The longer the time, the higher the cement strength, but the growth rate decreased obviously after 7 days. Because the cement dosage of cement stabilized materials is very small, the strength has not been greatly improved for too long, and the construction unit does not allow it.
Extended data:
Experiments show that:
(1) Through the test of two kinds of mixture ratios with sand, crushed stone and cement as the aggregate and fly ash, crushed stone and cement as the aggregate, it is found that the cement stabilized mixture mixed with fly ash not only has good workability, but also is easy to form, and the formed sample has good appearance and high 7-day average strength.
⑵ The 7-day unconfined compressive strength of lime-soil specimens with different proportions is about 0mpa, while the 7-day unconfined compressive strength of water-stabilized specimens with different proportions is between 4 and 7 MPa.
(3) After several freeze-thaw cycles, the compressive strength of lime-soil specimens with different proportions is almost zero; However, the strength of water-stabilized specimens mixed with cement and fly ash can still be measured after 10 freeze-thaw cycles.
Through observation and analysis, the physical properties of lime-soil base with different proportions are poor, and the dry shrinkage and temperature shrinkage coefficients are large. After being soaked in water, the strength of the base surface is reduced, and it is easy to be chewed into powder by the surface material under the repeated action of driving load, and it is easy to mix with the infiltrated water and flow away into mud, gradually making the surface layer empty.
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