itm university naya raipur, raipur,unit ± iv : runoff : source and components of run roff, classification of streams, factors affecting and area velocity method. hydro rgraphics: flood hydrology, definition, typical flood hydrograph and its components, base flow and base flow separation, unit hydrograph, theory, s rcurve and its use, instantaneous uhg..semester – iv,separation, types of separators, size of screens, sieve analysis, wind erosion - factors affecting wind erosion, mechanics of wind erosion, soil loss estimation, wind erosion control transformer: principle of working, construction of single phase transformer, emf equation, transformer on.grouting of pre/post tensioned cable ducts - concrete,the water/cement ratio should be as low as possible, consistent workability. this ratio should not normally exceed 0.45. the properties of the grout mix should be tested in a laboratory depending on the facilities available before the grouting process is undertaken. tests.volume 6, issue 6 - impact factor,it is a method of countering a problem which unfortunately gets more severe in high strength concrete owing to a greater cement ratio and a correspondingly lower water cement ratio. to make matters worse the water which gets used up during the desiccation process leaves behind empty pores which lead to shrinkage stresses which prevents concrete from achieving its maximum achievable strength..
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separation: the ground and dried material is lifted up with the drying gases. in the separator, the too coarse particles (tailings) are rejected to the grinding table. the fines leave the mill and are conveyed to dust collector. drying: the process air consists mostly of waste gas from a kiln or cooler or is supplied by a hot gas generator.
maintaining a constant water-cement ratio—can result in equal or reduced compressive strength, and can increase slump loss by a factor of two or more (whiting and dziedzic 1992). water reducers decrease, increase, or have no effect on bleeding, depending on the chemical composition of the admixture. a reduction of bleeding can result in finishing
(water-cement ratio) generally begins with thin slurry and changes to thick slurry gradually. in the filling period, the grouting hole often contains all kinds of width of crack. in order to make the fissure be grouted sufficiently, it is better to use low viscosity thin slurry firstly so as to meet the needs of small crack.
request pdf | factors affecting waterproof efficiency of grouting in single rock fracture | using a transparent fracture replica with aperture size and water-cement ratio (w/c), the factors
some of the factors affecting segregation: –larger maximum particle size (25mm) and proportion of the larger particles. –high specific gravity of coarse aggregate. –decrease in the amount of fine particles. –particle shape and texture. –water/cement ratio. segregation
factors affecting segregation and bleeding : i. inaccurate water cement ratio ii. improper mixing iii. more height of concrete placing iv. excessive or over vibration define workability and list four factors affecting workability. workability: it is the ability of concrete for its easy handling in
two factors that mainly affected the compressive strengths of the samples were selected: sodium silicate to sodium hydroxide ratio (three levels 1.5, 2.5 and 3.5) and fa/alkaline solution ratio
factors affecting strength of concrete - the . 17-04-2013 concrete strength is affected by many factors, such as quality of raw materials, water/cement ratio, coarse/fine aggregate ratio, age of concrete, compaction of concrete, temperature, relative humidity and
this paper aims to study the factors that influence the properties of shell lime mortar. laboratory tests were conducted on shell lime samples to investigate the properties of shell lime mortar and the influences of the water-lime ratio, sand-lime ratio, curing ages, and the addition of glutinous rice.
explain the working principle, instrumentation, application and limitations of any three spectroscopy techniques in details with neat sketches. (3×5=15) 7. write a short note on testing procedure for the followings a. oxygen permeability test (2) measures the pressure decay of oxygen passed through an oven dried, 30 mm thick slice of a 70mm
predrainage of coalbed gas by underground drilling is one of the main approaches for eliminating gas disasters in coal mines. owing to the unsatisfactory sealing effect of conventional sealing materials, coalbed gas drainage boreholes face serious air leakage, resulting in a relatively low concentration of the drained gas. this study presents a new grouting solidification method for sealing
law- permeability — factors affecting permeability — laboratory determination soils — in-situ ough eories for variation of vertical stress under point load along the vertical and horizontal plane, and newmark's influence chart for irregular areas. compaction: mechanism of compaction — factors affecting
state factors affecting workability of concrete (any four) and explain any one. factors affecting workability of concrete: 1) water -cement ratio of concrete 2) size of aggregate 3) shape of aggregate 4) surface texture of aggregate 5) method of mixing of concrete 6) grading of aggregate 7) water absorption of aggregate 8)
cement-based material is a multiphase composite with randomly distributed internal cracks and congenital defects .fracture mechanics is the most efficient approach to study material behavior in structure and provide rational basis for stability analyses of cracks, and further service performance, safety assessment and prevention , .rilem , , , astm , , and dl/t have formulated standards as
honeycombing in concrete looks like the honeycomb (honey bees nest).if the honeycomb is present in the surface of the structure, then it can be detected as soon as we remove the shuttering and if the honeycomb is present inside the mass concrete, then it requires advanced techniques like ultrasonic testing for its detection.
3. fresh concrete : workability ± factors affecting workability ± measurement of workability by different tests ± effect of time and temperature on workability ± segregation and bleeding ± mixing and vibration of concrete ± quality of mixing water. hardened concrete : water/cement ratio-abram ¶s law ± gel space ratio ±
according to the range of analysis results of slurry water separation rate, the water-cement ratio is the most important factor affecting the water separation rate of single slurry a and b, followed by the content of bentonite, and finally the content of fly ash. the optimal combination is a 1 c 3 b 1.
concrete structures, floors, doors and windows, roofs, finishing works, water proofing. 2. strength of materials: stresses, strains, principal stresses, bending moments, shear forces and torsion theory, bending theory of beam, deflection of beam, theories of buckling of columns. 3.
126.96.36.199 the durability of structural concrete shall be related to permeability, absorption, diffusion and resistance to physical and chemical attacks in the given environment. a low water/cement-binder ratio is generally required in order to obtain adequate durability. the concrete shall normally have a water/cementbinder ratio not greater than 0.45.
momentum correction factors – chezy’s, manning’s; and bazin formulae for uniform flow – most economical sections. critical flow: specific energy-critical depth – computation of critical depth – critical sub-critical and super critical flows. open channel flow ii: non uniform flow-dynamic equation for g.v.f., mild, critical, steep,
factors affecting evaporation, estimation of evaporation, measurement of evaporation. 6 total 48 recommended books: 1. a textbook of hydrology, dr. p. jaya rami reddy, university science press. 2. engineering hydrology, k subramanya, tata mcgraw-hill education. 3. introduction to hydrology, warren viessman; gary l lewis. 4.
factors affecting slump • water cement ratio w/c = weight of water / weight of cement • constant cement content – increase water content • increase slump • no good 54. factors affecting slump •paste content low paste content harsh mix high paste content rich mix 55. ball bearing effect-start starting height 56.
forms were of wood and masonite, and were held to close tolerances to avoid wide inaccuracies in final displacement. concrete was composed of stone or gravel aggregate, with about 8.4 bags of cement per yard and a water-cement ratio of five gallons per bag of cement to secure maximum density and a 28-day strength of more than--218--
order derivatives – hamilton’s principle – lagrange’s equations. unit-ii numerical methods: eigen values and eigen vectors – general method – power method, spectral method. numerical solution of ordinary differential equations -
view fresh concrete and admixtures.doc from matlab 1234 at r v s college of engineering and technology. department of civil engineering r v college of
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although chlorides are directly responsible for the initiation of corrosion, they appear to play only an indirect role in the rate of corrosion after initiation. the primary rate-controlling factors are the availability of oxygen, the electrical resistivity and relative humidity of
this research work is a humble attempt to figure out and analyse the major factors which prompt the grower to adopt the above mentioned technology package. eighty growers, both adopter and non-adopter of the technology package, were selected as sample and