Test specimen shall be a representative sample based on the following table. Determination of dry density of soils, inplace, by the sand replacement method ced 43. The core cutter method covered by this part is suitable for finegrained soils free from aggregations. The apparatus needed is i sandpouring cylinder conforming to is. The unit weight of the soil in its field condition is known as field density or insitu density. The location of the test should be determined accurately. This test is done to determine the insitu dry density of soil by core cutter method as per is. Oct 07, 2016 the densification of soil is due to removal, readjustment and packing of the soil particles within its matrix.
Suitable lubricants are shellmold 02 and p5, paraffin oil, vegetable oils and silicone oils. Like other methods described here, core cutter method of field density test is used to determine the insitu density and compaction of soil embankment or subgrade why core cutter method is used in civil engineer. Aug 16, 2018 this is practical video to show core cutter method. It is a process of increasing soil density and removing air, usually by mechanical means.
Consistency limits liquid limit casagrande and cone penetration methods, plastic limit and shrinkage limit. Is2720part28determination of dry density of soils in place, by the sand replacement method. Effect of california bearing ratio on the properties of soil. Part xxxiii determination of density inplace by the ring and water replacement method. Density test for determining the percent of maximum density. Dry density of soil by core cutter method cylindrical core cutters of mm long and 100mm diameter are used for testing the insitu compaction of cohesive and clay soils placed as fill. The apparatus used in this field density test consists of a sand pouring cylinder, with pouring cone at its base. In order to evaluate the compaction of soil we have achieved at site. Field density test has been conducted by core cutter method. Field density test by core cutter method define civil. Field density apparatus field density test apparatus. There is a shutter between the cylinder and the cone. Dry density of compacted soil is a measure of the amount of the compaction achieved during the construction.
By using core cutter method, bulk density of soil can be quickly calculated and by determining the moisture content of the soil the dry density of the fill can. Once the field compaction is determined, a plot of the field moisture density compaction test is then compared to the proctor compaction curve. Apr 22, 2018 dry density of soil compaction test by core cutter method and calculations road construction civil. The densification of soil is due to removal, readjustment and packing of the soil particles within its matrix. The relationship that can be established between the dry density with known moisture content is as follows. This tip facilitates the understanding of core testing for acceptance of concrete, the corresponding astm standard and how it is used. Field density sand replacement method is 2720 part xxviii1974 11 depth of hole made in field is limited to 15 cm. So it is required to report the test result in terms of dry density. The details included in this test method are for use with the standard proctor test. Field density of soils by the core cutter method density. The main purpose of selecting this test location is to conduct the experiments on soil properties and then obtain the relations in order to obtain the design thickness of pavement because this road is. Knowing the field density and field moisture content, the dry density can be calculated. Using the following formula the relative compaction can be.
Core cutter method of field density test is conducted in the field to know whether the specified compaction is achieved or not in certain cases, it is necessary to determine the density of soil either as it exists naturally in the ground or as it may be compacted in the fill in the former case, this density of soil in place may be used to estimate the comparative strength of the soil. Core cutter method test for bituminous surface by pwd quality control test mobile van for road const duration. In situ density by core cutter and sand replacement methods. Field density test of soil by core cutter method for soil. Summary of method the test consists of the following steps which are explained in the test procedure. We are engaged in manufacturing and export of a range of quality field density test apparatus that is designed using advanced technology. The required percent of maximum density for the material depends on its location. Core cutter method is used to determine the field density of soft soils like clay soils or other cohesive soils which are placed as fills. The corecutter method covered by this part is suitable for finegrained soils free from aggregations. In core cutter method of field density test, a seamless steel tube is hammered and pressed into the soil layer. Jan 01, 2015 sand replacement test method is used to determine the field density or inplace density of earth embankments, road fills, subgrade, subbase or any of compacted material. Advantages of sand replacement method over core cutter method. In this method, a core cutter is driven into the undisturbed soil at the site and the insitu density is determined by taking the weight and volume of the soil along with the core cutter. This is practical video to show core cutter method.
Determination of field density of cohesion less soil is not possible by core cutter method because it is not possible to obtain a core sample. Advantages of sand replacement method over core cutter. But this facility can also be provided with core cutter. Aug 30, 2018 which field density test give more accurate result.
The results of these field tests are compared to the target values see chapter 5 to determine if the contractor has met specifications for density and moisture content of that lift. Determination of dry density of soils inplace by the core cutter method is. Compliant with is2720 part xxix, these apparatus consist of a cylindrical core cutter of a seamless tube, 10 cm internal diameter, and mm long, a dolly with lip to enable it to be. Determination of dry density of soils inplace by the corecutter method. Coefficient of permeability by constant head and variable head methods. Select locations starting after the second truck load. What is core cutting method used in civil engineering. This method cannot be used for coarse grained soil since the core cutter does not penetrate through them due to high resistance at the tip of the instrument. Which field density test give more accurate result. Standard proctor compaction test and modified proctor compaction test. In that post i have discussed about the sand replacement method and core cutter method of field density test. Dry density of soil by core cutter method for soil compaction. Determine the insitu dry density of soil by sand replacement. These are the core cutter method and the sand replacement method.
Core cutter method is 2720part291975 reaffirmed2005 theory. Determination of dry density of soils inplace by the core cutter method number of amendments. Is code book soil and foundation engineering indian. Dry density of soil compaction test by core cutter method and calculations road construction civil. Set the steel dolly on the top of the core cutter and use the steel rammer to push to its full depth. Knowing the field density and field moisture content, the dry density is calculated. Determine the insitu dry density of soil by core cutter method. Sand replacement method 28 6 grain size distribution of the soil by sieve analysis 35 7 determination of coefficient of permeability of the soil by a.
The difference between the two average density values are used to determine the correction factor d b in section 7. Astm c42c42m is the standard test method for obtaining and testing the strength of drilled cores and sawed beams of concrete. Determination of dry density of soils, inplace, by the sand replacement method. It is, therefore, very useful for control of earthworks and subgrade materials but is not suitable for coarse grained pavement.
Procedure record all information on sfn 9987 or sfn 2455. Mar 31, 2014 aim to determine the field density of soil by core cutter method reference is2720part29determination of dry density of soil in place by the corecutter method apparatus cylindrical core cutter steel rammer steel dolly balance steel rule spade or pickaxe straight edge knife procedure measure the height h and internal diameter d of the core cutter. Determine the insitu dry density of soil by core cutter. Download civil engineering handbook of material testing. This method serves as base upon which one can accept the density of a compacted material to a specified magnitude or to a percentage of maximum unit dry density determined as. The main purpose of selecting this test location is to conduct the experiments on soil properties and then obtain the relations in order to obtain the design thickness of pavement because this road is deteriorated in a short interval of time from its reconstruction work due to various. The common methods of determination of field density are core cutter, sand replacement, and rubber. Yes there is very interesting fact behind using dolly in core cutter, firstly dolly has a significant area around its circumference for proper transfering of energy by impact of rammer on it. Determination of dry density of soils inplace by the corecutter method number of amendments. Aim to determine the field density of soil by core cutter method reference is2720part29determination of dry density of soil in place by the core cutter method apparatus cylindrical core cutter steel rammer steel dolly balance steel rule spade or pickaxe straight edge knife procedure measure the height h and internal diameter d of the core cutter. Determination of field density of soil by core cutter method. Part xxix determination of dry density of soils inplace by the core cutter method is.
Chapter 6 standard test procedures determination of insitu density may 2001 page 6. Determining the wet density determining the moisture content calculating the dry density. Sep 12, 2016 core cutter method is used for determining dry density of the soil field compaction. Department of civil engineering geotechnical engineering lab. By conducting this test, it is possible to determine the field density of the soil. By using core cutter method, bulk density of soil can be quickly calculated and by determining the moisture content of the soil the dry density of the fill can be calculated and hence the voids percentage. As all the structures designed are to be rested on the soil with some sort of designed foundation and the success or failure of the foundation is dependent solely and completely on the performance and successful transfer of load into the ground without excessive settlement and shear. There are a number of methods available for measuring insitu density but only the two common methods are considered here. Determination of field density of cohesion less soil is not possible by core cutter method, because it is not possible to obtain a core sample. The inplace density of soil is needed for stability analysis, for the determination of the degree of compaction of compacted soil, etc. Note lubricate the sample tube inside and out by wiping it with a cloth containing a lubricant. This test is done to determine the insitu dry density of soil by sand replacement method as per is. Field density test apparatus core cutter method latest updates 18 june eie is pleased to announce its participation in international laboratory exhibition kenyalaborum being held at k.
Density of soil by core cutter method athraa alhassani. Legally binding document step out from the old to the newjawaharlal nehru invent a new india using knowledge. To determine the field or insitu density of soil by core cutter method reference is code. Core cutter method to determine dry density of soil youtube. These are the corecutter method and the sand replacement method. As all the structures designed are to be rested on the soil with some sort of designed foundation and the success or failure of the foundation is dependent solely and completely on the performance and successful transfer of load into the ground without. Therefore field density test is importance as a field control test for the compaction of soil or any other pavement layer. Core cutter method is used to determine the insitu density of finegrained natural or compacted soils free from aggregates using a core cutter. Sand replacement method for determination of field density. The moisture content is likely to vary from time and hence the field density also. Determination of field density test of soil by core cutter. Compaction of soil is one of the most important aspects in road construction. The drive tube method and nuclear method are the most time efficient tests and are widely used by several testing agencies. Indian institute of technology gandhinagar department of.
Unit weight determination core cutter method youtube. In one of my previous article i have already explained the field density test calculations that are performed after carrying out the tests. Core cutter method is used for determining dry density of the soilfield compaction. For good results, the sand used should be uniform, dry and clean passing a 1. Field density test of soil by sand replacement method. The insitu density is defined as the bulk density of soil measured at its actual depth.
By conducting this test it is possible to determine the field density of the soil. Determination of field density and moisture content soil compaction is defined as the method of mechanically increasing the density of soil. Remove the soil core from the cutter and take a representative sample to determine moisture content and hence dry density. Core cutter test dry density of soil by core cutter method. The cylinder is first calibrated to determine the unit weight of sand. Cylindrical core cutters of mm long and 100mm diameter are used for testing the insitu compaction of cohesive and clay soils placed as fill. Field density apparatus field density test apparatus latest. The mass of the soil pressed inside the tube is determined. Field density test fdt 7 methods and their comparison.
This method is only used on finegrained cohesive soils which do not contain stones. Clean and level the surface of an area 300 mm2 where the test is to be performed. Therefore, measurement of soil density and moisture content is used to. What is the purpose of using dolly in core cutter method. Core cutter method of field density test is conducted in the field to know whether the specified compaction is achieved or not in certain cases, it is necessary to determine the density of soil either as it exists naturally in the ground or as it may be compacted in the fill. Apr 02, 2014 to determine the field density of soil at a given location by sand replacement method.
676 585 1024 484 1417 1524 407 354 606 1400 733 81 454 925 1260 1206 1548 1562 1551 943 357 308 913 1354 895 1387 299 1141 1044 980 1186 38 1107 886 1468 703 1089 1139 1002