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2 Subjects and scope of the study:

Subjects of study: Conventional concrete using aggregates according to TCVN, fly ash mineral additives, quick lime, chemical additives, divided into 03 groups of

x Group III: group of samples using fly ash instead of cement and adding super flexible_increase intensity additive The samples in this group together have a certain amount of super flexible_increase intensity additive and change in fly ash content: 0% (control), 30%, 40%, 50%

3 Result:

When not using super flexible_increase intensity additive and CaO: if the content of fly ash to replace cement is increased from 30% to 50%, the workability will increase significantly and the compressive strength also decreases, the pH also decreases strongly

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When adding CaO to the aggregate, the concrete mixture decreased, the setting time slowed down and the compressive strength of the concrete increased slightly but the pH in the concrete of the fly ash aggregates increased strongly

When using the super flexible_increase intensity additive in the fly ash mix, the concrete mixture has an increase in slump, the setting time is prolonged, the compressive strength of the concrete increases, but the pH is less changed compared to The aggregate is only fly ash Concrete aggregation using 30% fly ash instead of cement with highest compressive strength for the use of reasonable fly ash content combined with this additive

When not using super flexible_increase intensity additive: Sample with fly ash content to replace cement from 0%, 30%, 40%, 50% for lower tensile stress development rate and increasing cracking age so sample 50% has the best crack resistance but the limit tensile stress is the lowest due to low compressive strength

Investigating the effect of fly ash on cracking resistance when using super flexible_increase intensity additive: All gradients have superior crack resistance compared to the unadopted blends In which, 30% aggregate has the maximum tensile stress limit and meets the technical requirements should be considered as the optimal aggregate

CHAU MINH HIEU

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Trang 18

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