Finally reviewing all the results it was concluded that concrete mixes with 6% micro silica and 8% metakaolin over 35% fly ash as base were the better mixes among all because compressive strength which is one of the key property of concrete obtained in these two mixes for M-30 grade concrete were close to or rather slightly higher than 30MPa. More over filling ability, passing ability and blocking ratio as obtained on other mixes were also well within the limits but were slightly on a higher side which may give rise to problem of segregation which is undesirable. Therefore studying all the test results we conclude the above two trials as the better amongst
With increase of C-S-H, the interconnected pore structures of mortar are filled of it. Fly ash reduces the permeability of concrete to water and gas provided the concrete is adequately cured . Figure 7 indicate relative sorptivity value against curing age. It was almost same pattern as figure 8. It was observed that 10% of fly ash replacement in 28 days has greatest increases of sorptivity value which is 44% from 7 days.
However, most countries as of now do not recycle a large percentage of the concrete; with the leaders being Netherlands and UK both countries which have a consumption of recycled aggregate above 20% (Jahren, 2013). This is not all, according to Jahren, other materials such as used tires and glass can be used as aggregate in concrete for both functional and aesthetically pleasing results. Researchers have presented preliminary results of using different materials from wasted plastic as light weight aggregate in concrete to hemp and even slag from lead production. (Jahren, 2013).
Class F fly ash are obtained from Hangzhou Yi-solid New Material Technology Co., Ltd. China, used as a based materials. Distilled Water, Polyvinyl Alcohol (PVA) fibers, Sodium Hydroxide (NaOH), Liquid sodium silicate (Na2SiO3), Magnesium Sulphate (Mg2SO4) and silica nanoparticles (30±5 nm) were purchased from Macklin, China. To execute this study, natural sand having less than 0.5mm particle size and 2.52 value of fineness modulus was employed. All the chemicals used were analytical grade. Sample preparation: To prepare the alkali activator 10M NaOH was mixed with Na2SiO3 solution in the weight ratio of 1:2.
Alkali aggregate reaction The amount of pozzolona needed for reducing the alkali aggregate expansiondepends on the reactivity of pozzolona.studies have shown that less than 10% of silica fume is found adequate for thispurpose as compared to fly ash whichrequires 30%-40% replacement High Strength Concrete High Performance Concrete (HPC)enhanced with silica fume is so strong itbecomes an economical alternative tosteel. Besides providing architects andengineers with greater design flexibility,there is more usable space, since smaller columns and beams can be used in highrise buildings and long span structuraldesigns. Other
The optimized ratios of the polymers were calculated by using 22 factorial design. (Table 1). Ethyl cellulose (2gm) was dissolved in 20 ml of methylene chloride2. The polymer phase of ethyl cellulose was then added to 250 ml of 0.25% w/v methylcellulose aqueous solution (over night dispersion). Agitation speed was maintained at 350 rpm which helps in complete removal of methylene chloride.
Also, the use of coal as fuel for firing purpose. The company is to reduce its carbon emission. This can be improved by making use of new low CO2 binders in the production of cement. Building upon technology and operational expertise from some European cement plants, particularly those in Germany, by upgrading the kiln design at plants to reduce their consumption of traditional fossil fuels and allow for broader fuel compatibility. Recognizing that there are a number of issues involved with the diversion of solid waste for fuel including community education, permitting, and transportation.
So according to Mr. Ahmad Mujahid the use of demolished concrete pavement as recycled aggregate and the advantages of recycling aggregate concrete in construction industry are of large values and environmental issue. RCA widely used accepted that there significant potential for reclaiming and recycling demolished debris for use value added application to maximum economic and environmental benefit and according to the Prof. Chetna M. Vyas after detailed study and analysis find to the early compressive strength of concrete made of natural aggregate and recycled concrete aggregate is approximately same under dry condition and tensile strength was also improved. So we can used to both of analysis something new to added material that is light weight and economic. Fiber and improved to the strength of
In our present investigation, Ti-6Al-4V and SS304L materials were joined by friction welding process using interlayer techniques. In this study, optimum process parameters are analyzed for better weld strength. Key words: Friction welding, welding parameters, Ti6Al4V, SS304L, Copper, Interlayer. 1. Introduction Joints of dissimilar metal combination are popular in recent years in the field of special applications like Automotive, aerospace, defence, marine etc., the joining of dissimilar metal by solid state welding is widely preferred in such situation.
This means that each and every solar cell that we will get a constant supply of light from the sun. the solar cells play an vital role as the iron in the cells help in more heat absorption. The residential torus and the agricultural torus – the cells used here are different as the silicon iron ratio is now 60:40. We have done this because the energy consumption in the residential and agricultural toruses are less then the other components of the craft. Peltier effect- this system consists of specifically placed mirrors and dense laser beams.