In the construction of engineering structures such as highway embankments or earth dams, loose fills are required to be compacted to increase the soil density and improve their strength characteristics [1] . Sometimes, an existing soil deposit may need to be improve in order to enhance its engineering performance [2] Compaction is the most common and important method of soil improvement. The densification of soil by the application of mechanical energy is known as compaction it is process by which the soil grains get rearranged more closely, the volume of air voids get reduced, and density of soil increased [3] . Compaction generally leads to an increase in shear strength and helps improve the stability and the bearing capacity of a soil and reduced the settlements [4] . The degree of compaction of a soil is measured in terms of dry unit weight [5] . The soil compaction is accompanied by the remove of soil air, Changes in the soil structure. The soil compaction process is highly influenced by the soil water content [6] - [9] .

The aim of this research is to study the effect of using stone cutting slurry waste Al-Khamkha on the dry unit weight and the moisture content of Jerash cohesive soil consequently ,qualitative and quantitative analysis of soil compaction spots the light on soil strength characteristic performed for soil compaction to perform the compaction test, sample were taken from eastern area of Jerash city in Jordan and Al-Khamkha was taken from factories hold the generated slurry in open basins in Jerash city .

The compaction test was conducted using “Standard Proctor Test”. The soil is mixed with varying amount of Al-Khamkha and then compacted in three equal layers.

The moisture unit weight relationship was plotted for each sample tested to obtain the maximum dry unit weight.

Table 1 it lustrates the physical & chemical characteristic of slurry samples generated from the stone cutting process for different types of stone [16] [17] .

Table 2 and Table 3 illustrate the average of physical and chemical characteristic of Al-Khamkha which used in this research. The result of analysis was compared with other result for Table 2.

It was found that there was a great compositional difference in slurry driver from different cutting processes.

This variation in the mineralogical and chemical composition of the slurry was attributed to the variation in the type and origin of rocks (15).

To study the effect of Al-Khamkha on the dry unit weight of Jerash cohesive soils, samples were taken from eastern part of Jerash city. The physical properties of the soil are given in Table 4.

The soil is mixed with different amount of Al-Khamkha and compacted using “Standard Proctor Test” the optimum water content and maximum dry unit weight were obtained for trial as it is shown in Figure 1.

Table 5, Figure 2 and Figure 3 show as the amount of Al-Khamkha increase from 0% to 15%, the dry unit weight of Jerash cohesive soil increase from 14.4 KN/m³ to 16.5 KN/m³ and the optimum water content also increase from 14% to 19%. After that as Al-Khamkha increase up to 20% the dry unit weight of Jerash cohesive soil decrease up to 14.7 KN/m³ and optimum water canted increase to 25% as the amount of Al-Khamkha increase after that the dry unit weight decrease.

These result provide information about how may manage the compaction and the environment problem of Al-Khamkha to a wise procedure without wasting time, effort energy and money.

Figure 2 shows the relationship between the dry unit weight and the amount of Al-Khamkha.

Figure 3 shows the relationship between the optimum water content and Al-Khamkha.

It’s work thy to recall that for certain amount of Al-Khamkha and while increasing the amount of Al-Khamk- ha up to 15% the dry unit weight of Jerash cohesive soil increase with small increase of the water content. After that any increase of the amount of Al-Khamkha increase optimum water content and decrease the dry unit weight.

This investigation focuses on the effect of Al-Khamkha on dry unit weight of Jerash cohesive soil.

Results on Jerash cohesive soil show that as amount of Al-Khamkha mixed with the soil increases, the dry unit weight of Jerash cohesive soil increase up to 15% of Al-Khamkha and after that any increase of Al-Khamkha decreases the dry unit weight.

The maximum dry density of Jerash cohesive soil was founded at 15% of Al-Khamkha which may increase the dry density from 14.2 KN/m³ to 16.5% which intern increase the dry unit weigh of Jerash cohesive soil by 17%.

Increasing the dry unit weigh of Jerash cohesive soil and intern increasing soil strength characteristics, increasing soil bearing capacity, and creasing soil settlement.