Experimental study on crack-filling ability of aggregate sand mixture to act as a potential upstream material in zoned dams
By: Malik, Bilal Ahmed
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Contributor(s): Lone, Mohd Akbar.
Publisher: USA Springer 2023Edition: Vol.53(4), Aug.Description: 827-843p.Subject(s): Construction Engineering and Management (CEM)Online resources: Click here
In:
Indian geotechnical journalSummary: Uniformly graded sand is recommended as a good upstream material for crack-filling and stopping erosion in zoned dams but its presence at the site is not always guaranteed. Also, it can be highly expensive and its transportation charges may also be an additional burden on the overall cost of a project. To find an alternative material, a mixture of aggregates and sand was tested for crack-filling action. Testing was conducted on a mixture of sand with two types of aggregates. One type of aggregate has a size lesser than 20 mm and another having size more than 20 mm. Aggregates were mixed with 5–60% sand by weight to prepare admixtures of different gradations. In the case of upstream materials with aggregates finer than 20 mm, no crack-filling was observed for sand content of 5–30%. Partial crack-filling was observed for mixtures with a sand content of 35–45% and complete crack-filling was observed when sand content was increased to 50%. In the case of upstream materials with aggregates coarser than 20-mm crack-filling was not observed up to sand content of 35%. Partial crack-filling was observed for mixtures with a sand content of 40–50% and complete crack-filling was observed for mixtures with a sand content of 55 and 60%. It was observed that for a particular aggregate size, with an increase in sand content in the mixture, the probability of crack-filling increases. Also, for a certain sand content, with an increase in the size of aggregate in the upstream material crack-filling ability decreases.
| Item type | Current location | Call number | Status | Date due | Barcode | Item holds |
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Articles Abstract Database
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School of Engineering & Technology (PG) Archieval Section | Not for loan | 2024-0066 |
Uniformly graded sand is recommended as a good upstream material for crack-filling and stopping erosion in zoned dams but its presence at the site is not always guaranteed. Also, it can be highly expensive and its transportation charges may also be an additional burden on the overall cost of a project. To find an alternative material, a mixture of aggregates and sand was tested for crack-filling action. Testing was conducted on a mixture of sand with two types of aggregates. One type of aggregate has a size lesser than 20 mm and another having size more than 20 mm. Aggregates were mixed with 5–60% sand by weight to prepare admixtures of different gradations. In the case of upstream materials with aggregates finer than 20 mm, no crack-filling was observed for sand content of 5–30%. Partial crack-filling was observed for mixtures with a sand content of 35–45% and complete crack-filling was observed when sand content was increased to 50%. In the case of upstream materials with aggregates coarser than 20-mm crack-filling was not observed up to sand content of 35%. Partial crack-filling was observed for mixtures with a sand content of 40–50% and complete crack-filling was observed for mixtures with a sand content of 55 and 60%. It was observed that for a particular aggregate size, with an increase in sand content in the mixture, the probability of crack-filling increases. Also, for a certain sand content, with an increase in the size of aggregate in the upstream material crack-filling ability decreases.
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