CONCRETE MATERIALS Sample Clauses
CONCRETE MATERIALS. A. Cementitious Material: Use the following cementitious materials, of the same type, brand, and source, throughout Project:
1. Portland Cement: ASTM C 150, Type I, gray. Supplement with the following:
a. Fly Ash: ASTM C 618, Class F.
b. Ground Granulated Blast-Furnace Slag: ASTM C 989, Grade 100 or 120.
B. Normal-Weight Aggregates: ASTM C 33, graded.
1. Maximum Coarse-Aggregate Size: 1-1/2 inches nominal.
2. Fine Aggregate: Free of materials with deleterious reactivity to alkali in cement.
C. Water: ASTM C 94/C 94M.
CONCRETE MATERIALS. A. Cementitious materials and aggregates shall have proven history of successful use together, or submit evidence satisfactory to Architect that aggregate will not react harmfully in presence of alkalis in cement
B. Cementitious materials and aggregates for exposed concrete shall be from same source throughout the work.
C. Cementitious Material: An intimate blend of Portland cement and fly ash.
1. Portland Cement: ASTM C150, Type II, low alkali.
2. Fly Ash:
a. ASTM C618, Class C, except maximum loss on ignition shall be 2.5% and maximum retained on No. 325 sieve shall be 30% plus or minus 2%.
b. Fly ash content shall be between 25 and 35 percent by weight of the total cementitious material. Use of fly ash is required as specified herein.
D. Fine and Coarse Aggregates for Normal Weight Concrete: ASTM C33, standard aggregates. To comply with CBC Section 1903.3.
CONCRETE MATERIALS. A. Source Limitations: Obtain each type or class of cementitious material of the same brand from the same manufacturer's plant, obtain aggregate from single source, and obtain admixtures from single source from single manufacturer.
B. Cementitious Materials:
1. Portland Cement: ASTM C 150/C 150M, Type I, Type II, orType I/II, gray.
2. Fly Ash: ASTM C 618, Class F or C.
3. Slag Cement: ASTM C 989/C 989M, Grade 100 or 120.
4. Silica Fume: ASTM C 1240, amorphous silica.
C. Normal-Weight Aggregates: ASTM C 33/C 33M, coarse aggregate or better, graded. Provide aggregates from a single source.
1. Maximum Coarse-Aggregate Size: 3/4-inch (19 mm) nominal.
D. Air-Entraining Admixture: ASTM C 260/C 260M.
E. Chemical Admixtures: Certified by manufacturer to be compatible with other admixtures and that do not contribute water-soluble chloride ions exceeding those permitted in hardened concrete. Do not use calcium chloride or admixtures containing calcium chloride.
1. Water-Reducing Admixture: ASTM C 494/C 494M, Type A.
2. Retarding Admixture: ASTM C 494/C 494M, Type B.
3. Water-Reducing and Retarding Admixture: ASTM C 494/C 494M, Type D.
4. High-Range, Water-Reducing Admixture: ASTM C 494/C 494M, Type F.
5. High-Range, Water-Reducing and Retarding Admixture: ASTM C 494/C 494M, Type G.
6. Plasticizing and Retarding Admixture: ASTM C 1017/C 1017M, Type II.
CONCRETE MATERIALS. 2.2.2.1 Cement: Type GU, conforming to CSA A3001. Cement shall originate from the same mill.
CONCRETE MATERIALS. Composition of mixes, production, sampling, testing and compliance to be in accordance with BS EN 206-1 and BS 8500. Mixing: The amount of water used in each batch of concrete shall be sufficient only to ensure the hydration of the cement and to give reasonable workability of the concrete. Within a maximum period of 20 minutes the concrete is to be placed where it is required and tamped or vibrated. Concrete ingredients to be measured in proper gauging boxes and mixed in proper platforms. The materials to be well mixed with a concrete mixer or by turning over by hand until the colour of the cement is distributed over the aggregate and a due proportion of clean fresh water is applied through a hose. No concrete shall be remixed after it has started to set, neither shall it be reused. Concrete shall not No concrete shall be mixed or placed when the air temperature is below 5°C or during any time when the aggregate or ground surface is frost bound. During frosty weather, recently placed concrete to be adequately protected. Unless otherwise specified in the Schedule of Works, the mix of the concrete shall be 1:2:4 cement: sand: aggregate. Types of Mixes: Ordinary prescribed mixes to BS EN 206-1 and BS 8500 using ordinary Portland cement and aggregates to BS EN 12620 and A1. Batching by weight (kg): Grade Cement Fine Aggregate Coarse Aggregate Normal Use C20P 50 115 190 Below ground (unreinforced) C25P 50 90 170 Below ground (reinforced) The finished surface of floor slabs taking tiled or sheet flooring should not vary by more than 3mm in 3m under a straight edge.
CONCRETE MATERIALS. A. Cementitious Material: Use the following cementitious materials, of the same type, brand, and source, throughout the Project:
1. Portland Cement: ASTM C 150, Type I/II. Supplement with the following:
CONCRETE MATERIALS. 1. Cementitious materials: Information showing type, manufacturing locations, shipping locations, manufacturer’s quality control reports, and certificates showing compliance with ASTM C150, ASTM C595, ASTM C618, ASTM C845, ASTM C989, ASTM C1157, or ASTM C1240.
2. Aggregates: Information showing types, pit or quarry locations, producers’ names, gradings, specific gravities, and evidence not more than 90 days old demonstrating compliance with requirements herein.
3. Admixtures: Information showing types, brand names, producers’ names, manufacturers' technical data sheets, and certificates showing compliance with ASTM C494/C494M, ASTM C1017/C1017M, or ASTM D98.
CONCRETE MATERIALS. A. Materials shall be delivered, stored, and handled so as to prevent damage by water or breakage. Only one brand of cement shall be used. Cement reclaimed from cleaning bags or leaking containers shall not be used. Cement shall be used in the sequence of receipt of shipments.
B. Materials for the WORK shall comply with the requirements of Sections 201, 203, and 204 of ACI 301- Structural Concrete for Buildings, as applicable.
C. Storage of materials shall conform to the requirements of Section 205 of ACI 301.
D. Materials for concrete shall conform to the following requirements:
1. Cement shall be standard brand Portland cement conforming to ASTM C 150 - Portland Cement for Type II or Type V.
CONCRETE MATERIALS. Cement: Cement shall be of Portland type and shall conform to the requirements of BS 12 or equivalent. The contractor shall select only one type or brand of cement or others. Changing of type or brand of cement will not be permitted without a new mix design approved by the Engineer. All cement is subject to the Engineer’s approval, however, approval of cement by the Engineer shall not relieve the Contractor of the responsibility to furnish concrete of the specified compressive strength. Conveyance of cement by jute bags shall not be permitted. Storage in the Contractor’s silo or storehouse shall not exceed more than two (2) months, and age of cement after manufacture at mill shall not exceed more than four
CONCRETE MATERIALS. Cement: ASTM C150, Portland Cement Type – IA, Air Entrained.