Cement, fly ash, stabilized macadam, sand, stone chips and other road building materials are used as cement stabilized macadam base. Now let's talk about how to use different proportion test pieces for Jinan water stabilized concrete base course surface.
Through a certain number of raw material tests, the laboratory carries out mix design and compaction experiments to determine the high dry density and good water content. Then the test piece is made with this ratio. The test piece is kept wet and cured for 6 days at the specified temperature. After being immersed in water for 1 day, the unconfined compressive strength test is carried out.
(1) Through two kinds of proportioning tests on aggregate consisting of sand, crushed stone, cement and aggregate consisting of fly ash, crushed stone and cement, it is found that the cement stabilized mixture mixed with fly ash not only has good workability, but also is easy to form the test block. The formed test block has a good appearance and a high 7-day average strength.
(2) The unconfined compressive strength of lime soil specimens with different proportions in 7 days is about 1.0 mpa; However, the 7-day unconfined compressive strength of water stabilized specimens with different proportions is between 4 and 7 mpa (No. 325 ordinary cement is used, and the cement content is 5% to 6%).
(3) After several freeze-thaw cycles, the compressive strength of lime soil specimens with different proportions is almost zero; However, after 10 freeze-thaw cycles, the strength of water stabilized specimens with different proportions of cement and fly ash can still be measured.
Through observation and analysis, the lime soil base course with different proportions has poor slab properties, large dry shrinkage and temperature shrinkage coefficients, and the strength of such base course surface is reduced after being soaked in water. Under the repeated action of driving load, it is easy to be chewed into powder by surface materials, and it is easy to be mixed into slurry to flow away, gradually making the surface void, causing oil surface subsidence, cracking and falling off, which is the main cause of asphalt pavement diseases.
The water stabilized base composed of cement, fly ash, crushed stone, sand, stone chips, etc. has the characteristics of high strength, thin surface layer, good slab property, water stability, frost resistance, etc., which just makes up the defects of lime soil base, thus greatly improving the service life of asphalt concrete roads. Please consult us for more information on relevant matters http://www.ycgjglcl.com Come on!