I. Material specifications of lime, fly ash, gravel mix
The material specifications of lime, fly ash and gravel mixes should meet the following requirements:
1. fly ash
It should be a low activity pozzolanic material, the total amount of SiO2 and Al2O3 should be greater than 70%; the loss on ignition at 700°C should be less than 10%; when mixed with lime, it can play a hydraulic effect; the fineness of fly ash should be Satisfy 4900 mesh sieve throughput 50% ~ 80% / m3; water content should be 15% ~ 20%.
Gravel
Should be broken, sieved grading aggregate; maximum particle size not greater than 40mm; stone strength not lower than IV grade.
3. Lime
Grade 1 to 3 digestion lime or ground lime should be used.
4. Water
Use neutral water (pH 6~8) for drinking water, oil-free organics, and impurities.
Second, the composition ratio of lime, fly ash, gravel mixture
Lime, fly ash, and gravel mixes are based on a certain mix ratio and can be tested to obtain the best mix ratio before construction. The common experience is as follows:
Lime: fly ash: gravel=7:30:63 (I)
Lime: fly ash: gravel = 10:50:40 (II)
Lime: fly ash: gravel = 5:15:8 (I)
Lime: fly ash: gravel = 12:38:50 (II)
The selected gravel material or gravel material should be grading material instead of rock.
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