Evaluation of physical and mechanical properties of rock for drilling condition classification

2013 ◽  
Vol 10 (4) ◽  
pp. 359-366 ◽  
Author(s):  
B. Adebayo ◽  
B. Adetula
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Uniaxial Compressive Strength ◽  
Physical And Mechanical Properties ◽  
Point System ◽  
Drilling Rate ◽  
Quartz Content ◽  
Drilling Condition ◽  
Drilling Rate Index

This work deals with the investigation of physical and mechanical properties of selected rocks for condition of drilling categorization. Rock samples collected from five drilling locations were tested in the laboratory for uniaxial compressive strength, tensile strength, and Drilling Rate Index (DRI) using 1,100 kN compression machine, point load tester and miniature drill. Similarly, hardness, brittleness, Rock Abrasivity Index (RAI), penetration rate and bit wear rate were determined. The results showed that uniaxial compressive strength, tensile strength and Drilling Rate Index varied from 47.78 - 111.11 MPa, 8.09 - 19.44 MPa, and 20 - 52 respectively. The Nast point system chart was used to classify the rocks into drilling conditions. The drilling classification shows that the drilling condition of the rocks varied from slow to fast. The drillability characteristics of the rocks vary from extremely low to medium as specified by the Drilling rate Index (DRI). It was concluded that uniaxial compressive strength, texture and grain size, drilling rate index and Equivalent Quartz Content (EQC) are important parameters affecting drilling condition of the rocks.

Comparative experimental study on physical and mechanical properties of quartz sandstone after water-cooling and natural-cooling under high temperature

2021 ◽  
pp. qjegh2020-181
Author(s):  
Haopeng Jiang ◽  
Annan Jiang ◽  
Fengrui Zhang
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Elastic Modulus ◽  
Uniaxial Compressive Strength ◽  
Heating Temperature ◽  
Physical And Mechanical Properties ◽  
P Wave ◽  
Water Cooling ◽  
Average Value ◽  
Cooling Methods

Experimental tests were conducted to study the influence of natural cooling and water cooling on the physical and mechanical properties of quartz sandstone. This study aims to understand the effect of different cooling methods on the physical and mechanical properties of quartz sandstone (such as mass, volume, density, P-wave velocity, elastic modulus, uniaxial compressive strength, etc.). The results show that the uniaxial compressive strength (UCS) and elastic modulus(E) of the specimens cooled by natural-cooling and water-cooling decrease with heating temperature. At 800℃, after natural cooling and water cooling, the average value of UCS decreased by 34.65% and 57.90%, and the average value of E decreased by 87.66% and 89.05%, respectively. Meanwhile, scanning electron microscope (SEM) images were used to capture the development of microcracks and pores within the specimens after natural-cooling and water-cooling, and it was found that at the same temperature, water cooling treatment was more likely to cause microcracks and pores, which can cause more serious damage to the quartz sandstone. These results confirm that different cooling methods have different effects on the physical and mechanical properties of quartz sandstone, and provide a basis for the stability prediction of rock mass engineering such as tunnel suffering from fire.

scholarly journals The Mechanism of Reinforced Backfill Body with Flexible Mesh

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Xiaosheng Liu ◽  
Weijun Wang ◽  
Quan Liu ◽  
Chao Yuan
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Laboratory Experiments ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Strengthening Effect ◽  
Passive Resistance ◽  
Metal Mines ◽  
Reinforcement Material

The backfill of metal mines is easily damaged by the disturbance due to their low strength. We proposed a method that uses flexible meshes as the backfill skeleton to enhance the strength of the backfill. The physical and mechanical properties of the flexible mesh-reinforced filling body are investigated by combining theoretical analysis and laboratory experiments. The strengthening effect is remarkable with the flexible meshes. With the friction-passive resistance between the high-strength reinforcement material and the filling body, the insufficient tensile strength of the filling body is compensated and the reinforcement is improved. The ultimate compressive strength is increased by 1.07 to 1.35 times, and the elastic modulus is increased by 1.08 to 4.42 times. We concluded that the essence of strengthening the flexible mesh-reinforced filling is to increase the cohesive force of the filling and increase the ability to resist external load damage.

scholarly journals Study on the Physical and Mechanical Properties of Granite After Multiple Thermal Shock Treatments

2020 ◽  
Author(s):  
Li Yu ◽  
Hai-wang PENG ◽  
Yu Zhang ◽  
GuoWei Li
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
High Temperature ◽  
Thermal Shock ◽  
Tensile Modulus ◽  
Physical And Mechanical Properties ◽  
P Wave ◽  
Water Cooling ◽  
Thermal Shocks

Abstract To study the influence of thermal shock caused by water cooling on the physical and mechanical properties of high-temperature granite, granite was subjected to an increasing number of high-temperature (300℃) water-cooling and thermal shock treatment cycles, and static mechanical experiments were carried out on the treated granite. The results support the following conclusions: (1) Thermal shock causes an increase in the number and size of the pores and cracks within the granite; thus, its volume expands, density decreases, water absorption rate increases, and P-wave velocity decreases. (2) With an increase in the number of thermal shocks, both the compressive strength and tensile strength of the granite decrease, and there is a linear relationship between the compressive strength and tensile strength. With the corresponding fitting formula, the change in the strength of the granite can be accurately predicted. (3) With an increase in the number of thermal shocks, the plasticity of the granite increases and its resistance to deformation weakens, which is manifested as a decrease in both the compressive modulus and tensile modulus of the granite. After 15 cycles of thermal shock, the compressive elastic modulus and tensile modulus of the granite decreased by 25.18% and 46.76%, respectively. (4) The m and s values of the damaged granite were calculated based on the Hoek-Brown empirical criterion, and it was found that both of these parameters decrease with the increase in the number of thermal shocks. The calculation results can provide a reference for engineering rock mass failure.Clinical trial registration

scholarly journals Stiffness and Strength of Granular Soils Improved by Biological Treatment Bacteria Microbial Cements

2018 ◽  
Vol 2 (4) ◽  
Author(s):  
Mehdi Jalili ◽  
Mohmad Reza Ghasemi ◽  
Ali Reza Pifloush
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Uniaxial Compressive Strength ◽  
Physical And Mechanical Properties ◽  
Soil Improvement ◽  
Granular Soils ◽  
Industrial Town ◽  
Strength Tests ◽  
Problematic Soils ◽  
Strength And Stiffness

In some parts of the world mechanical properties of problematic soils are not suitable for construction purposes. Today, regard to the importance of the soil improvement; by considering methods with more concordance with the environmental mechanisms in the nature, and with study and combination of geotechnical science, microbiology and geochemistry; researchers try to provide a suitable way to improve the physical and mechanical properties of the problematic soils. In this paper, the effect of the aerobic microorganisms of Sporosarsina Pasteurii (PTCC 1645), as a producer of Urease for the sedimentation of calcium carbonate and improvement of granular soil of Garmsar Industrial Town is evaluated experimentally in order to check the effects of this phenomena on the shear strength and stiffness of the granular soils. The results of the uniaxial compressive strength tests show the effect of adding the above mentioned microbial solution to the soils, in case of increased uniaxial compressive strength and stiffness of the soil. It should be mentioned that the granular soils have no compressive strength, naturally but after bio cementation the samples got notable values.

scholarly journals Influence of Rice Husk Ash on the Properties of Concrete

2016 ◽  
Vol 9 (1) ◽  
pp. 29-33
Author(s):  
MB Hossain ◽  
KM Shaad ◽  
MS Rahman ◽  
P Bhowmik
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Lightweight Concrete ◽  
Physical And Mechanical Properties ◽  
Test Results ◽  
Structural Concrete ◽  
Conventional Concrete

This research was carried out to investigate various physical properties of Rice Husk Ash (RHA) and, some physical and mechanical properties of concrete incorporating RHA in different proportions. The concrete specimens were tested at 7, 21 and 28 days after curing. Test results revealed that the specific gravity of RHA was found lower than that of sand. The density of concrete containing RHA was recorded between 80-110 lb.ft-3, which is lower than conventional concrete. Water absorption was found increasing with the increase of RHA content in concrete specimens. There were significant variations in compressive strength values of concrete containing 5%, 10% and 20% volume of RHA. The compressive strength of 5% RHA specimen was 150-200% higher than that of other specimens. Hence, upto 5% replacement of RHA could be recommended for making normal lightweight concrete. The splitting tensile strength was about 9-10% of compressive strength. It was concluded that upto 5% RHA can be used effectively in making normal lightweight concrete. The higher percentage of RHA could be used in making non-structural concrete where the strength of concrete is not concerned.J. Environ. Sci. & Natural Resources, 9(1): 29-33 2016

scholarly journals Mechanical Properties of Cement-Based Materials with Recycled Plastic: A Review

2020 ◽  
Vol 12 (21) ◽  
pp. 9060
Author(s):  
Jun Kil Park ◽  
Min Ook Kim
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Physical And Mechanical Properties ◽  
Recycled Aggregates ◽  
Split Tensile Strength ◽  
Plastic Recycling ◽  
Cement Based Materials ◽  
High Pollution ◽  
Recycled Plastics

This study summarizes existing studies on plastic recycling to determine whether ocean plastics with high pollution degrees could be used for cement-based materials. In particular, the methods to recycle plastic waste, the effects of recycled plastic on the physical and mechanical properties of cement-based materials, and their effective usage were investigated. Workability, density, compressive strength, split tensile strength, and flexural strength of cement-based materials with recycled plastics were reviewed and divided into recycled aggregates and fibers. Based on the previous investigation, the direction of research necessary to recycle marine plastics is suggested. As the amount of recycled plastic aggregate increased, the mechanical strength of cement-based materials decreased. The recycled plastic aggregate lowered the density and increased porosity of the cement-based material. Meanwhile, recycled plastic fibers reduced the compressive strength but improved the tensile strength; to effectively improve tensile strength, a volume content of less than 1.5% should be added to prevent balling fibers. Furthermore, an appropriate aspect ratio should be determined based on the type of plastic to be used.

scholarly journals Thermo-Mechanical Properties of a Wood Fiber Insulation Board Using a Bio-Based Adhesive as a Binder

Buildings ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 152
Author(s):  
Franz Segovia ◽  
Pierre Blanchet ◽  
Nicolas Auclair ◽  
Gatien Geraud Essoua Essoua
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Citric Acid ◽  
Crude Glycerol ◽  
Wood Fiber ◽  
Physical And Mechanical Properties ◽  
Acid Mixture ◽  
Wood Fibers

The goal of the present study was to develop a low-density thermal insulation board using wood fibers and a bio-based adhesive as a binder, which was prepared from a crude glycerol and citric acid mixture. The physical and mechanical properties of insulation boards manufactured using two ratios of crude glycerol and citric acid (1:0.66 and 1:1 mol/mol) and two adhesive contents (14% and 20%) were evaluated. The results show that the insulation boards with a range of density between 332 to 338 kg m−3 present thermal conductivity values between 0.064 W/m-K and 0.066 W/m-K. The effect of adhesive content was very significant for certain mechanical properties (tensile strength perpendicular to surface and compressive strength). The tensile strength (internal bond) increased between 20% and 36% with the increased adhesive content. In contrast, the compressive strength decreased between 7% and 15%. The thermo-mechanical properties obtained of insulation boards such as thermal conductivity, traverse strength, tensile strength parallel and perpendicular to surface, and compressive strength are in accordance with the requirements of the American Society for Testing and Materials C208-12 standard for different uses. The results confirm the potential of crude glycerol and citric acid mixture to be used as an adhesive in the wood fiber insulation boards’ manufacturing for sustainability purposes.

scholarly journals Influence of Basalt Fiber on the Physical and Mechanical Properties of Aerated Ceramsite Concrete

2020 ◽  
Vol 44 (6) ◽  
pp. 427-432
Author(s):  
Yonghe Yao ◽  
Yanhong Wang ◽  
Jun Xu ◽  
Yajun Hu
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Flexural Strength ◽  
Apparent Density ◽  
Basalt Fiber ◽  
Volume Ratio ◽  
Physical And Mechanical Properties ◽  
Splitting Tensile Strength ◽  
Technical Performance

In order to improve the technical performance of Aerated Ceramsite Concrete (ACC) so that it could better meet the requirements of lightweight wallboards for prefabricated buildings, this study mixed 0%, 0.05%, 0.10%, 0.15% and 0.20% of the Basalt Fiber (BF) by volume ratio into the ACC of 100mm-thickness LC15 lightweight wallboards, and conducted experiments to test the apparent density, compressive strength, splitting tensile strength, and flexural strength on the 7d, 14d, and 28d of the experiment; then, the microstructure and failure forms of the BF-improved ACC material were observed and analyzed, and the results showed that adding BF can effectively improve the physical and mechanical properties of ACC, and the optimal BF content in the ACC of lightweight wallboards is 0.10%-0.15%.

Experimental Research on Physical and Mechanical Properties of EPS Recycled Concrete

2012 ◽  
Vol 204-208 ◽  
pp. 4022-4025 ◽  
Author(s):  
Ya Xian Rao ◽  
Chao Feng Liang ◽  
Ying Xia
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Volume Content ◽  
Rate Increase ◽  
Physical And Mechanical Properties ◽  
Expanded Polystyrene ◽  
Recycled Concrete ◽  
Split Tensile Strength

In order to develop a new building material by recycling wasted concrete and expanded polystyrene (EPS), the EPS recycled concretes of different density were designed, and their basic physical and mechanical properties were studied. The results show that the EPS recycled concrete’s fluidity and saturated bibulous rate increase with the increase of EPS volume content. However, the dry apparent density, compressive strength, split tensile strength and thermal conductivity of EPS recycled concrete decrease linearly with increased EPS volume content. When the EPS volume content is 60%, the EPS recycled concrete’s cubic compressive strength is 4.0MPa and its thermal conductivity is 0.27W/m•K. Therefore, EPS recycled concrete can be widely applied to the non load-bearing lightweight insulation masonry.

Investigation of Physical and Mechanical Properties of Construction Materials of Forced Carbonate Hardening

2018 ◽  
Vol 931 ◽  
pp. 475-480 ◽  
Author(s):  
Nikolay V. Lyubomirskiy ◽  
Stanisław Fic ◽  
Sergey I. Fedorkin
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Elastic Modulus ◽  
Building Materials ◽  
Construction Materials ◽  
Physical And Mechanical Properties ◽  
Building Products ◽  
Technological Factors ◽  
Dry Pressing

A technique for determining the modulus of elasticity of сonstruction materials on samples of small dimensions has been developed. Physical and mechanical properties of building materials based on calcareous-lime compositions of semi-dry pressing, hardening according to the principle of forced carbonization, depending on the prescription and technological factors of their production have been studied. It has been demonstrated that on the basis of these materials it is possible to obtain building products with compressive strength up to 30 MPa, tensile strength at bending up to 5 MPa and higher, and an elastic modulus up to 18 GPa.

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