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| Study on engineering properties of sand with different calcium carbonate contents |
| LI Sa，LIU Fushi，DAI Xu，ZHANG Yanlong |
| (Civil Engineering Department，Tianjin University，Tianjin 300072，China) |
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Abstract In order to study the influence of calcium carbonate content on the engineering properties of sand，the laboratory tests on four grain groups of sand with different calcium carbonate content are conducted. The characteristics of particle breakage and shear strength of sands are analyzed，and the results show that：The relative breakage increases with the increment of calcium carbonate content and the grain size. With the increase of the normal stress，the effect of calcium carbonate content on relative breakage becomes more obviously. The influence of calcium carbonate content on sand shear strength is significant，the friction angles increases with the increment of calcium carbonate content，and the larger the particle size is，the more obvious influence appears. The friction angle of small particle with high calcium carbonate content are close to that of large particle with low calcium carbonate content. Considering the effect of calcium carbonate content and particle size，an index named carbonate content index is suggested，and the soils are classified based on it.
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2019, Vol. 38 
