(1) Prepare lime fly ash mixture with different proportions (such as 10: 90, 15: 85, 20: 80, 25: 75, 30: 70,
35: 65, 40: 60, 45: 55 and 50: 50), determine their respective optimum water content and maximum density, determine the compressive strength of specimens with the same age and degree of compaction, and select the proportion of lime fly ash with the greatest strength;
(2) According to the lime-fly ash ratio obtained in the previous paragraph, 4-5 parts of lime-fly ash soil or lime-fly ash graded aggregate with different mixing ratios of the same soil sample are prepared;
(3) Determine the optimum water content and dry density of various lime-fly ash soil or lime-fly ash graded aggregate (by heavy compaction test method);
(4) According to the specified degree of compaction, calculate the dry density of lime-fly ash soil and lime-fly ash graded aggregate specimens with different mixing ratios;
(5) Prepare the test piece according to the optimum water content and the calculated dry density. When carrying out strength test, the number of test pieces used for parallel test shall comply with the provisions in Table 25 1. If the deviation coefficient of the test results is greater than the value specified in the table, the test should be repeated and the reasons should be found out to solve it. If the deviation coefficient cannot be reduced, the number of specimens should be increased;
(6) The specimen shall be kept wet for 6 days at the specified temperature, and after soaking for 24 hours, the unconfined compressive strength test shall be carried out according to the Test Code for Stabilized Materials of Inorganic Binders in Highway Engineering (JTJ057);
(7) calculating the average value and deviation coefficient of the test results;
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