Mechanical properties of waterwork sludges – shear strength

1997 ◽  
Vol 36 (11) ◽  
pp. 43-50 ◽  
Author(s):  
Knut Wichmann ◽  
Andreas Riehl
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Water Source ◽  
Capillary Suction ◽  
Treatment Processes ◽  
Influence Of Water ◽  
Environmentally Safe ◽  
Measurement Devices ◽  
Almost All ◽  
Water Contents

In order to ensure a regular and environmentally safe utilization and disposal of waterwork sludges especially the mechanical properties must be controlled. Monitoring of the mechanical properties is of great importance to almost all treatment, utilization and disposal operations. Depending on the raw water source and the treatment processes, different types of waterwork sludge can be described. The first step of this research project included the collection of data from literature reports, information about measuring methods on rheological and soil mechanical parameters and preliminary measurements on selected waterwork sludge samples. Measurement of vane shear strength is a method used in the field of waste disposal/landfill in Germany. Therefore this method was the main topic of the first investigations. Aims were to examine: 1. Influence of water contents and dewatering capacity on shear strength. 2. Correlation between laboratory and field measurement devices. Sludge samples from different waterworks were investigated with following devices: laboratory vane shear apparatus, pocket vane apparatus, pocket penetrometer and capillary suction time measuring.

Influence of Water Contents on Shear Strength of Rammed Earth Wall of Earth-Building

2011 ◽  
Vol 382 ◽  
pp. 172-175
Author(s):  
Ren Wei Wu ◽  
Xing Qian Peng ◽  
Li Zhang
Keyword(s):  
Shear Strength ◽  
Water Content ◽  
Triaxial Compression ◽  
Friction Angle ◽  
World Heritage Site ◽  
Rammed Earth ◽  
Compression Tests ◽  
Rammed Earth Wall ◽  
Influence Of Water ◽  
Water Contents

As the "Fujian earth-building" have been inscribed by UNESCO in 2008 as World Heritage Site, attentions of protection about the "Fujian earth-building" has getting more and more. This article takes samples of a rammed-earth wall from Yongding earth-buildings and determines the shear strength of the samples with different water content through triaxial compression tests. The influence on shear strength of water content of rammed-earth samples is analyzed. Test results show that the shear strength of rammed-earth has much to do with the water content of the soil, the greater the water content is，the smaller the shear strength is. With water content increasing, cohesion and internal friction angle of rammed-earth were decreases, and its changing trend is of marked characteristic of stage. When water contents of rammed-earth is under some value, its cohesion changes in small ranges; when water contents of rammed-earth is over the value, its cohesion decreases with water content increasing.

scholarly journals Experimental Investigation on the Influence of Water Content on the Mechanical Properties of Coal under Conventional Triaxial Compression

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Meichang Zhang ◽  
Rongshan Nie
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Internal Friction ◽  
Water Content ◽  
Triaxial Compression ◽  
Friction Angle ◽  
Conventional Triaxial Compression ◽  
Influence Of Water ◽  
Confining Pressures ◽  
Water Contents

The presence of water is one of the most important factors in coal mining, and it has a dual influence on the mechanical behavior of rock. To study the influence of water content on the mechanical properties of coal under complicated stress conditions, dry coal specimens and wet coal specimens with water contents of 1.8% and 3.6% were conducted by uniaxial and conventional triaxial compression tests. The relations between the uniaxial compressive strength, deformation, and water content were observed. The reductions in the strength and elastic modulus under different confining pressures were obtained. The mechanical properties of coal specimens with different water contents under triaxial compression were studied. The influences of water content on the microstructure, clay minerals, internal friction angle, and cohesive force of coal were discussed. The results show that the strengths and elastic moduli of wet specimens are clearly lower than those of dry specimens under different confining pressures. The water content has a significant influence on the postfailure mechanical behavior of coal. The loss rates of strength and elastic modulus decrease with increasing confining pressure. The water content has almost no effect on the internal friction angle, while the cohesive force of the saturated specimens is 36.5% lower than that of the dry specimens. The results can provide a reference for inhibiting the occurrence of disasters during coal mining and exploiting coal efficiently.

Changing of Contaminants Content and Disperse State during Treatment and Transportation of Drinking Water

2014 ◽  
Vol 587-589 ◽  
pp. 573-577 ◽  
Author(s):  
Maria Ju. Andrianova ◽  
Ludmila M. Molodkina ◽  
Alexander N. Chusov
Keyword(s):  
Drinking Water ◽  
Water Distribution ◽  
Colloidal Particles ◽  
Tap Water ◽  
Water Contaminants ◽  
Disperse State ◽  
Treatment Processes ◽  
Influence Of Water ◽  
Almost All ◽  
Corrosion Of Steel

Number concentration of colloidal particles and concentration of several drinking water contaminants (iron, aluminium, AOX) were determined in river water, water treated at WTP, tap water and their filtrates (pore diameter of filter 60 nm). It was shown that almost all AOX were present in highly disperse state (less than 60 nm), 55...90% of iron and 55...80% of aluminium belonged to impurities with size over 60 nm. Changes of contaminants state and concentration were explained by influence of water treatment processes and corrosion of steel water distribution pipes.

scholarly journals INFLUENCE OF THE ACTIVITY OF DYNAMIC LOADING BY CONCRETION MASS FALLING ON THE HOLOCENE SEDIMENTS IN BINH CHANH-DISTRICT 8 HO CHI MINH CITY

2011 ◽  
Vol 14 (4) ◽  
pp. 5-16
Author(s):  
Hoang Minh Truong ◽  
Minh Phat Nguyen ◽  
Thanh Dinh Nguyen ◽  
Bao Tieu Truong
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Dynamic Loading ◽  
Liquid Limit ◽  
Ho Chi Minh City ◽  
Soft Ground ◽  
Disturbed Soil ◽  
Holocene Sediments ◽  
Depth Of Investigation ◽  
Water Contents

The Holocen sediments 3 2 Q and 2 3 2 Q - in Ho Chi Minh City, the thickness is 36.5m, always under the ground water table. The water contents, Wn, are more than the liquid limit. Present, the activity of dynamic loading of traffic, factories have being developed, especially shaking of earthquake in a few years ago, that unit now no research results about this matter. The first work studies about influence of the activity of dynamic loading caused by a concretion mass on the mechanical properties. Survey field shear strength of the soft ground in undisturbed and disturbed soil ground caused by the concretion mass. The depth of investigation is arange of 0.0 to 10 m. Results, the sensitivitis of Holocene sediments be from medium sensitivity to medium quick.

INFLUENCE THE QUENCHING AND TEMPERING ON THE MICROSTRUCTURE, MECHANICAL PROPERTIES AND SURFACE ROUGHNESS, OF MEDIUM CARBON STEEL

2018 ◽  
Vol 18 (1) ◽  
pp. 125-135
Author(s):  
Sattar H A Alfatlawi
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Surface Roughness ◽  
Carbon Steel ◽  
Cold Water ◽  
Medium Carbon Steel ◽  
Medium Carbon ◽  
Heating And Cooling ◽  
Treatment Processes ◽  
Quenching And Tempering

One of ways to improve properties of materials without changing the product shape toobtain the desired engineering applications is heating and cooling under effect of controlledsequence of heat treatment. The main aim of this study was to investigate the effect ofheating and cooling on the surface roughness, microstructure and some selected propertiessuch as the hardness and impact strength of Medium Carbon Steel which treated at differenttypes of heat treatment processes. Heat treatment achieved in this work was respectively,heating, quenching and tempering. The specimens were heated to 850°C and left for 45minutes inside the furnace as a holding time at that temperature, then quenching process wasperformed in four types of quenching media (still air, cold water (2°C), oil and polymersolution), respectively. Thereafter, the samples were tempered at 200°C, 400°C, and 600°Cwith one hour as a soaking time for each temperature, then were all cooled by still air. Whenthe heat treatment process was completed, the surface roughness, hardness, impact strengthand microstructure tests were performed. The results showed a change and clearimprovement of surface roughness, mechanical properties and microstructure afterquenching was achieved, as well as the change that took place due to the increasingtoughness and ductility by reducing of brittleness of samples.

ALUMINUM 220

Alloy Digest ◽  
1962 ◽  
Vol 11 (3) ◽  
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Shear Strength ◽  
High Temperature ◽  
Heat Treating ◽  
Casting Alloy ◽  
Aluminum Casting ◽  
Aluminum Casting Alloy ◽  
Temperature Performance ◽  
Aluminum Company

Abstract ALUMINUM 220 is a 10% magnesium-aluminum casting alloy having the highest combination of mechanical properties, corrosion resistance and machinability. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive and shear strength as well as fatigue. It also includes information on high temperature performance and corrosion resistance as well as casting, heat treating, machining, and joining. Filing Code: Al-112. Producer or source: Aluminum Company of America.

ALUMINUM 2011

Alloy Digest ◽  
1978 ◽  
Vol 27 (12) ◽  
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Shear Strength ◽  
High Temperature ◽  
Physical Properties ◽  
Copper Alloy ◽  
Heat Treating ◽  
Temperature Performance ◽  
Screw Machine ◽  
Aluminum Copper Alloy

Abstract ALUMINUM 2011 is an age-hardenable aluminum-copper alloy to which lead and bismuth are added to make it a free-machining alloy. It has good mechanical properties and was designed primarily for the manufacture of screw-machine products. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and shear strength as well as fatigue. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Al-32. Producer or source: Various aluminum companies. Originally published October 1955, revised December 1978.

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