Aggregate 40 coarse sand

The terms cement and concrete are not synonymous. Concrete is artificial stone made from a carefully controlled mixture of cement, water, and fine and coarse aggregate (usually sand and coarse rock). 

Material Asphalt Straight asphalt Filler Ground limestone Powdered rubber Coarse aggregates Crushed stone Nos. 5, 6 and 7 Fine aggregates Coarse and Fine sands Except for powdered rubber, the same materials as the left column... 

Mix and Specimen Preparation. Most of the mixes described in this paper were prepared from a fairly one-sized medium-coarse sand with 35% voids in the mineral aggregate and with only 2%% of the material finer than No. 200 mesh. The sand grading is included in Table I. A 150/200 penetration grade asphalt was used. 

Aggregate Suitability Evaluation. As indicated earlier, most of the mixes studied were made with medium-coarse sand. However, a number of mixes were prepared to explore the range of aggregate gradations which may benefit from sulfur addition to asphalt compositions. The gradations in Table I cover materials from fine blow sands to coarse pit... 

Specialty concrete contains specialized binders such as K silicate, calcium aluminate, sulfur, and oxysulfate or polymer resins. In contrast to conventional construction products, specialty concrete is not based on Portland cement. Instead, specialty concrete is composed of specialty cement such as potassium silicate that is mixed with water, a coarse aggregate such as gravel or crushed stone, and a fine aggregate or sand. 

Coarse and fine aggregates are typically used. The coarse material, usually crushed gravel or stone, is sized by retention on a No.4 sieve [4.75 mm (0.019 in) openings]. Fine aggregates, usually sand, are retained by a No. 200 [75 im (0.003 in) openings] sieve. 

Concreteyiggregate. A versatile appHcafion for coarse limestone aggregate is in Pordand cement concrete, either job-mixed or ready-mixed for a wide variety of concrete appHcafions, such as footings, poured foundations, paving, curbs, stmctural products, etc. Limestone sand also provides a satisfactory fine aggregate, but usually it is more cosdy than conventional sand from local pits. 

Coarse aggregate was crushed limestone with a maximum size of 19 mm. Fine aggregate was natural sand. Air-entraining admixture was a sulfonated hydrocarbon. 

Volume of dry-rodded coarse aggregate per unit volume of concrete for different fineness moduli of sand... 

The amount of PBN rubber in the experiment was 100 mass parts the content of other components was CaO (5 mass parts), filler (87.5 mass parts), sand (300 mass parts), and coarse aggregate (680 mass parts). 

The study indicated that high stability mixes may be attained with aggregates ranging in gradation from fine sands to coarse gravels. However, the abundance of inexpensive sands makes them the most attractive candidates for mix production in most areas. 

---