Use of DCP (Dynamic Cone Penetrometer) and LWD (Light Weight Deflectometer) for QC/QA on Subgrade and Aggregate Base

2009 ◽  
Author(s):  
K. Kessler
Keyword(s):  
Cone Penetrometer ◽  
Light Weight ◽  
Dynamic Cone Penetrometer ◽  
Light Weight Deflectometer ◽  
Aggregate Base

Assessment of in Situ Structural Properties of Lime-Stabilized Clay Subgrades

1996 ◽  
Vol 1546 (1) ◽  
pp. 13-23 ◽  
Author(s):  
Dallas N. Little
Keyword(s):  
Structural Properties ◽  
Previous Literature ◽  
Cone Penetrometer ◽  
Department Of Transportation ◽  
Lime Stabilization ◽  
Dynamic Cone Penetrometer ◽  
Texas Department ◽  
Aggregate Base ◽  
Falling Weight

Lime-stabilized clay subgrades are used almost routinely in Texas to facilitate construction and to provide a foundation for aggregate base courses and hot mix surfaces. Research sponsored by the Texas Department of Transportation demonstrates that the in situ moduli and strength improvements afforded by lime stabilization of these layers are often significant and deserve structural consideration. A study of the range of modulus values determined from falling weight deflec-tometer deflection data and supported by in situ dynamic cone penetrometer data for 40 pavement subgrades indicates that the lime-stabilized subgrades provide a level of stiffness and strength that is similar to that of an unbounded aggregate base. This substantiates previous literature suggesting that properly designed and constructed lime-stabilized subgrades should be assigned AASHTO structural coefficients in the same range as unbound aggregate bases, that is, between 0.10 and 0.14.

Field investigation of shallow soft-soil highway subgrade treated by mass carbonation technology

2021 ◽  
Vol 58 (1) ◽  
pp. 97-113
Author(s):  
Song-Yu Liu ◽  
Guang-Hua Cai ◽  
Guang-Yin Du ◽  
Liang Wang ◽  
Jiang-Shan Li ◽  
...  
Keyword(s):  
Soft Soil ◽  
Field Tests ◽  
Field Investigation ◽  
Field Application ◽  
Cone Penetrometer ◽  
Soil Layers ◽  
Dynamic Cone Penetrometer ◽  
Weak Soils ◽  
Light Weight Deflectometer ◽  
Temperature Dynamic

The innovative carbonation technique based on reactive MgO and CO2 has been identified as an environmentally friendly and efficient method in the improvement of weak soils. Previous laboratory studies have indicated that carbonated MgO-admixed soils had significant improvement in mechanical properties. However, there are to date limited investigations on the soft-soil field application of this technique. In this study, a field trial was conducted to ascertain the feasibility of the MgO mass carbonation technique in improving shallow soft-soil subgrades. A series of field tests, including temperature, dynamic cone penetrometer, and light-weight deflectometer tests, were undertaken. The results indicated that compared with uncarbonated soil layers, there was two to three times increase in dynamic resilient moduli and soil resistances of carbonated MgO-admixed soils. The outcomes of this field investigation will contribute to the utilization of the combined stabilizer of MgO and CO2 and the mass carbonation technology in subgrade improvement.

scholarly journals PENGUJIAN DAYA DUKUNG LAPIS TANAH DASAR (SUBGRADE) PADA TANAH TIMBUNAN UNTUK LAPISAN JALAN DENGAN ALAT DCP (DYNAMIC CONE PENETROMETER)

2015 ◽  
Vol 17 (1) ◽  
Author(s):  
Tatang Sumarna
Keyword(s):  
Cone Penetrometer ◽  
Dynamic Cone Penetrometer

Jalan merupakan prasarana transportasi yang paling banyak digunakan oleh masyarakat Indonesia untuk melakukan mobilitas keseharian sehingga volume kendaraan yang melewati suatu ruas jalan mempengaruhi kapasitas dan kemampuan dukungnya. Kekuatan dan keawetan kontruksi perkerasan jalan sangat ditentukan oleh sifat-sifat daya dukung tanah dasar. Pengujian dilakukan dengan Calfornia Bearing Ratio (CBR) rendaman untuk bahan tanah timbunan, dan dengan Dynamic Cone Penetrometer (DCP) untuk prototipe subgrade jalan. Nilai CBR akan berbeda-beda sesuai dengan kedalaman lapisan yang diuji. Pada kedalaman 0-340 mm, 340-590 mm dan kedalaman 590-950 mm berturut-turut diperoleh nilai CBR rata-rata sebesar 7.62%, 19.67% dan 21.90%, lebih besar dari nilai CBR rencana yaitu 5.7%. Hal ini berarti subgrade memenuhi syarat kekuatan.

scholarly journals Strength Tests on Newly Fallen Snow

1969 ◽  
Vol 8 (54) ◽  
pp. 427-440 ◽  
Author(s):  
R. Perla
Keyword(s):  
Cone Penetrometer ◽  
Light Weight ◽  
Large Drop ◽  
Torque Wrench ◽  
Strength Tests ◽  
Order Of Magnitude ◽  
Magnitude Variation ◽  
A New Technique ◽  
Shear Frame

AbstractModified versions ofin situstrength tests previously applied to metamorphosed snow were developed to measure the mechanical properties of newly fallen snow during storm periods. A large drop-cone penetrometer, protected from the wind by an aluminum shell, was used to determine snow “hardness”. A lightweight model of the Haefeli ram penetrometer measured “ram numbers”. Shear strengths were obtained from large, light-weight frames. Some preliminary tests were made with a shear vane driven by a torque wrench. A new technique was devised for measuring tensile strength whereby a cantilever beam of snow is undercut until it fails under its own weight. Comparisons between the cantilever test and the shear-frame test show high ratios for tensile to shear strength. Cantilever strength plotted against density shows an order of magnitude variation in strength at all densities.

Sign in / Sign up

Export Citation Format

Share Document