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·Concrete mixtures to be examined were made in the laboratory using the following materials cement gravel plasticizer rice husk ash sand and MS powder Influence of curing time on the chloride penetration resistance of concrete containing rice husk ash a technical and economical feasibility study Cem Concr Compos 32 2010 pp
·Romans had used a strong cement like mortar by adding the dust of volcanic tuff volcanic ash or pumice stone into slaked lime which they called pozzolana [1] This mixture was a special cement that could be hardened under the water Modern cement named Portland cement was discovered in 1824 by using kiln dried milled limestone and clay
·Magnesia should not be present more than 2% in cement Excess magnesia will reduce the strength of the cement Iron oxide Chemical formula is Fe 2 O 3 Iron oxide imparts color to cement It acts as a flux At a very high temperature it imparts into the chemical reaction with calcium and aluminum to form tricalcium alumino ferrite
concrete mixtures incorporating copper tailings at 0% 5% and 10% addition levels were also prepared These mixtures were identified as C0 for control C5 and C10 for mixtures containing copper tailings On completion of casting operations specimens were kept in the curing room for 24 hours before they were then de molded and left in
Cement is a key ingredient of concrete typically making up 10 to 15 percent of the concrete mix by volume Portland cement and portland limestone cement are the most common types of cement used in concrete In concrete a paste made of cement and water is mixed with aggregates sand gravel or crushed stone
Initially at 1 day all blended cement mixtures showed lower compressive strength than the pure cement because of the reduced clinker content This strength reduction was more evident as the total replacement rate increased For the mixtures containing the same type of CFA the normalized CO 2 emission was only slightly reduced at higher
·Impact resistance of Portland cement concrete PCC is an essential property in various applications of PCC such as industrial floors hydraulic structures and explosion proof structures Steel fiber fortified high strength concrete testing was completed using a drop weight impact assessment for impact strength One mix was used to manufacture 320 concrete disc
·This experimental research was carried out to assess durability performance of concrete containing RBCA For this purpose eight concrete mixtures were produced which contained 0% 15% 30% and 50% of RBCA as natural coarse aggregate NCA replacement by volume with two water cement ratios w/c of and This research evaluated and
Heavyweight concrete having unit weight above 2600 kg/m3 has wide applications that include radiation shielding offshore and ballasting of pipelines etc In this study high performance heavyweight concrete mixtures were developed utilizing industrial byproducts as high density coarse aggregates These heavyweight coarse aggregates included steel slag steel shots
·The effects of water/binder ratio and temperature on hydration heat and properties of ternary blended cement containing slag and iron tailing powder were investigated The hydration heat was determined by isothermal calorimeter The Ca OH 2 content of ternary hardened paste was obtained based on the thermogravimetric results The microstructure and
·Today cement and concrete are some of the most consumed materials after water throughout the whole world About billion tons of cement are fabricated annually half a ton per person and half of this amount is produced by China [5] In addition >1 m 3 of concrete per person is produced with Portland cement each year [6] Today Portland cement Portland
·BFS is a by product of blast furnaces iron production which is a mixture of iron ore coke and limestone Cwirzen 2020; Amin et al 2017 Ternary concrete mixtures containing ground granulated blast furnace slag and fly
·This paper presents an experimental investigation on the performance of cement stabilized recycled mixture containing recycled concrete aggregate RCA and crushed brick RCB which are separated from recycled aggregate Firstly basic material performance tests were conducted to establish a comparison among natural aggregate and recycled
·For all formulations cement mortars were prepared with the cited replacement ratios containing 300 g of material The cement mortars were placed in Styrofoam boxes wrapped in glass wool blankets making these boxes thermally insulated from one another 3 specimens were prepared for each mixture in which K type thermocouple cables connected
·Concrete composites containing NG with higher w/c ratio green bars show similar compressive strengths to other mixtures at the proportion of 1 wt% and 3 wt% but much lower strengths at 5 wt%; this lower strength reflects the fact that a high w/c ratio has a significant negative influence on the concrete compressive strength due to the
Identify the following combinations as heterogeneous mixtures or homogenous mixtures soda water Carbon dioxide is dissolved in water a mixture of iron metal filings and sulfur powder Both iron and sulfur are elements Figure PageIndex{4} A mixture of iron filings and sulfur powder Asoult Fe S mixture 03 CC BY Solution
·This observation in conjunction with the XRD results Fig 5 a further validated that the broad peak at around ° was mainly attributed to monocarbonate in cement pastes containing limestone while to hydrotalcite like phase in magnesite containing mixtures
·High strength concrete HSC containing % macro polymeric MP fiber and 3% nS showed a 29% increase and concrete containing % PP % MP and 3% nS showed a 25% increase in strength While the HSC containing only 3% nS showed an improvement of 16% tensile strength compared to plain concrete [69]
·[1] Ismail Z Z and Al Hashmi E A 2008 Reuse of waste iron as a partial replacement of sand in concrete[J] Waste Manage 28 2048 2053 Google Scholar [2] Evangelista L and Brito J 2010 Durability performance of concrete made with fine recycled concrete aggregates[J] Cem Concr Compos 32 9 14 Google Scholar [3] Liu J Ni W and Yu M 2012
·Besides cement concrete the usage of recycled aggregate in asphalt mixture also had been studied Hanaa et al [17] investigated the effect of recycled concrete aggregate on asphalt mixture s performance It is found that the mixture with two type untreated recycled aggregate have higher rutting resistance and stiffness modulus compared with
·Correlation between actual compressive strength and rebound hammer at 7 days of curing age 70 68 66 64 62 60 58 0% ESP 5% ESP 10% ESP 15% ESP Concrete Mix for 28 Days Curing Age
·Analysis of the chloride diffusion coefficients by different test methods in concrete mixtures containing metakaolin and high slag blast furnace cement November 2019 Matria Rio de Janeiro 24 4
·The source of cement had little effect on the shrinkage The 90 day drying shrinkage for all three control mixtures A P B P and C P fell within a range from 460 to 505 microstrains The shrinkage curves show that for a given cement mixtures containing slag cement mixtures BFS and FB had less shrinkage than the control mixtures
·The heavy weight concrete mixture SS100 with highest value of μ as Table 5 was found to be the concrete mixture with best radiation shielding among other heavy weight concrete mixtures studied in the present work In order to select a suitably safe attenuation level for calculating the optimum thickness of each concrete mixture
·To study the healing capacity of asphalt mixtures containing iron slag specimens with various amounts of iron slag additive were prepared and tested using a semi circular bending test And they have developed a statistical methodology to model the healing capacity of asphalt concrete mixtures AC 16 from the characteristics of the metal
·contains silicon dioxide alumina and iron oxide As a properties of concrete mixtures incorporating CSA of high performance concrete containing nano silica and silica
·Mineral fillers used in asphalt concrete mixtures have significant impacts on their performance In this study bagasse ash a waste material of the sugar refining industry is utilized as a filler material in asphalt concrete for performance evaluation of asphalt concrete It is used in varying percentages with partial and full replacement of stone dust which is conventionally
