Haydite is produced from high-grade shale which is suitable for face brick manufacture. As a result of being burned at a temperature of approximately 2200 Deg. F., Haydite has no combustible content and is chemically inert. A typical chemical analysis of the finished product is shown in the following table:

Silica (SiO2)

57.6%

Ferric Oxide (Fe2O3)

9.6

Alumina (Al2O3)

19.4

Calcium Oxide (CaO)

3.4

Magnesium Oxide (MgO)

2.6

Sulfur Trioxide (SO3)

0.6

Alkalies (Na2O)

5.6

The approximate 24-hour absorption of Brooklyn Haydite is 10% by weight. Because of the non-connecting cellular structure of the aggregate and the small size of the cells, the absorption will vary substantially with the length of time it is exposed to water. The absorption procedures used with heavy aggregate are not readily adaptable to lightweight aggregate because of the difficulty of determining the saturated surface dry condition. As a result of these facts, the knowledge of the moisture content for mix control purposes is not particularly meaningful.

Haydite is produced to comply with the physical and chemical requirements of applicable A.S.T.M. standards except that the medium coarse size (B) is often supplied with additional eight mesh materials to achieve desired block textures. The medium fine size (AX) is too coarse to comply with the gradation requirements.

C-330 - Lightweight Aggregate for Structural Concrete 
C-331 - Lightweight Aggregate for Concrete Masonry Units 
C-332 - Lightweight Aggregate for Insulating Concrete (Group II)

"A" size Haydite is a fine gradation which is used for cast-in-place concrete, lightweight masonry, precast concrete, athletic running tracks and for "Gunite" or "Shotcrete" applications.

"AX" is a medium fine gradation used where a coarse sand sized material is desired.

"BX" size Haydite is a blend of fine and medium coarse Haydite used where bin availability limits the use of separate sizes. It is ordinarily intended for block production. Its use for cast-in-place concrete should be limited to low density, low strength roof fill.

"B" size Haydite is a medium coarse gradation used for cast-in-place concrete, precast concrete, and concrete block production.

"L" size Haydite is a coarse gradation used for ground cover.

All sizes are used in various horticulture applications: "C" for hydroponics; "A" and "AX" for soil amendments; "B" and "C" and "L" for pine bark replacement.

Indicated unit weights of aggregates are only approximate and should not be used as the basis for establishing batch weights. Batch weights should be based on actual unit weights as determined by the Standard Method of Test for UnitWeight of Aggregate (ASTM) Designation; C 29) Utilizing the shoveling procedure described in section 11.

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