Download Citation on ResearchGate | On Jan 1, , ASTM and others published D standard test method for unconfined compressive strength of. definitions of terms. 1 This test method is under the jurisdiction of ASTM Committee D18 on Soil and Last previous edition approved in as D – 00e1. Page 1. ASTM D Unconfined Compressive Strength. Page 2. Page 3.
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Indexed in Science Citation Index Expanded. Achenza and Fenu [ 16 ] reported bricks with adobe stabilized with vegetal fibers and a composite axtm natural polymers. Many countries in the world have to deal with the problem of expansive clays vertisols such as Mexico, the USA, Australia, South Africa, India, and Israel among others.
Dry and crumbly soils, fissured or varved materials, silts, peats, and sands cannot be tested with this method to obtain valid unconfined compression strength values. The increase in density causes increases in resistance. Due to this problem, these soils are replaced by soils with inert features [ 2 ], thus remaining as trash soils. To determine these values, test specimens were prepared with dimensions: From the gradation via humid analysis, the percentage of particles less than 0.
Results are plotted in Figure 2.
It seems that the latter modified the porosity 0 apparent density of asfm bricks and improved their behavior under water action and their compressive strength too.
Therefore, there are two main factors that determine the best density of soil material: This was done to know the grain size distribution and the proportion of sizes of its constitutive particles.
Application of Compaction Energies The compacting procedure for the stabilized soil was compaction by layers with a weight falling from a controlled height Proctor compaction procedure. Tests and Experimental Methods 3.
For stabilization of expansive clay, three different doses of CaOH, namely, 6, 8, and 10 percent of its dry weight, were aggregated to each sample. Bricks made of fly ashes, CaOH, and calcium sulfide are one of the best alternatives for bricks of conventional burned clay. The rate of humidity absorption depends greatly on cement content. Our results show that two optimal compaction energies can be considered with respect to the variation of optimum moisture in masonry bricks of expansive soil stabilized with lime.
Indeed, at that percentage there is little or nil variation of the liquid limit and the plastic index, even increasing the CaOH content. My presentations Profile Feedback Log out. The liquid limit was With this procedure, sustainable bricks of high and homogeneous resistance can be obtained. This caused a poor compaction of the material low density values because water cannot move instantaneously under the compacting hammer blows [ 17 ].
This was done to define the best behavior and strength. Unlike soils, pure rock solid material between joints is an elasto-plastic material, subject to elastic recovery.
This probably occurs due to dd2166 continuous increase in compaction energy that causes the soil particles and humidity to achieve their best accommodation: Figure 2 shows that the increase in density causes increases in resistance.
Higher compaction energy values do not improve density. To make this website work, we asym user data and share it with processors. Earth is a cheap, ecological, and plenty material for construction. Soil compaction produces an increase in resistance and decreased deformability.
Unconfined Compression Test ASTM D /02 – ppt video online download
astn Compressive strength increases 2. Then with the objective of identifying the nearest energy value, the following tests were performed between values of Proctor standard and Proctor modified energies.
The compaction energy was selected to be the best reasonable strength. First, the soil was stabilized with CaOH which leads to a decrease in its volumetric changes. Geotechnical Characterization Geotechnical characterization of the expansive soil under study was made such as gradation test, according to ASTM D standard [ 18 ].
Therefore two optimal compaction energies can be considered with respect to the variation of optimum moisture, the first when the optimal humidity reaches its smallest value and the second when it increases, after reaching its lowest value.
Remolding device if remolded sample is tested. These pieces are preferred because of their cultural reasons, accessibility, and long history. A generalized solution has been to extract them and substitute them by inert soil; thus they become construction trash. These soils are mainly of the expansive type and show volumetric instability due to humidity variations.
Mohr Circle for stress In 2D space e. In this respect, there have been efforts for producing these bricks with fly ashes and a small percentage of CaOH. Geotechnical Properties of Soil By 0 analysis, via dry and humid, it was determined that the soil was a material with fines, since