703AGGREGATES

New Hampshire Department of Transportation Standard Specifications – 2016

Table 703-1 -- Required Grading, Graded Coarse Aggregates Standard Stone Size

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#89 Min to Max 3/4” to 1-1/2” No. 4 to 2” No. 4 to 1-1/2” No. 4 to 1” No. 4 to 3/4” No. 4 to 1/2” No. 16 to 3/8” Sieve Size Percentage by Weight Passing 2-1/2” --- 100 --- --- --- --- --- 2” 100 95-100 100 --- --- --- --- 1-1/2” 90-100 --- 95-100 100 --- --- --- 1” 20-55 35-70 --- 95-100 100 --- --- 3/4” 0-15 --- 35-70 --- 90-100 100 --- 1/2” --- 10-30 --- 25-60 --- 90-100 100 3/8” 0-5 --- 10-30 --- 20-55 40-70 90-100 No. 4 --- 0-5 0-5 0-10 0-10 0-15 20-55 No. 8 --- --- --- 0-5 0-5 0-5 5-30 No. 16 --- --- --- --- --- --- 0-10 No. 50 --- --- --- --- --- --- 0-5

New Hampshire Department of Transportation Standard Specifications – 2016

Description

1.1Cement mortar shall consist of either Portland cement or masonry cement, mortar sand, and water.

Materials

2.1Portland cement shall conform to 520.2.1.

2.2Mortar sand shall meet the requirements of AASHTO M 45 except as shown in Table 707 -1.

Table 707-1 - Gradation of Mortar Sand Sieve Size Percent by Weight Passing No. 8 100 No. 16 60 - 100 No. 50 15 - 35 No. 100 2 - 15 No. 200 0 - 5 Note: In lieu of the above, fine aggregate graded in accordance with 520.2.2.2.2 may be used in mortar for mortar rubble masonry and with concrete blocks for catch basins and drop inlets.

2.3Testing for impurities shall comply with AASHTO T 21. Results that are darker than the standard shall be cause for rejection,

except as provided in 2.3.1.1. 2.3.1 Sand for mortar not conforming to 2.3.1 shall be tested in accordance with AASHTO T 71 and shall meet the requirements of 5.2.3 of AASHTO M 45.

2.4Water shall meet the requirements of 520.2.5.

Proportions and Procedures

3.1Mortar shall be composed of one part by volume of Portland cement, except as specified in 3.4, and two parts by volume of

damp loose mortar sand with water as necessary to obtain required consistency.

3.2Hand mixing of mortar shall require thorough mixing of the dry cement and damp sand, in a clean, tight mortar box until the

mixture is of a uniform color. Water shall be added in such quantity as to form a mortar having the desired consisten cy.

3.3Machine mixing of mortar shall require mixing of the dry cement and damp sand, then adding water, to an approved mixer,

for not less than three minutes to reach workability.

3.4Cement for mortar in ashlar or for mortar squared stone masonry shall consist of Portland cement only.

3.5Mortars shall be used and placed in final position within two and one-half hours after mixing.

3.6Mortar for bridge curbs shall meet the requirements of 609.2.5 and shall be used as specified under 609.3.1.7.