Material specification and composition mix ratio of lime, fly ash and gravel mixture

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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