetrometer tests and by checking the binder content of the samples. And if required, the pore water pressure and ground water level are monitored. Example Calibration curve for Niton XL-742S X-ray fluorescence equipment Example Peat 1,5 m Clay 3,8 m 0 0 10000 20000 30000 40000 50000 Ca concentration [ppm] Mass stabilisation for contaminated sediments was done by dredging mud into a basin surrounded by an edge embankment. The width of the basin was about 17 m, length about 80 m and depth 4-5 m. The quality control tests were made after one month. The bearing capacity of the mass stabilised mud was measured using soundings in 9 points (total 15 tests). Vane shear testing was used in 5 tests and deep stabilisation penetration test was carried out 10 times. Mass stabilisation 2005 Mud 3,5 m Figure: Calibration curve for binder quantity determination with Niton XL-742S 41
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Page 3 and 4: CONTENTS 10. QUALITY CONTROL 38 10.
Page 5 and 6: IDEACHIP AND RAMBOLL FINLAND The AL
Page 7 and 8: IDEACHIP AND RAMBOLL FINLAND Mass s
Page 9 and 10: MASS STABILISATION 2. MASS STABILIS
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Page 19 and 20: ALLU STABILISATION SYSTEM Stabilisa
Page 21 and 22: FIELD SURVEYING 5. FIELD SURVEYING
Page 23 and 24: LABORATORY WORK 6. LABORATORY WORK
Page 25 and 26: LABORATORY WORK 6.3 Stabilisation t
Page 27 and 28: LABORATORY WORK In some cases the f
Page 29 and 30: BINDERS Ash and FGD Ash is a fi ne
Page 31 and 32: BINDERS some time, to optimize the
Page 33 and 34: DESIGNING 8. DESIGNING Note! This c
Page 35 and 36: DESIGNING In calculating the servic
Page 37 and 38: STABILISATION WORK 9. STABILISATION
Page 39: QUALITY CONTROL 10. QUALITY CONTROL
Page 43 and 44: QUALITY CONTROL 10.6 Environmental
Page 45 and 46: CASES Test mass stabilisation in su
Page 47 and 48: CASES Monitoring An extensive monit

MASS STABILISATION MANUAL

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