Stabilized Dune Sand for Road Foundation Layers - Case of the Dune Sand of the Region of Djelfa (Algeria)

2013 ◽  
Vol 319 ◽  
pp. 263-277 ◽  
Author(s):  
Ghrieb Abderrahmane ◽  
Mitiche Kettab Ratiba
Keyword(s):  
Mechanical Properties ◽  
Mechanical Characteristics ◽  
Dry Density ◽  
Dune Sand ◽  
Maximum Dry Density ◽  
Local Material ◽  
Hydraulic Binder ◽  
Current Standards ◽  
Made In ◽  
Physical And Mechanical Characteristics

The aim of the work presented in this paper is the valorisation of dune sand, which is abundant in Djelfa (Algeria). This study consists of valorizing a local material in road foundation layers. Several stages will be considered in this investigation. A method of formulation of the mixtures has been proposed, which is based on the stabilization of the studied dune sand using a hydraulic binder and a granular corrector. For each mixture, the optimum Proctor, the compressive strength with and without immersion and the tensile strength have been determined. After that an analysis of the results was made in order to examine the influence of the stabilizing agent proportioning on the physical and mechanical characteristics of mixtures. A correlation between mechanical properties of the stabilized dune sand and the maximum dry density were proposed. The stabilized sand was classified according to current standards, the optimal formulation is then selected, on which additional tests were carried out. The results obtained show that the formulation selected has sufficient performances to be used in road foundation layers.

scholarly journals SIFAT FISIKA DAN MEKANIKA KAYU JABON MERAH (Anthocephalus macrophyllus) YANG DITANAM DI WONOGIRI, 2 JAWA TENGAH

2020 ◽  
Vol 8 (3) ◽  
pp. 357
Author(s):  
Fanny Hidayati ◽  
Sri Sunarti ◽  
Teguh Setiaji ◽  
Arif Nirsatmanto
Keyword(s):  
Mechanical Properties ◽  
Mechanical Characteristics ◽  
Bending Strength ◽  
Physical And Mechanical Properties ◽  
Wood Properties ◽  
Dry Density ◽  
Improvement Program ◽  
Average Value ◽  
Central Java ◽  
Physical And Mechanical Characteristics

Red jabon is one of the fast growing species. It is growth well in tropical countries. It has a potential to fulfill the demand of wood. Tree imrovement program of this species has been done in Indonesia. However, information of wood properties related to tree improvement program of red jabon is limited. Therefore, wood properties such as physical and mechanical properties of this species at the progeny trial were needed to clarify. The aims of this research were to clarify the variation of physical and mechanical properties of red jabon from 5 families at5-year-old planted in Wonogiri, Central Java and relationship between air-dry density and mechanical properties. As the result, physical and mechanical properties were varied among 5 families. Based on the results, famili number 85 performed good result of physical and mechanical characteristics, eventhough the physical properties were not highest among 5 families but it was abouf the average value. Furthermore, this family showed the best values of all mechanichal characteristics tested. In addition, air-dry density has highly positive significantcorrelation with mechanical properties (static bending strength and compressive strength parallel to grain), suggesting that mechanical properties can be predicted by air-dried density.

Effect of MgO•Sb2O5 on Fire Resistance and Physical and Mechanical Properties of Cable PVC-Plasticate

2021 ◽  
Vol 899 ◽  
pp. 557-562
Author(s):  
Timur A. Borukaev ◽  
Luiza I. Kitieva ◽  
Abubekir Kh. Shaov ◽  
A.A. Kyarov
Keyword(s):  
Mechanical Properties ◽  
Fire Resistance ◽  
Mechanical Characteristics ◽  
Negative Impact ◽  
Physical And Mechanical Properties ◽  
Antimony Oxide ◽  
Magnesium Carbonate ◽  
Physical And Mechanical Characteristics

Based on magnesium carbonate and antimony oxide (V), MgO•Sb2O5 was obtained. In the formulation of fire-resistant cable PVC-plasticate, antimony (III) oxide was replaced by MgO•Sb2O5 and the fire resistance and physical and mechanical properties of the resulting compound were investigated. It is shown that the replacement of antimony (III) oxide in the composition of PVC cable compound MgO•Sb2O5 leads to the production of a compound that is not inferior in its characteristics to the original plastic compound. In particular, the fire resistance of cable PVC-plasticate, standard industrial formulation and with the obtained MgO•Sb2O5, is practically the same (OI=32%). It has been established that the physical and mechanical characteristics of the cable compound, when replacing antimony oxide (III) with MgO•Sb2O5 in the formulation, remain at the level of the original compound, while MgO×Sb2O5 will have a less negative impact on the environment.

Physical and mechanical characteristics of cement mortars and concretes with addition of clinoptilolite from Beli Plast deposit (Bulgaria), silica fume and fly ash

Clay Minerals ◽  
2011 ◽  
Vol 46 (2) ◽  
pp. 213-223 ◽  
Author(s):  
V. Lilkov ◽  
I. Rostovsky ◽  
O. Petrov
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Fly Ash ◽  
Silica Fume ◽  
Mechanical Characteristics ◽  
Physical And Mechanical Properties ◽  
Specific Pore Volume ◽  
Cement Mortars ◽  
Physical And Mechanical Characteristics

AbstractCement mortars and concretes incorporating clinoptilolite, silica fume and fly ash were investigated for changes in their physical and mechanical properties. It was found that additions of 10% clinoptilolite and 10% Pozzolite (1:1 mixture of silica fume and fly ash) were optimal for improvement of the quality of the hardened products, giving 8% and 13% increases in flexural and compressive strength respectively. The specific pore volume of the mortars incorporating zeolite decreased between the 28th and 180th day to levels below the values for the control composition due to the fact that clinoptilolite exhibits its pozzolanic activity later in the hydration. In these later stages, pores with radii below 500 nm increased at the expense of larger pores. The change in the pore-size distribution between the first and sixth months of hydration occurs mostly in the mortars with added zeolite.

scholarly journals Assessment of the Mechanical Properties of Sisal Fiber-Reinforced Silty Clay Using Triaxial Shear Tests

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Yankai Wu ◽  
Yanbin Li ◽  
Bin Niu
Keyword(s):  
Mechanical Properties ◽  
Failure Modes ◽  
Shear Fracture ◽  
Sisal Fiber ◽  
Dry Density ◽  
Silty Clay ◽  
Fiber Reinforced ◽  
Shear Tests ◽  
Maximum Dry Density ◽  
Sisal Fibers

Fiber reinforcement is widely used in construction engineering to improve the mechanical properties of soil because it increases the soil’s strength and improves the soil’s mechanical properties. However, the mechanical properties of fiber-reinforced soils remain controversial. The present study investigated the mechanical properties of silty clay reinforced with discrete, randomly distributed sisal fibers using triaxial shear tests. The sisal fibers were cut to different lengths, randomly mixed with silty clay in varying percentages, and compacted to the maximum dry density at the optimum moisture content. The results indicate that with a fiber length of 10 mm and content of 1.0%, sisal fiber-reinforced silty clay is 20% stronger than nonreinforced silty clay. The fiber-reinforced silty clay exhibited crack fracture and surface shear fracture failure modes, implying that sisal fiber is a good earth reinforcement material with potential applications in civil engineering, dam foundation, roadbed engineering, and ground treatment.

scholarly journals MECHANICAL PROPERTIES OF BOTTOM ASH – DREDGED MATERIAL MIXTURES IN LABORATORY TESTS

2013 ◽  
Vol 35 (3) ◽  
pp. 3-11 ◽  
Author(s):  
Lech Bałachowski ◽  
Zbigniew Sikora
Keyword(s):  
Mechanical Properties ◽  
Void Ratio ◽  
Bottom Ash ◽  
Physical And Mechanical Properties ◽  
Friction Angle ◽  
Ash Content ◽  
Dry Density ◽  
Dredged Material ◽  
Maximum Dry Density ◽  
Proctor Test

Abstract Bottom ash from EC Gdańsk and dredged material taken from the mouth of The Vistula were mixed to form an engineering material used for dike construction. Mixtures with different bottom ash content were tested in laboratory to determine its basic physical and mechanical properties. The optimum bottom ash-dredged material mixture, built in the corps of the test dike, contains 70% of ash. The optimum bottom ash content in the mixture was chosen taking into account high internal friction angle, good compaction and reduced filtration coefficient. The maximum dry density of the mixtures was measured in Proctor test for the mixtures formed in laboratory and on samples taken from the test dike. Minimum and maximum void ratio were also determined.

scholarly journals Experimental Studies on the Mechanical Properties of Loess Stabilized with Sodium Carboxymethyl Cellulose

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Hongwang Ma ◽  
Qi Ma
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Carboxymethyl Cellulose ◽  
Experimental Studies ◽  
Loess Soil ◽  
Sodium Carboxymethyl Cellulose ◽  
Dry Density ◽  
Maximum Dry Density ◽  
Split Tensile Strength

This research investigated the use of sodium carboxymethyl cellulose (CMC) as a reinforcement to improve mechanical properties of loess soil found in northwestern China. The mechanical properties of loess were determined by unconfined compressive strength and split tensile strength tests. Three different contents of CMC were adopted: 0.5%, 1.0%, and 1.5%. The results showed that utilizing CMC reduced the maximum dry density of the loess. The compressive strength, tensile strength, and Young’s modulus are enough to construct low-rise buildings when the CMC content exceeds 1.0%, based on existing standards. This research thus provides a prospective sustainability method for loess stabilization.

Study on the Physics and Mechanical Properties of Freeze-Thaw Soil and Undisturbed Soil

2012 ◽  
Vol 249-250 ◽  
pp. 1109-1111
Author(s):  
Hong Mei Wang ◽  
Yu Wang
Keyword(s):  
Mechanical Properties ◽  
Void Ratio ◽  
Mechanical Characteristics ◽  
Fine Sand ◽  
Dry Density ◽  
Plastic Limit ◽  
Ratio Increase ◽  
Undisturbed Soil ◽  
Freeze Thaw ◽  
Freezing Method

The parameter of the undisturbed soil cannot be used simply in the engineering for the characteristics varied considerably. So the physics and mechanical characteristics of freeze-thaw soil are very important in the freezing method engineering. The physics and mechanical properties of freeze-thaw soil and undisturbed soil are compared by the experiment. And the data of test are shown that after the samples are frozen and thawed, density, dry density decrease and plastic limit decrease, void ratio increase a little, other physicals are similar. Permeability of mild clay greatly increased. Compressibility of mild clay decrease, but compressibility of fine sand increase. This can be used reference to model test, numerical analysis and project designing.

Study on the Clay Mechanical Characteristics of “Ripping Up the Bottom” in the Yellow River

2012 ◽  
Vol 212-213 ◽  
pp. 108-112 ◽  
Author(s):  
Wen Sheng Dong ◽  
Xiu Fang Jiang ◽  
Xian Feng He ◽  
Ying Ying Zai
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Mechanical Strength ◽  
Water Content ◽  
Critical Condition ◽  
Mechanical Characteristics ◽  
Yellow River ◽  
The Yellow River ◽  
Dry Density ◽  
The Relationship

Aim to the high sandy river “ripping up the riverbed” phenomenon, by experiment, analyzing the relationship between clay dry density, water content, plasticity index and its shear strength, and its mechanical properties. Create the conditions for studying clay mechanical strength and the critical condition of “bottom tearing scour”.

Study on the Physics and Mechanical Properties of Freeze-Thaw Soil and Undisturbed Soil

2012 ◽  
Vol 490-495 ◽  
pp. 2752-2754
Author(s):  
Guang Wei Zhao ◽  
Jing Hui Dai
Keyword(s):  
Mechanical Properties ◽  
Void Ratio ◽  
Mechanical Characteristics ◽  
Fine Sand ◽  
Dry Density ◽  
Plastic Limit ◽  
Ratio Increase ◽  
Undisturbed Soil ◽  
Freeze Thaw ◽  
Freezing Method

The parameter of the undisturbed soil cannot be used simply in the engineering for the characteristics varied considerably. So the physics and mechanical characteristics of freeze-thaw soil are very important in the freezing method engineering. The physics and mechanical properties of freeze-thaw soil and undisturbed soil are compared by the experiment. And the data of test are shown that after the samples are frozen and thawed, density , dry density decrease and plastic limit decrease, void ratio increase a little, other physicals are similar. Permeability of mild clay greatly increased. Compressibility of mild clay decrease, but compressibility of fine sand increase. This can be used reference to model test, numerical analysis and project designing.

scholarly journals Study of water salinity effect on geotechnical behavior of soil structure using response surface method (RSM), (Case study: Gotvand Dam)

2015 ◽  
Vol 37 ◽  
pp. 350
Author(s):  
Mohammad Ajam ◽  
Mohammad Reza Sabour ◽  
Gorban Ali Dezvareh
Keyword(s):  
Response Surface ◽  
Mechanical Characteristics ◽  
Liquid Limit ◽  
Atterberg Limits ◽  
Water Salinity ◽  
Dry Density ◽  
Maximum Dry Density ◽  
Salinity Effect ◽  
Khuzestan Province ◽  
Weight Percentage

Specifying the mechanical characteristics of soil is as one of the major steps in designing the foundation for civil projects, particularly hydraulic structures. This study examines the water salinity effect on engineering characteristics of fine-grained soil in clayey core of Gotvand dam which it is located on the Karun River in Khuzestan province, Iran. For this purpose, three types of salt; sodium chloride, magnesium chloride and calcium sulfate is considered that the last one has the highest concentration in the water of reservoir behind the dam, and then their effect on the mechanical characteristics of clay including density, Atterberg limits, angel of internal friction, adhesion and open inflation have examined. Therefore, treatments required for testing were provided by combining the mentioned salts considering the weight percentage of salt in the water behind the dam and designing a test using response surface methodology (RSM). The results were statistically analyzed by RSM. Results showed that type and amount of soil salinity has no significant impact on the compaction characteristics of soil namely optimum moisture content and the maximum dry density. Results of changes in Atterberg limits showed that presence of salt ions reduces the plasticity of the soil and it was seen a certain decrease in the liquid limit and subsequently a dramatic drop in soil plasticity by increasing the percentage of soil; while the plastic limit remained almost unchanged. Eventually, results of open inflation showed that whatever the salt concentration be higher, the rate of sample's open inflation will be lower.

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