| The impact of mixing fly ash and slag powder with concrete on the flow ability and mechanical property of channel lining of mold bag concrete |
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| DOI：10.7606/j.issn.1000-7601.2019.02.05 |
| Key Words: channel lining mold bag concrete fly ash slag powder extended degree air content |
| Author Name | Affiliation | | XIE Tian-yi | College of Water Resource and Architectural Engineering, Northwest A & F University, Yangling, Shaanxi 712100, China | | LOU Zong-ke | College of Water Resource and Architectural Engineering, Northwest A & F University, Yangling, Shaanxi 712100, China | | HUO Yi-zhen | Department of Civil Engineering, Hetao University, Bayannur, Inner Mongolia 015000, China | | JIREN Guriba | Inner Mongolia Xinyu Water Resources and Hydropower Engineering Construction co., Ltd, Bayannur, Inner Mongolia 015000, China |
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| Abstract: |
| This paper studied the influence of compound admixture on the liquid retention capacity, the air holding capacity, and the mechanical properties of the concrete bags, and provided reference for the production practice of the tunnel lining in the cold region. For double\|mixing 10%, 20%, 30% or 40% of fly ash and 10%, 15% or 20% slag powder, at the same degree of extension and air content level of new mixing, we used mold bag concrete loss rate at 1h extension degrees, 1h air content and 28d compressive strength loss rate as examining index. The results showed that when the mixture with less than 30% of fly ash and less than 20% of slag powder, with the increase in fly ash and slag powder, air hold capacity of mold bag concrete loss rate and expansion loss rate were reduced. It is found that the optimal addition rate was 30% of fly ash and 20% of slag powder. Increasing amount of admixture reduced the early strength of concrete, but 28d compressive strength met the design requirements, and increased with the increase in slag powder content. The optimal addition were 10% of fly ash and 20% of slag powder. The best combination was 30% of fly ash and 20% of slag powder. |
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