**3. Experimental program**

The objective of this work is to study the effect of partial substitution of natural sand (50% dune sand and 50% sea sand) by a marble waste sand with rates 5, 10, 15 and 20% on the characteristics of mortars.

Reference mortar (control mortar) was prepared (0% marble waste sand) according to standard EN 196–1, with a quantity of water adjusted in order to obtain a reference consistency, the fixed parameters are cement and water dosage. The different mixes were prepared by replacing four percentages of natural sand with the same mass percentages of marble waste sand. This makes a total of five different mixes, including a control mortar. 4 <sup>4</sup> 16 cm<sup>3</sup> prismatic test pieces were made to determine the performance of hardened mortars as well as 5 <sup>5</sup> 5 cm<sup>3</sup> test

**4. Tests performed**

EN 1015-3.

18-433.

The tests carried out on the different formulations are:

*Introduction of Marble Waste Sand in the Composition of Mortar*

*DOI: http://dx.doi.org/10.5772/intechopen.91254*

• Density in the fresh state according to standard NF EN 1015-6.

• Air content determined according to standard NF P 18-353.

• Absorption by immersion measured by Neville, 2000.

accordance with standard EN196-1.

1015-3. The test is mentioned in the **Figure 6**.

ASTM C-267-96 standard.

**5. Results and discussion**

**5.1 Consistency of mortars**

results in better consistency.

**Figure 6.**

**39**

*Consistency of mortar.*

• Consistency, measured by the mini slump test in accordance with standard NF

• Flexural tensile and compressive strength at the age of 2, 7, 28 and 90 days, measured on 4 <sup>4</sup> 16 cm3 prismatic specimens preserved in water in

• Shrinkage and mass loss on specimens 4 <sup>4</sup> 16 cm<sup>3</sup> according to NF P

• Acid attack measured on cubic specimens of size 5 <sup>5</sup> 5 cm<sup>3</sup> according to

The slump of various mortars is evaluated according to the standard NF EN

The results of consistency of different mortars are shown in **Figure 7**. The figure shows that the increase in marble waste sand rate in the mortars increases slightly the consistency of the mortar. The maximum value is recorded by the mortar with 15%, with an increase of around 20% compared to that of the control mortar. This trend can be explained by the amount of fines present in the marble waste sand which enter the pores and thus release the trapped water, which

**Figure 4.** *Prismatic test pieces (4 4 16).*

**Figure 5.** *Cubic test pieces (5 5 5).*

pieces for acid attack tests **Figures 4** and **5**. Specimens produced from fresh mortar were demolded after 24 h and were then cured in water at 20 2°C until the date of the test. All tests are realized in the same conditions (laboratory conditions).

The different compositions of the mixtures for the five formulations are given in **Table 3**.


**Table 3.** *Compositions of mixtures.* *Introduction of Marble Waste Sand in the Composition of Mortar DOI: http://dx.doi.org/10.5772/intechopen.91254*
