All these results have been obtained using the standard proctor and modified proctor test methods. The most recent revision tothis technical guide lg004 other than minor editorial changes is. The standard proctor test astm d698 employs 12,400 ftlbsft. Army corps of engineers to better represent the compaction effort required for airfields to support heavy aircraft. His original test is most commonly referred to as the standard proctor. Astm d1557 12e1 standard test methods for laboratory. The modified compaction test uses a compaction effort approximately 4. Fundamentals of soil compaction intelligent compaction. According to proctor, the compaction of a soil mass is dependent on the following four major. Comparisons between modified proctor, standard proctor, 15 blow proctor, and porter static compaction tests on samples of silt and.
For example we could specify that field densities must be greater than 98% of the maximum dry unit weight as determined from the standard compaction test. Standard proctor test is not sufficient for airways and highways where heavier compaction is required. Standard test methods for laboratory compaction characteristics of soil using modi. Inplace measured densities of the compacted fill are compared to the proctor test results to. Standard and modified proctor compaction methods astm d. In case of modified proctor test the density value achieved is high than standard. The details included in this test method are for use with the standard proctor test. I believe that before wwii there was only the proctor test. Created as part of tufts universitys intro to geotechnical engineering course. Standard proctor density, lift thickness and number of passes. Of these 15 samples the most granular 5 samples were chosen for compaction behavior study. Astm d1557 07 standard test methods for laboratory. Research has been done showing the relationship between standard and modified proctor densi ty testing for different soils types as indicated below.
What is the difference between standard proctor test and modified. Test procedures are similar, but laboratory compactive effort of the modified. Standard proctor and modified proctor soil mechanics. Strong correlation between the laboratory dynamic cbr and. Test specimens of each cementtreated mixture were molded to near standard and modified proctor density, moist cured 7 or 28 days, and then immersed in water for 24 hour before being tested for unconfined compressive strength. Objective to determine the required amount of water to be used when. At the same time and for each proctor test, modulus tests are performed to obtain the lab soil modulus. Civil engineering specification for field compaction soil will be compacted to 98% relative compaction as. The graphical relationship of the dry density to moisture content is then.
Problem 4 a what is the difference between standard. In geotechnical engineering, soil compactionis the process in which a. Difference between standard proctor test and modified. Proctor compaction test civil official all about civil. Proctor went on to teach at the university of arkansas. Standard method of test for moisturedensity relations of soils using a 2. Proctor compaction testing unl digital commons university of.
Pdf use of proctor compaction testing for deep fill construction. Both standard and modified proctor tests are used to measure the optimum moisture content of any soil and maximum dry density. Also, the modified proctor compaction test is designated by astm d1557 and. The selection of either standard or modified compaction depends on the specification and generally standard compaction is more commonly used. Standard proctor test an overview sciencedirect topics. At that time, the compaction energy of the test was comparable to the. However, standard proctor density criteria is typically utilized in the eastern us where. Algorithms were subsequently developed to compare the difference between standard and modified proctors, as well. Its process is almost same as standard proctor test. The standard and modified proctor test procedures are straightforward. The modified proctor uses a 10 lb rammer falling 18, also in a standard mold. Evaluation of compaction parameters of finegrained soils. In order to evaluate the degree of compaction achieved at site, the field density carried out by field density test sand replacement method or any other method, is compared with the laboratory density determined by standard proctor test or modified proctor test.
Problem 4 a what is the difference between standard proctor test. Modified proctor test an overview sciencedirect topics. In order to realize the relationship between the moisture content and the compactness of soils, the compaction test is used so called proctor test and its result is the compaction curve a relationship. The density difference between modified proctor and standard. Modified proctor or standard proctor tests are performed and the optimum moisture content as well as the maximum dry density is determined from the compaction curves. Differences between the two tests include the weight of hammer used 2. Testing procedures for the standard and modified proctor test procedures are the american association of state highway and transportation officials aashto t99 and t180 respectively. Standard compaction test sct and modified compaction test mct are two very famous laboratory test methods to determine the compaction characteristics of soils worldwide. Compaction test proctor test civil engineering notes.
D155712e1 standard test methods for laboratory compaction characteristics of soil using modified effort 56,000 ftlbfft3 2,700 knmm3 density water content compaction particle size. In order to determine the suitability of standard and modi. Its process is almost same as standard proctor test with little differences which you will know. Both the standard proctor test and modified proctor are means of checking the compaction. In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made. Standard proctor test whole soil sample is compacted in 3 layers with 25 evenly distributed blows on each layer with 2. After the technician has conducted a field test to determine the actual field density of an embankment layer, a representative sample of soil, approximately 7 pounds, is removed from the area around the test. The modified proctor test, the reduced modified proctor test, the standard proctor test and the reduced standard proctor test are dynamic methods which use different compactive efforts. They wanted 100% standard proctor maximum dry density and i was. Standard proctor and modified proctor soil mechanics engineering.
These same design procedures were subsequently incorporated into post. Compaction test light weight standard proctor compaction is 2720part vii1980 reaffirmed2011 theory. Modified proctor test are more advanced than the standard test but the purpose are same. Proctor test are used for determining the optimum moisture where a soil type will give more density and can achieve maximum dry density. In 1958, the modified proctor compaction test was developed as an astm standard. The modified proctor test was introduced in 1958 as astm d1557 and aashto t 180 to help with these applications at higher loads. Soil density standard vs modified proctor reinforced soil structures routinely specify that all soils be compacted to 95% of the maximum density determined by astm d698 standard proctor density for conformance with the design. Laporan praktikum uji kepadatan standar standard proctor. What is the difference between standard proctor test and. The modified proctor test has a larger compaction capabilityenergy.
The proctor compaction test is a laboratory method of experimentally determining the optimal. If the differences are more than 2 to 3%, it will help to adjust the field. Proctor test standard or modified % relative compaction. His original test is most commonly referred to as the standard proctor compaction test. D1557 07 standard test methods for laboratory compaction characteristics of soil using modified effort 56,000 ftlbfft 3 2,700 knmm 3, compaction characteristics, density, impact compaction using modified effort, laboratory tests, modified proctor test.
Soil density standard vs modified proctor keystone retaining walls. The density difference between modified proctor and standard proctor density testing appears to increase with the percentage of fines in the soil matrix while the optimum moisture content decreases. Modified proctor test is used to determine the compaction of different types of soil and the properties of soil with a change in moisture content and the relationship between dry density and moisture content. This typically leads to variances between 8% and 11%, as shown above. Modified proctor test is used to determine the compaction of different types of soil and the properties of soil with a change in moisture content.
The standard proctor is a laboratory test performed in order to determine the maximum dry density and optimum moisture content of a given soil. Compaction tests results vary with the input compactive. Comparisons between modified proctor, standard proctor, 15blow. Standard proctor test or proctor compaction test was the original test.
Onepoint proctor if the soil is cohesive in nature, the indot family of curves may be used. Laporan praktikum uji kepadatan standar standard proctor test. A soils optimum moisture content is usually lower when compacted to modified proctor versus standard. Around the time of the war, there were larger and larger airplanes imposing more and more loads on the runways. Tampers, rammers, rollers, and vibrating plate compactors c. A modified proctor test is conducted by placing soil in a standard mold and. Testing requirements grain size, atterberg limits, density test nuclear andor lab and hydraulic. What are the four common types of compaction equipment. What is the difference between standard proctor test and modified proctor test. Get a copy of each standard astm d698 for standard proctor and astm d1557 for modified proctor. Standard proctor test procedure apparatus calculation.
Results from the proctor test are mostly used to determine the relative compaction of fill soils by dividing the dry density of the fill soil by the maximum dry density from the proctor. Modified proctor this is the same as the standard, except you use a 10 pound hammer dropped from a height of 18 inches. These laboratory tests generally consist of compacting soil at known moisture content into a cylindrical mold of standard. Us army corps of engineers developed modified proctor test which used greater levels of compaction and produced higher densities. Standard proctor on the geotechnical information website. This was followed by compaction of the samples using the standard and modified proctor.