摘要:

This paper presents the results of volume change measurements on laboratory-compacted samples of five Alberta clay soils which have been subjected to closed-system, unidirectional freezing. It was found that for Standard AASHO compaction effort, maximum shrinkage occurred at degrees of saturation between 60 and 70 per cent. The compacted degree of saturation required for 0 per cent total volume change ranged from 86 to 90 per cent. Maximum freezing shrinkage was found to increase with an increase in plasticity of the soil. Increasing the compactive effort from Standard to Modified AASHO caused a reduction in the maximum measured shrinkage in a highly plastic, lacustrine clay. A hypothesis, based on Powers' and Helmuth's theory of volume changes in cement pastes on freezing, is suggested as a simplified explanation of the observed behaviour. Field data are presented showing the effects of subgrade freezing on the changes in surface elevation of an asphalt-surfaced highway.

ISSN:0008-3674    

DOI:10.1139/t66-001

出版商:NRC Research Press    

年代:1966

数据来源: NRC

摘要:

The influence of disturbance in evaluating the results of in situ vane shear tests in clays is examined in the paper. The influence of other factors, such as non-homogeneity of the soil mass and the mode of failure induced by the vane apparatus, are also examined and recommendations are made concerning testing methods and interpretation in order to take such factors into account.

ISSN:0008-3674    

DOI:10.1139/t66-002

出版商:NRC Research Press    

年代:1966

数据来源: NRC

摘要:

The swelling characteristics of a postglacial lacustrine clay were studied by means of standard consolidation apparatus. The amount of swelling was measured for undisturbed specimens and remoulded specimens prepared to constant initial conditions. Specimens were allowed to swell under various surcharge loads. An empirical relationship was obtained between volume change, surcharge load, and initial water content. Swelling pressure for no volume change was obtained by three experimental procedures for different initial water contents and compared to values calculated from physico-chemica1 equations. Undisturbed specimens showed less swelling than remoulded specimens, but otherwise the results showed similar trends.

ISSN:0008-3674    

DOI:10.1139/t66-003

出版商:NRC Research Press    

年代:1966

数据来源: NRC

ISSN:0008-3674    

DOI:10.1139/t66-004

出版商:NRC Research Press    

年代:1966

数据来源: NRC

ISSN:0008-3674    

DOI:10.1139/t66-005

出版商:NRC Research Press    

年代:1966

数据来源: NRC

ISSN:0008-3674    

DOI:10.1139/t66-006

出版商:NRC Research Press    

年代:1966

数据来源: NRC