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.

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.

Durability of BFRP and Hybrid FRP Sheets under Freeze-Thaw Cycling

2010 ◽  
Vol 163-167 ◽  
pp. 3297-3300 ◽  
Author(s):  
Jia Wei Shi ◽  
Hong Zhu ◽  
Zhi Shen Wu ◽  
Gang Wu
Keyword(s):  
Mechanical Properties ◽  
Test Data ◽  
Mechanical Characteristics ◽  
Test Results ◽  
Freeze Thaw ◽  
Frp Composites ◽  
Test Parameters ◽  
The Stability ◽  
Better Than

Coupon tests were conducted to investigate the mechanical characteristics of basalt FRP (BFRP) sheet, basalt-carbon hybrid FRP sheets and the corresponding epoxy rein under the effect of freeze-thaw cycling. FRP sheets and epoxy rein coupons were subjected to up to 200 and 250 freeze-thaw cycles respectively. Test parameters included the number of freeze-thaw cycles and the types of FRP composites. Test results show that (1) BFRP sheet perform better than CFRP or GFRP sheets under high freeze-thaw cycles; (2) exposed hybrid FRP sheets not only show very little loss in mechanical properties, but also contribute to the stability of test data; (3) mechanical properties of rein epoxy decrease significantly with increasing freeze-thaw cycles.

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.

Preliminary Approach to Mechanical Characteristics of Cement Mixed Superfine Iron Tailings

2011 ◽  
Vol 299-300 ◽  
pp. 718-721
Author(s):  
Bao Kuan Ning ◽  
Jin Meng ◽  
Yi Nan Ren ◽  
Tong Jiang ◽  
Xiao Lei Cui
Keyword(s):  
Mechanical Properties ◽  
Frost Resistance ◽  
Mechanical Characteristics ◽  
Cement Mortar ◽  
Deformation Curve ◽  
Experiment Data ◽  
Freeze Thaw ◽  
Different Ages ◽  
Series Of Experiments

A large number of specimens with different contents of cement mixed superfine tailings, which took superfine iron tailings as aggregate, were produced to carry out a series of experiments on the mechanical properties of different ages and freeze-thaw cycling tests. The strength, load -deformation curve, frost resistance and other performances of cement mixed superfine tailings were obtained. The experiment data were compared with cement mortar and cement-mixed soil ones under the same conditions. The results are listed as follows: on even ground, the strength of cement-superfine tailings can be 4-6 times higher than that of cement-mixed soil, and about 10% lower than that of cement mortar; the relation of load-deformation and the characteristics of freeze-thaw cycles are basically the same as cement mortar under the same conditions.

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”.

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.

Study on Influence of Freeze-Thaw Cycles on the Physical-Mechanical Properties of Loess

2012 ◽  
Vol 442 ◽  
pp. 286-290
Author(s):  
Gui Quan Bi
Keyword(s):  
Mechanical Properties ◽  
Water Content ◽  
Water Distribution ◽  
Early Stage ◽  
Frozen Soil ◽  
Dry Density ◽  
Freeze Thaw ◽  
Thaw Cycle ◽  
Freeze Thaw Cycle ◽  
Filling Water

Loess foundations in seasonally frozen soil region are subject to severe effect of freeze-thaw cycles. This often results in water redistribution and structure weakening. So it is very important to study the physical-mechanical properties of loess under freeze-thaw cycles. In this paper, systematic study was carried out using freeze-thaw cycle machine. The impacts of freeze-thaw cycles on the physical-mechanical properties of loess including deformation, water distribution and dry density under the condition of filling water to loess samples were investigated. The results proved that the freeze-thaw cycles can increase the water content gradually from the bottom to the top in the loess samples under water supplied condition. The water content gradient reaches maximum at the freeze-thaw interface. The loess samples deform sharply at the early stage of the freeze-thaw cycles and then reach a stable status. The freeze-thaw cycles decrease the dry density of the loess samples gradually. The dry density at the top is lower than that at the bottom, due to more severe freeze-thaw effect at the top of the samples.

Experimental investigation into non-collapsible loess-like soil's engineering geological properties under the influence of freeze–thaw cycles

2020 ◽  
Vol 53 (4) ◽  
pp. 579-586
Author(s):  
Zongfang Chen ◽  
Huie Chen ◽  
Xiaoqing Yuan ◽  
Qing Zhang
Keyword(s):  
Fine Particles ◽  
Particle Diameter ◽  
Soil Samples ◽  
Dry Density ◽  
Initial Water Content ◽  
Collapse Mechanism ◽  
Undisturbed Soil ◽  
Freeze Thaw ◽  
Microscopic Evaluation ◽  
Engineering Geological Properties

Recurrent freeze–thaw cycling is a powerful weathering process that subjects soil to frost heave and thaw settlement. The cycling significantly changes the soil structure and leads to particle recombination, ultimately causing deterioration of the soil's properties. Herein, we investigated the effect of freeze–thaw cycles on loess-like soil in seasonally frozen regions; specifically with respect to the engineering geological properties, such as changes in grain-size distribution, liquid–plastic limit and collapse behaviour. The results indicate that over the course of 20 freeze–thaw cycles, the soil samples’ dry density decreased, the particle diameter of each soil fraction changed in a bi-directional manner (large particles were broken into finer sizes and fine particles agglomerated into larger particles), and the liquid limit and plasticity index first increased and then decreased. An increase in the initial water content resulted in more significant changes. In contrast to the undisturbed soil samples, the freeze–thaw cycles caused non-collapsible remoulded loess-like soil to collapse. Furthermore, microscopic evaluation allowed us to determine the collapse mechanism. Essentially, after the freeze–thaw cycles, the quantity of micropores in the soil decreased, whereas that of medium pores and macropores significantly increased. In addition, a trellis structure, similar to the typical loess structure, was generated.

Study on Material Physical and Mechanical Characteristics Tests on Tailing Dam

2013 ◽  
Vol 353-356 ◽  
pp. 1116-1121
Author(s):  
Shu Ran Lv ◽  
Yuan Yuan Zhang
Keyword(s):  
Void Ratio ◽  
System Analysis ◽  
Mechanical Characteristics ◽  
Characteristic Curve ◽  
Physical And Mechanical Properties ◽  
Dry Density ◽  
Object A ◽  
Tailing Dam ◽  
Static Triaxial Test ◽  
Physical And Mechanical Characteristics

The article takes tailings dam material as study object. A series tests, including particles analysis test, density test, seepage test, static treaxial test and compression test were conducted to analyze the physical and mechanical properties of heap dam materials. The characteristic curve and data were received. The result can system analysis the deformation laws of dam material. Experiments show that the compression coefficient of tailings is sensitive to void ratio. Through analysis of the strength parameters of the tailings in static triaxial test, it is known that the tailings cohesion can be neglected as 0 and the change of dry density has a larger influence on strength of tailings material.

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