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Haydite Masonry Unit Properties

Haydite aggregate is produced by expanding suitable shales in rotary kilns at a flame temperature of approximately 2200 oF. It is a hard, inert, vitreous material with innumerable isolated air cells. Mixed with Portland Cement and made into concrete masonry units, it produces the finest lightweight unit available. The outstanding physical properties of Haydite masonry units have been demonstrated over the years. This Data Sheet presents a summary of these properties. Additional information and basic test data are readily available.

Weight

The concrete in a Haydite masonry unit can be custom blended to achieve the desired density and can be less that 85 lbs. cf 3 when using only Haydite and cement. It is the unique combination of low weight and high strength of Haydite units which gives them their outstanding physical characteristics. The table shown below gives the approximate weights of 8" and 12" Haydite units at various concrete densities. The weight of a given nominal size unit will vary, as indicated in the table, depending upon the equivalent thickness, the degree of compaction, number of cores, etc.

Strength

Haydite masonry units surpass the requirements of A.S.T.M. Designation: C-90 "Load Bearing Concrete Masonry Units". Haydite units for engineered masonry construction can easily achieve the high net area strengths required.

Fire Resistance

The lightweight vitreous nature of Haydite aggregate imparts excellent fire resistive properties to Haydite masonry units. These units are rated for 2, 3 and 4 hour fire resistance periods. These ratings are based on factors such as face shell thickness, equivalent thickness, and cement-aggregate ratio.

The heat resisting properties of Haydite are being constantly demonstrated through the use of Haydite refractory concrete at service temperatures up to 2000oF. in blast furnace downcomers, coke oven floors, jet engines test cells, etc.

Texture

Haydite aggregate, due to its strength, grading and particle shape, is outstanding in its ability to produce block with pleasing, desirable, uniform textures. This pleasing architectural finish is highly desirable for many different types of construction.

Thermal Insulation

Haydite Lightweight Units can provide twice the insulative R-value of normal weight concrete units, while still providing a very high degree of thermal mass.

Properties Lightweight Medium Normal
Aggregate 100% Haydite
Expanded Shale
ASTM C-331
Blend of
Lightweight
&
Normal weight
ASTM C-331 & ASTM C-33
Blend of
Lightweight
&
Normal weight
ASTM C-331 & ASTM C-33
Typically
Normal weight
ASTM C-33
Concrete
Oven Dry Density1
lbs./cf3
Less Than
85
Less Than
105
105 to 125 125 or more
              8" Units

Block Weight 2
lbs. max

24.7 30.0 35.1 39
Fire Resistance  3
Hours

(UBC, BOCA, SBC)
2 2 1 1
Fire Resistance
Hours 4
(certain local codes)
2 1 1 1
R Value
(Perlite Fill)5
7.5 5.8 4.4 3.8
Sound Transmission
Class STC
46 6 46 7 48 7 49 7
          12" Units
Block Weight 2
lbs. max
34.7 42.3 49.4 55
Fire Resistance  3
Hours

(UBC, BOCA, SBC)
4 4 3 3
Fire Resistance
Hours 4
(certain local codes)
4 3 3 3
R Value
(Perlite Fill)5
10.9 8.2 6.1 5.2
Sound Transmission
Class STC
50 6 49 7 51 7 52 7
         
  1. ASTM C 90 - 93 STANDARD SPECIFICATION FOR LOAD BEARING CONCRETE MASONRY UNITS.

  2. CALCULATED FOR 51% SOLID 8' UNITS, AND 47% SOLID 12"- UNITS, AT A MOISTURE CONTENT OF 40'/o OF MAXIMUM WATER ABSORPTION PERMITTED FOR TYPE I UNITS IN EACH WEIGHT CLASSIFICATION.

  3. UNIFORM BUILDING CODE (1994), BUILDING OFFICIALS AND CODE ADMINISTRATORS (1994), STANDARD BUILDING CODE (1991).

  4. ALTHOUGH BOCA AND UBC GUIDELINES ESTABLISH REQUIRED EQUIVALENT THICKNESS THROUGH VOLUMETRIC INTERPOLATION OF BLENDED AGGREGATES SOME STATES HAVE NOT ADOPTED THIS PRACTICE. PLEASE CHECK YOUR LOCAL BUILDING CODES.

  5. INDIANA CONCRETE MASONRY ASSOCIATION, GUIDE FOR USE WITH ASHREA STANDARD 90.1-1989.

  6. EXPANDED SHALE CLAY AND SLATE INSTITUTE, LIGHTWEIGHT CONCRETE INFORMATION SHEET NO. 8.

  7. NATIONAL CONCRETE MASONRY ASSOCIATION, TEK 13-1.

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