815CEMENT

686

The aggregate and cement shall be formulated by volumetric measure in the proportions of one part cement to four parts sand and five parts gravel or nine parts of bank run gravel, or to designated proportions of other materials, then damp mixed in a concrete mixer using sufficient water to provide for a crumbly consistency.

Prepackaged sack riprap which utilizes approved bagging material and a dry mixture of predried sand-cement material may be substituted for the concrete sacked riprap noted in this Article provided

the packing material is permeable and absorptive enough to permit passage of sufficient water to provide for hydration of the cement, (3) the sand and cement materials are from sources acceptable to the Materials and Tests Engineer, (4) the sand and cement are dry mixed in the proportions of 5 cubic feet {0.14 m³} of sand to one bag of cement until uniform in color, (6) packaging, handling, and storage shall be such as to prevent damage to the prepackaged material, especially from collecting excess moisture until placed.

814.03Filter Blanket

Filter blanket material shall consist of a blanket of aggregate or geotextile blanket placed under a riprap material.

An aggregate blanket may be either gravel or crushed stone ALDOT Size No. 467 aggregate, unless otherwise shown on the plans, reasonably free from flat or elongated pieces and from organic or soft friable particles in objectionable quantities.

The geotextile shall meet the requirements of AASHTO M 288 for Permanent Erosion Control Geotextile and Section 810 of these specifications. CEMENT

815.01Portland Cement

Type I Portland Cement shall meet the requirements of AASHTO M 85 and the additional requirements shown below.

Type II Portland Cement shall meet the requirements of AASHTO M 85 and the additional requirements shown below.

Type III Portland Cement shall meet the requirements of AASHTO M 85 and the additional requirements shown below.

Type IS Portland blast furnace slag cement shall meet the requirements of AASHTO M 240, Blended Hydraulic Cement.

Type IL Portland limestone cement shall meet the requirements of AASHTO M 240, Blended Hydraulic Cement.

Type IP Portland pozzolan cement shall meet the requirements of AASHTO M 240, Blended Hydraulic Cement. CEMENT 687

815.02Blank

815.03Blank

815.04Blank

815.05Blank

815.06Masonry Cement

Masonry cement shall meet the requirements of ASTM C 91.

815.07Chemical Properties

The Specifications for all cements as covered by Articles 815.01 to 815.06, inclusive, are amended to the effect that the total alkali content of any cement used, calculated as the percentage of sodium oxide (Na2O) plus the product of 0.658 times the percentage of potassium oxide (K 2O), shall not exceed 0.60 percent. In addition to the above, for Type II cement covered by Article 815.02, the standard chemical requirement shown in Table 1 of AASHTO M 85 for Tricalcium Silicate (C 3S) is hereby waived.

815.08Testing of Cement

All cement furnished for use shall be tested before use or be from an approved producer meeting the requirements of ALDOT-227, Quality Control of Portland and Blended Hydraulic Cements, and listed on List I-2, PRODUCERS OF PORTLAND AND BLENDED CEMENT, of the Department's "Materials, Sources, and Devices With Special Acceptance Requirements" Manual. Refer to Subarticle 106.01(f) and ALDOT- 355 concerning this list.

815.09Flash Set and False Set

Flash set and false set, as determined by ASTM C 451, shall be cause for rejection of the cement.

815.10Unusual Appearance

Unusual appearance as to color, etc. shall be sufficient grounds for rejection of the cement.

815.11Use, Care, and Handling

equivalent to 94 pounds {42 kg} net of cement.

inspected by the Engineer prior to use. Cement shall be fully protected from contamination or damage during handling.

springless dial type and shall be the product of a reputable manufacturer. Scales shall be accurate to within a tolerance of 5 pounds per 1000 pounds {2 kg per 455 kg} net load in the hopper. The value of the minimum gradation of any scale shall not be greater than 0.1 percent of the scale capacity.

container is being approached, such as a springless dial indicator or tare beam. Such device shall indicate at least the last 50 pounds {22 kg} of load.

handling or in transit.

(substructure or superstructure) except as permitted in writing. All cement in any container having lumps of cement or caked cement, or cement which for any reason has become damaged or partially set, shall be rejected. Cement salvaged from discarded or used bags shall not be used. Cement shall not be used while its temperature is more than 150 °F {65 °C}.

including that from ready-mix plants. Copies of these records shall be furnished the Engineer at the close of each day's work or 8 hour run, in such form as he may require, showing the quantity used during the day or run at each part of the work. LIME FOR ROADBED AND BASE STABILIZATION 688

dampness. Cement not for immediate use shall be stored in suitable weatherproof buildings. Buildings shall be placed in approved locations. Provisions for storage shall be ample and the shipment of cement as received shall be separately stored in such a manner as to provide easy access for identification and inspection of each shipment. On small structures, storage in the open may be permitted by authorization, in which case a raised platform and ample waterproof covering shall be provided. Stored cement shall meet the test requirements at any time after storage when a retest is ordered.

be mixed. LIME FOR ROADBED AND BASE STABILIZATION

817.01Hydrated Lime

Hydrated lime shall be high calcium (Type 1) and shall conform to AASHTO M 216 when tested in accordance with AASHTO T 219. Hydrated lime shall be stored and handled in water-proof containers until immediately before distribution to the road. If storage bins are used, they shall be completely enclosed. Hydrated lime in bags shall be stored in weatherproof buildings with adequate protection from ground dampness.

817.02Quicklime

Quicklime shall meet the requirements of AASHTO M 216 after hydration in the laboratory. Quicklime shall be handled and stored in waterproof containers until used. Accidental contact with water shall be avoided. When quicklime is to be applied directly to the roadbed, the following additional requirements shall apply: For 3/4 inch {19.0 mm} Quicklime (“Pebble”) Sieve % Passing by Weight (Mass) 3/4 inch {19.0 mm} 90 - 100 1/4 inch {6.5mm} 30 - 80 No. 10 {2.0 mm} 0 - 60

For top-size 3/8 inch (9.5 mm} Quicklime (“Fines”) Sieve Min. % Passing by Weight (Mass) 3/8 inch {9.5 mm} 100 No. 10 {2.0 mm} 30

817.03Lime Kiln Dust

Lime kiln dust (LKD) is a by-product of making lime. LKD shall be stored and handled in water-proof containers until immediately before distribution to the road. LKD shall meet the following requirements when tested in accordance with ASTM C 25: Combined total calcium oxide and magnesium oxide 50 % minimum Available calcium hydroxide (rapid sugar test, ASTM C 25), plus total MgO content calculated to be equivalent Ca(OH)2 30 % minimum Loss on ignition (carbon dioxide plus moisture, combined and free on as-received basis) 40 % maximum Free water (as-received basis) 4 % maximum Sulfur as SO3 10 % maximum Sieve analysis. Sieve Size Min. % Passing by Weight (Mass) No. 4 {4.75 mm} 95 No. 30 {600 µm} 90 No. 100 {150 µm} 75