On this page we can learn three different soil compaction test methods that are specified in BS 1377. Soil compaction is very important step for any structure because if compaction is not done properly. After the soil compaction is complete a sample is taken in order to fulfill the required quantity of total material as required by the testing agency.
BS 1377 Part 3 & BRE Chemical and electro-chemical tests; BS 1377 Part 4 Compaction-related tests; BS 1377 Part 5 Compressibilty, permeability and durability tests; BS 1377 Part 6 Consolidation and permeability tests with pore pressure measurement; BS 1377 Part 7 Shear strength tests (total stress) BS 1377 Part 8 Shear strength tests (effective. BS 1377 was first published in 1948 and first appeared in metric form in 1975. The standard is in the process of being revised and will comprise nine separate parts. Part 7 of this standard describes methods of test for determining the shear strength parameters of soils in terms of total stresses, or (in the case of drained direct shear tests.
Soil compaction is defined as the method of mechanically increasing the density of soil. In construction, this is a significant part of the building process. If performed improperly, settlement of the soil could occur and result in unnecessary maintenance costs or structure failure. Almost all types of building sites and construction projects utilize mechanical compaction techniques.
If the sample is damp, dry it until it becomes friable under a trowel. Drying may be in air or by use of a drying apparatus maintained at a temperature not exceeding 60°C (140°F). Thoroughly break up aggregations in a manner that avoids reducing the natural size of individual particles.
Here we are talking about the three methods that include 2.5 kg rammer method, 4.5 kg rammer method and the vibrating hammer method.
The 2.5 kg rammer method
An air dried representative sample of the soil under test is passed through a 20 mm sieve and 5 kg collected. This soil is then thoroughly mixed with enough water to give a fairly low value of water content. For sands and gravelly soils the commencing value of w should be about 5 per cent but for cohesive soils it should be about 8 to 10 per cent less than the plastic limit of the soil tested.
The soil is then compacted in a metal mould of internal diameter 105 mm using a 2.5 kg rammer, of 50 mm diameter, free falling from 300 mm above the top of the soil, see Fig. 11.1. Compaction is effected in three layers, of approximately equal depth. Each layer is given 27 blows which are spread evenly over the surface of the soil.
The compaction can be considered as satisfactory when the compacted soil is not more than 6 mm above the top of the mould. (Otherwise the test results become inaccurate and should be discarded.) The top of the compacted soil is trimmed level with the top of the mould. The base of the mould is removed and the mould and the test sample it encloses are weighed.
Samples for water content determination are then taken from the top and the base of the soil sample, the rest of the soil being removed from the mould and broken down and mixed with the remainder of the original sample that passed the 20 mm sieve. A suitable increment of water (to give some 2 per cent increase in water content) is thoroughly mixed into the soil and the compaction is repeated. The test should involve not less then five sets of compaction but it is usually continued until the weight of the wet soil in the mould passes some maximum value and begins to decrease.
Bs 1377 Part 4 Pdf Converter
Eventually, when the test has been completed, the values of water content corresponding to each volume of compacted soil are determined and it becomes possible to plot the dry density to moisture content relationship.
The 4.5 kg rammer method
In this compaction test the mould and the amount of dry soil used is the same as for the 2.5 kg rammer method but a heavier compactive effort is applied to the test sample. The rammer has a mass of 4.5 kg with a free fall of 450 mm above the surface of the soil. The number of blows per layer remains the same, 27, but the number of layers compacted is increased to five.
The vibrating hammer method
It is possible to obtain the dry density/water content relationship for a granular soil with the use of a heavy electric vibrating hammer, such as the Kango. A suitable hammer, according to BS 1377, would have a frequency between 25 and 45 Hz, and a power consumption of 600 to 750 W: it should be in good condition and have been correctly maintained.
This Part of BS 1377 has been prepared under the direction of the Road Engineering Standards Policy Committee. It is part revision of clause 5 of BS 1377 : 1975 which is superceded by amendment. BS 1377 was first published in 1948 and first appeared in metric form in 1975. The standard is in the process of being revised and will comprise nine separate parts. Part 7 of this standard describes methods of test for determining the shear strength parameters of soils in terms of total stresses, or (in the case of drained direct shear tests) in terms of effective stresses which are equal to total stresses. None of these procedures therefore requires measurement of pore water pressure which is covered in part 8 of BS 1377. Shear strength is determined either by measuring the shearing force causing failure (direct shear tests) or by derivation from the measured compressive strength (unconfined or triaxial compression tests), these tests, and the apparatus used are described. Reference is made to Part 1 of the standard for general requirements that are relevant to all Parts. For the abstract for BS 1377 : 1990 Part 1 see IRRD 830334, for BS 1377 : 1990 Part 5 see IRRD 830335.
- Availability:
- Find a library where document is available. Order URL: http://worldcat.org/isbn/0580182649
- Corporate Authors: BRITISH STANDARDS INSTITUTE2 PARK STREET
LONDON, United Kingdom W1A 2BS - Authors:
- -
- Publication Date: 1990
Language
- English
Media Info
- Pagination: 47 p.
- Serial:
- Publisher: BRITISH STANDARDS INSTITUTE
Subject/Index Terms
- TRT Terms: Compression; Measuring instruments; Pore water pressures; Residual soils; Saturated soils; Shear strength; Soil mechanics; Soils; Standards; Strength of materials; Tests; Triaxial shear tests; Vane shear tests; Vanes (Machinery)
- Uncontrolled Terms: Residual; Undrained soils
- Geographic Terms: United Kingdom
- ITRD Terms: 6155: Apparatus (measuring); 5532: Compression; 5762: Pore water pressure; 9069: Residual; 5531: Shear; 4156: Soil; 5755: Soil mechanics; 187: Specification (standard); 5544: Strength (mater); 6255: Test; 5566: Triaxial; 5782: Undrained soil; 8119: United Kingdom; 6158: Vane
- Subject Areas: Geotechnology;
Filing Info
Bs 1377 Part 4 Pdf Fillable
- Accession Number: 00606874
- Record Type: Publication
- Source Agency: Transport and Road Research Laboratory (TRRL)
- ISBN: 0-580-18264-9
- Report/Paper Numbers: BS 1377: Part 7
- Files: ITRD, TRIS
- Created Date: Mar 31 1991 12:00AM