{"id":153,"date":"2016-09-10T19:06:36","date_gmt":"2016-09-10T19:06:36","guid":{"rendered":"http:\/\/onlinecivilforum.com\/site\/?p=153"},"modified":"2022-12-13T11:54:38","modified_gmt":"2022-12-13T06:24:38","slug":"important-points-for-grouting-of-post-tensioning-tendons-backfill-grouting","status":"publish","type":"post","link":"https:\/\/onlinecivilforum.com\/site\/important-points-for-grouting-of-post-tensioning-tendons-backfill-grouting\/","title":{"rendered":"IMPORTANT POINTS FOR GROUTING OF POST TENSIONING TENDONS – BACKFILL GROUTING"},"content":{"rendered":"

IMPORTANT POINTS FOR GROUTING OF POST TENSIONING TENDONS – BACKFILL GROUTING<\/h2>\n

The main objectives of grouting these ducts or sheath pipes in post-tensioned concrete members  are :-<\/h3>\n
<\/div>\n
(i) To prevent corrosion of the tendons,<\/div>\n
(ii) To ensure efficient transfer of stress between the tendons and the concrete member,<\/div>\n
(iii) To improve the serviceability and strength characteristics of the concrete member.<\/div>\n
<\/div>\n
The grouting is a very sensitive and receptive process that needs careful supervision and inspection. Following are some of the points that must be complied while practicing the grouting of the post-tensioned concrete members :-<\/div>\n
<\/div>\n
1. In the grout<\/span> mix, the quantity of sand or filler<\/span> material should not be more than 30 percent of the mass of cement.<\/div>\n
2. The chloride content in the grout from all sources should not exceed 0.1 percent by mass of the cement.<\/div>\n
3. Material of grout should be batched by mass.<\/div>\n
4. Optimum water \/ cement ratio is 0.40 without admixture<\/span> and with admixture can go upto 0.35<\/div>\n
5. The grout should be kept in slow continuous agitation until it is ready to be pumped<\/span> into the tendonducts.<\/div>\n
6. Grout should be mixed for minimum of 1 to 2 minutes but not more than 4 minutes.<\/div>\n
7. All the piping, pumping and mixing equipment should be thoroughly washed with clean water<\/span> after each series of operations.<\/div>\n
8. Ducts should be completely filled with grout after injection.<\/div>\n
9. Ducts should be grouted at a continuous and steady rate of 6 m \/ min to 12 m \/ min for horizontal ductsand 2 to 3 m \/ min for vertical ducts.<\/div>\n
10. Grouting pressure should not exceed 2 N \/ mm2<\/div>\n
11. Grouting should continue until the fluidity or density of grout flowing from free ends and vent openings is same as that of original grout.<\/div>\n
12. After closing all the vents the pressure of 0.5 N \/ mm2 should be kept for 5 minutes.<\/div>\n
13. Vertical and inclined ducts should be grouted from the lowest points.<\/div>\n
14. Maximum length<\/span> grouted in one operation being 50 m.<\/div>\n
15. Effectiveness of grouting should be checked<\/span> by non-destructive testing such as gamma<\/span> radiography.<\/div>\n
<\/div>\n","protected":false},"excerpt":{"rendered":"

IMPORTANT POINTS FOR GROUTING OF POST TENSIONING TENDONS – BACKFILL GROUTING The main objectives of grouting these ducts or sheath pipes in post-tensioned concrete members  are :- (i) To prevent corrosion of the tendons, (ii) To ensure efficient transfer of stress between the tendons and the concrete member, (iii) To improve the serviceability and strength …<\/p>\n","protected":false},"author":2264,"featured_media":154,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"two_page_speed":[],"footnotes":""},"categories":[26],"tags":[294,159],"class_list":["post-153","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-gendral-civil-engineering","tag-grouting","tag-post-tensioning"],"yoast_head":"\nIMPORTANT POINTS FOR GROUTING OF POST-TENSIONING<\/title>\n<meta name=\"description\" content=\"IMPORTANT POINTS FOR GROUTING OF POST TENSIONING TENDONS - BACKFILL GROUTING The main objectives of grouting these ducts\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/onlinecivilforum.com\/site\/important-points-for-grouting-of-post-tensioning-tendons-backfill-grouting\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"IMPORTANT POINTS FOR GROUTING OF POST-TENSIONING\" \/>\n<meta property=\"og:description\" content=\"IMPORTANT POINTS FOR GROUTING OF POST TENSIONING TENDONS - 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