Grout for use in concrete masonry construction should comply with astm c476, standard specification for grout for masonry ref. Each grout lift needs to be consolidated before the next lift is placed to ensure a good bond. Pdf performance of no vibration no admixture masonry grout. Astm c476 19 standard specification for grout for masonry.
Pdf when hollow concrete masonry is used for construction in high. Grout mixes shall contain an approved admixture conforming to the requirements of. Astm c 476, the grout must be sampled and tested in accordance with astm c 1019 ref. Other equivalent means of stress transfer to accomplish the same 50 percent. Grout for masonry1 masonry institute of washington.
Grout is not mortar nor concrete and is a cementitious. Astm c476 01 standard specification for grout for masonry. Meets and exceeds the performance requirements of astm c476 for masonry grouts. It is specified per astm c 476, specification for grout for masonry. C476 01 standard specification for grout for masonry, aggregates, cement, compressive strength, grout, masonry, portland cement, proportions. Low and highlift grouting are both traditional grouting methods, with the difference being the height of lift. Then continue mixing at mediumhigh speed for another 23 minutes, until a uniform, lump free pourable consistency mix is achieved. Astm c476 99 standard specification for grout for masonry. With the advent of newer high range water reducers such as polycarboxylates, however, this problem is no longer evident ref. The northwest masonry guide miw, bellevue, washington 206 453 8820. A number in parentheses indicates the year of last reapproval. Grout for concrete masonry tek 94a mortar, grout, stucco 2005. Astm c476 grout for reinforced and nonreinforced masonry.
Each type fine and coarse is further classified as conventional grout requiring mechanical consolidation by puddling or vibration when placed and selfconsolidating grout not requiring mechanical consolidation when placed. In high lift grouting placing grout into grout columns as high as 24 ft 7. For high lift grouting, the mixed material should be pumped or poured from a. The grout proportions used to produce a grout with. In order to comply with astm c476, the base mix design, was determined to have a waterto. Insist that the mix design submitted indicate compliance with astm c476.
The mixing of grout shall conform to the requirements of astm c476. The masonry grout filler contains admixtures in accordance to astm c 476. The units shall be of whole, sound materials and free from cracks and other defects. Masonry grout should have a slump between 8 and 11 inches and should contain no water reducers or plasticizers approved grout aid should only be specified when required by some agencies for high lift. Astm c476 16 standard specification for grout for masonry. The high lift grouting method as developed foruse in reinforced hollow. Testing of mortar and grout will be performed under provisions of section 01400. The grout space in highlift grouted masonry shall be a minimum of 312.
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