A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Isotropic compression and triaxial shear behaviors of cement- and cement-gravel-treated granite residual soil for use as subgrade filling
https://orcid.org/0000-0002-0880-579X
Highlights Effect of cement additive on post-yielding compressibility of GRS is revealed. Pre-yielding compressibility of GRS has non-monotonic correlation with gravel dosage. Strength parameters have non-monotonic correlations with cement and gravel dosages. Proper cement and gravel dosages were proposed based on mechanical behavior.
Abstract The easy-disintegration nature and weak mechanical properties of granite residual soil (GRS) hinder its utilization as subgrade and embankment fillings. In this study, cement additive was used to introduce artificial interparticle cementation, and gravel additive was used to introduce coarse skeleton. Isotropic compression and triaxial shear tests were conducted on saturated cement-treated and cement-gravel-treated GRS to determine their compressibility and drained strength. Results show that, for the saturated cement-treated GRS, the post-yielding compression parameter (λpost-yielding) involved non-monotonic with the volumetric cement content (C vi) and peaked at C vi = 3%; its effective strength parameters (c' and φ') peaked at C vi = 2 ∼ 3%. Adding gravel markedly decreased the compressibility and increased the drained strength of the cemented GRS. For the saturated cement-gravel-treated GRS, the pre-yielding compression parameter (λpre-yielding) involved non-monotonic with the volumetric gravel content (C vG) and troughed at C vG = 20 ∼ 30%; its c' and φ' peaked and troughed at C vG = 20 ∼ 30%, respectively. These non-monotonic correlations may be because macro-porosity of the cured specimens reached the lowest at C vi = 2 ∼ 3% and a global gravel skeleton formed at C vG = 20 ∼ 30%. Hence, a cement dosage of C vi = 2 ∼ 3% is suggested for treating the GRS (a silty sand) before it can be used as subgrade filling, and cement-gravel treatment with C vG = 20 ∼ 30% can be further considered to minimize the cement dosage and obtain higher geotechnical performance of the treated soil.
Isotropic compression and triaxial shear behaviors of cement- and cement-gravel-treated granite residual soil for use as subgrade filling
https://orcid.org/0000-0002-0880-579X
Highlights Effect of cement additive on post-yielding compressibility of GRS is revealed. Pre-yielding compressibility of GRS has non-monotonic correlation with gravel dosage. Strength parameters have non-monotonic correlations with cement and gravel dosages. Proper cement and gravel dosages were proposed based on mechanical behavior.
Abstract The easy-disintegration nature and weak mechanical properties of granite residual soil (GRS) hinder its utilization as subgrade and embankment fillings. In this study, cement additive was used to introduce artificial interparticle cementation, and gravel additive was used to introduce coarse skeleton. Isotropic compression and triaxial shear tests were conducted on saturated cement-treated and cement-gravel-treated GRS to determine their compressibility and drained strength. Results show that, for the saturated cement-treated GRS, the post-yielding compression parameter (λpost-yielding) involved non-monotonic with the volumetric cement content (C vi) and peaked at C vi = 3%; its effective strength parameters (c' and φ') peaked at C vi = 2 ∼ 3%. Adding gravel markedly decreased the compressibility and increased the drained strength of the cemented GRS. For the saturated cement-gravel-treated GRS, the pre-yielding compression parameter (λpre-yielding) involved non-monotonic with the volumetric gravel content (C vG) and troughed at C vG = 20 ∼ 30%; its c' and φ' peaked and troughed at C vG = 20 ∼ 30%, respectively. These non-monotonic correlations may be because macro-porosity of the cured specimens reached the lowest at C vi = 2 ∼ 3% and a global gravel skeleton formed at C vG = 20 ∼ 30%. Hence, a cement dosage of C vi = 2 ∼ 3% is suggested for treating the GRS (a silty sand) before it can be used as subgrade filling, and cement-gravel treatment with C vG = 20 ∼ 30% can be further considered to minimize the cement dosage and obtain higher geotechnical performance of the treated soil.
Isotropic compression and triaxial shear behaviors of cement- and cement-gravel-treated granite residual soil for use as subgrade filling
https://orcid.org/0000-0002-0880-579X
Highlights Effect of cement additive on post-yielding compressibility of GRS is revealed. Pre-yielding compressibility of GRS has non-monotonic correlation with gravel dosage. Strength parameters have non-monotonic correlations with cement and gravel dosages. Proper cement and gravel dosages were proposed based on mechanical behavior.
Abstract The easy-disintegration nature and weak mechanical properties of granite residual soil (GRS) hinder its utilization as subgrade and embankment fillings. In this study, cement additive was used to introduce artificial interparticle cementation, and gravel additive was used to introduce coarse skeleton. Isotropic compression and triaxial shear tests were conducted on saturated cement-treated and cement-gravel-treated GRS to determine their compressibility and drained strength. Results show that, for the saturated cement-treated GRS, the post-yielding compression parameter (λpost-yielding) involved non-monotonic with the volumetric cement content (C vi) and peaked at C vi = 3%; its effective strength parameters (c' and φ') peaked at C vi = 2 ∼ 3%. Adding gravel markedly decreased the compressibility and increased the drained strength of the cemented GRS. For the saturated cement-gravel-treated GRS, the pre-yielding compression parameter (λpre-yielding) involved non-monotonic with the volumetric gravel content (C vG) and troughed at C vG = 20 ∼ 30%; its c' and φ' peaked and troughed at C vG = 20 ∼ 30%, respectively. These non-monotonic correlations may be because macro-porosity of the cured specimens reached the lowest at C vi = 2 ∼ 3% and a global gravel skeleton formed at C vG = 20 ∼ 30%. Hence, a cement dosage of C vi = 2 ∼ 3% is suggested for treating the GRS (a silty sand) before it can be used as subgrade filling, and cement-gravel treatment with C vG = 20 ∼ 30% can be further considered to minimize the cement dosage and obtain higher geotechnical performance of the treated soil.
Isotropic compression and triaxial shear behaviors of cement- and cement-gravel-treated granite residual soil for use as subgrade filling
Dong, Xinxin (author) / Bao, Xiaohua (author) / Cui, Hongzhi (author) / Xu, Changjie (author) / Chen, Xiangsheng (author)
2023-05-11
Article (Journal)
Electronic Resource
English
| European Patent Office | 2015
Cement treated gravel pavements
| Engineering Index Backfile | 1956