SEVERAL FACTORS AFFECTING THE STRENGTH AND DEFORMATION CHARACTERISTICS OF CEMENT-MIXED GRAVEL

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Related to the construction of a new type bridge abutment having the backfill of cement-mixed gravel, effects of moulding water content, w_i, compaction energy level, cement-to-gravel ratio by weight, c/g, and curing period on the stress-strain behaviour of compacted cement-mixed gravel and their correlations were investigated. A series of drained triaxial compression tests were performed on a well-graded gravel of crushed sandstone from a quarry mixed with ordinary Portland cement. Possible effects of inherent anisotropy produced by compaction in different directions were evaluated to a limited extent. The following results were obtained. With a fixed c/g, the maximum compressive strength is attained when compacted at w_i=the optimum water content, w_<opt>, for a given compaction energy level, while the compressive strength is not an unique function of compacted dry density of solid, ρ_d (or compacted void ratio, e). These trends of behaviour are analysed in terms of positive effects of higher ρ_d (or lower e) of cement-mixed gravel and an associated increase in the cement amount per total volume for a fixed c/g as well as effects of the amount and strength of cement paste, both being a function of moulding water content. The benefits of compaction at w_i=w_<opt> for a fixed compaction energy level in achieving higher compressive strengths increase with an increase in c/g and the curing period. The pre-peak stress-strain behaviour tends to become more linear with curing period. The effects of inherent anisotropy are not as significant as those with air-pluviated unbound sand.
社団法人地盤工学会の論文
2005-06-15

SEVERAL FACTORS AFFECTING THE STRENGTH AND DEFORMATION CHARACTERISTICS OF CEMENT-MIXED GRAVEL

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