TECHNICAL BULLETIN EBE-01
Pressed Earth Brick – Eltham Soil Type

AMCER
Pressed Earth Bricks are a blend of selected local gravel, sand, silt and clay held together by the colloidal attraction of the clay.
The clay binds these materials together and minimises water absorption.

Specifications
Nominal Dimensions 85 x 385 x 250 mm  
Dimensional Tolerance 3 %, 1 %, 1 %  
Weight of  Brick approx 15.80 Kg  
Weight per Cubic Metre > 1850 Kg  
Colour Beige/Ochre  
Compressive Strength > 4.0 Mpa Note 1
Modulus of Rupture > 150 kPa Note 2
Accelerated Erosion Test < 10.0 mm pitting depth Note 3
Fire Resistance > 2-4 Hours Note 4
Acoustic Attenuation > 50dBA Note 5
Thermal Transmission <2.90 - W/M2 C Note 6
Thermal Mass (Lag) 250mm  >8 Hours Note 7


Note 1 - Swinburne Compressive Test Results
Sample Maximum Failure Load (kN) Compressive Strength (Mpa)
Brick 1

416

4.32

Brick 2

440

4.57

Brick 3

468

4.88


Note 2 - Swinburne Modulus of Rupture Test Results

Sample

Failure Load (kN)

Modulus of Rupture (kPa)
Brick 1

1.00

180

Brick 2

1.17

210

Brick 3

1.11

200


Note 3 - Swinburne Accelerated Erosion Test

Test Result – 9.2 mm Pitting Depth

Classification

Pitting Depth (mm)

Excellent

0 - <10 mm

Good

10 - <20 mm

Fair

20 - <30 mm

Poor

> 30 mm


Note 4 - Fire Resistance
No specific testing has been conducted on AMCER Pressed Earth Bricks. The National Building Technology Centre results concluded that a load bearing 250 mm Adobe block wall achieved a fire-resistance rating of 4 hours in terms of AS1530, Part4 – 1975. Based on the NBTC test results, the NBTC concluded that all forms of Earth-Wall construction could be assumed to have a minimum fire rating of 2 hours.

Note 5 - Acoustic Attenuation
No specific testing has been conducted on AMCER Pressed Earth Bricks. The National Building Technology Centre published limited test results indicating that 250 mm Adobe construction would achieve an airborne sound transmission rating of 50 dBA. The New Mexico Institute of Mining and Technology publication of 1992 results indicated a rating of 63 dBu

Note 6 - Thermal Transmission
No specific testing has been conducted on AMCER Pressed Earth Bricks. The National Building Technology Centre published limited test results indicating the Thermal Transmission of Earth Wall construction.

Wall Thickness (mm)

U-Value – W/M2 C

250 mm

2.86

300 mm

2.56

350 mm

2.33

400 mm

2.14


Note 7 - Thermal Mass - Thermal Time Lag
No specific testing has been conducted on AMCER Pressed Earth Bricks; this value is based on various reported tests of Earth Buildings.
AMCER conducts ongoing testing for thermal performance.



AMCER Earth Brick Specifications subject to change without notice due to continuing research and product improvement.