(A) The dry materials used for mortar shall be thoroughly mixed with sufficient clean water to produce a uniform, plastic, workable and cohesive mixture.
(B) Sand for mortar and grout shall be clean, dry, well-graded sand, free of organic or other deleterious matter, silt or other objectionable inorganic matter, and shall be of such size as determined by laboratory sieves, conforming to the following gradation:
Sieve Size | Percent Passing |
3/8-inch sieve | 100% |
1/4-inch sieve | 95 - 100% |
No. 20 sieve | 50 - 85% |
No. 100 sieve | 0 - 15% |
(C) Cement shall be Type II Portland Cement. An industrial grade all-purpose non-shrinking cement such as “All Crete” or “Speed Crete” may be used.
(D) No admixtures shall be used in the mortar or the grout unless otherwise specified or approved by the Engineer.
(E) Mortar shall be composed of cement and sand proportioned and mixed as specified herein. Type “A” mortar shall be used unless Type “B” is specified by the Engineer.
(1) Type “A”. Type “A” shall consist of one part by volume of cement and two parts by volume of sand.
(2) Type “B”.
(a) Type “B” shall be a case basis, mixed and used in accordance with manufacturer’s recommendations.
(b) Mixed mortar shall be used before initial set, and in no case will re-tempering with additional water be permitted.
(Ord. 2019-02, passed 4-25-2019)