*2.4.7 Soundness test*

*Geopolymers and Other Geosynthetics*

*Dimensionality test of geopolymer bricks.*

**units**

*Dimensionality test results of geopolymer bricks.*

**Dimensions No. of** 

millimeter. The overall lengths of the arranged bricks shall be measured with the help of a steel tape. Similarly the width and depth of the arranged bricks are measured along straight line. (Please refer to **Table 12** for the results obtained for

L 30 230 230 230 ± 5 B 110 110 110 ± 3 H 100 100 100 ± 3

**Dimension (mm)**

**Average dimension (mm)**

**Code recommendations (mm)**

In this test, the dried bricks after curing shall be allowed to fall from a height of 1 m from the ground. The ground shall be firm and leveled. Then the observations shall be noted down specifying whether cracks appeared, failure happened etc. All the samples tested show moderate edge failure which is acceptable. (Please refer to

The efflorescence is caused due to the presence of alkalis in bricks. When the bricks get exposed to moisture, water is absorbed by them. Due to evaporation this water absorbed dries out from the exposed faces. As a result of this, the soluble

the dimensionality test of the geopolymer bricks).

**Figure 4** for the results of the falling test).

*2.4.5 Falling test*

**Figure 3.**

**Table 12.**

*2.4.6 Efflorescence test*

**48**

**Figure 4.**

*Falling test of geopolymer bricks.*

The soundness test is conducted by striking two bricks against each other or by a light hammer [5]. If the bricks generate a clear metallic ringing sound and do not break, then those are good quality bricks. All the samples tested for soundness showed that they are heavy and good causing a metallic ringing sound when struck against each other.
