The regular study of dry density for shear strength parameters of loess

2014 ◽  
pp. 401-404
Keyword(s):  
Shear Strength ◽  
Dry Density ◽  
Shear Strength Parameters ◽  
Strength Parameters

scholarly journals Influence of Zeolite on the Compaction Characteristics and Shear Strength Parameters of Cemented Sand

2021 ◽  
Vol 50 (11) ◽  
pp. 3181-3191
Author(s):  
Ghasem Norouznejad ◽  
Issa Shooshpasha ◽  
Seyed Mohammad Mirhosseini ◽  
Mobin Afzalirad
Keyword(s):  
Shear Strength ◽  
Soil Stabilization ◽  
Dry Weight ◽  
Dry Density ◽  
Shear Strength Parameters ◽  
Strength Parameters ◽  
Maximum Dry Density ◽  
Cemented Sand ◽  
Direct Shear Tests ◽  
Calcium Silicate Hydrates

It is well known that in geotechnical engineering, soil stabilization using cement is one of the appropriate approaches for enhancing soil characteristics. With respect to zeolite, its impact on the characteristics of cemented soil has not been fully evaluated. Thus, in the current research, a set of laboratory tests including standard Proctor compaction and direct shear tests (DSTs) considering four cement contents (2, 4, 6, and 8% of sand dry weight) and four zeolite contents (0%, 30%, 60%, and 90% of cement percentage as a replacement material) was carried out. The results indicated that the zeolite reduced Maximum Dry Density (MDD) while it increased value of Optimum Moisture Content (OMC) of cemented sand. Through the DSTs, it has been found that the replacement of cement by zeolite up to 30%, leads to the highest values of shear strength parameters due to the occurrence of pozzolanic and chemical reactions, particularly the production of higher amounts of calcium aluminate and calcium silicate hydrates in comparison with zeolite-free samples.

Model Tests on the Layout of Punning Position in Dynamic Compaction for Loess

2013 ◽  
Vol 405-408 ◽  
pp. 304-309 ◽  
Author(s):  
Jing Cai ◽  
Yong Yu Wang ◽  
Ming Da Luo
Keyword(s):  
Shear Strength ◽  
Soil Samples ◽  
Model Tests ◽  
Dynamic Compaction ◽  
Dry Density ◽  
Test Results ◽  
Shear Strength Parameters ◽  
Strength Parameters ◽  
Angle Of Internal Friction ◽  
Tamping Energy

To find the influence of the layout of punning position in dynamic compaction for loess, four model tests are performed, which equal in the tamping energy but differ in the layout of punning position. In model tests the settlement, the dry density and the shear strength parameters of the soil samples are measured and analysis of the effects of different test plans is made. The test results manifested that the decrease of the distance between the pounding points might result in an increment of the settlement, the dry density and the cohesive strength but not the angle of internal friction. And from the comparison of the test results, a more efficient layout of punning position is given.

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