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·Z Jiang Q Ren J Wu C Zhang A Zhong Study on properties of machine made sand and relevant issues of applications in concrete New Build Mater 37 11 1 4 2010 Google Scholar J Han X Xiao The current situation and development trend of aggregates in China China Concrete 9 36 42 2013
powder into machine made sand concrete to improve the overall performance of concrete The machine made sand contains stone powder with a particle size of less than mm which is one of the significant differences between machine made sand and natural sand[4] Stone powder is a by product of machine made sand If it is not used it will cause
·requirements of relevant Indian Standards and requirements of IS 456 Type and grade of cements used since last audit shall be reported Mineral Admixtures —Mineral Admixtures shall Conform to IS 456 Types of mineral admixtures used shall be reported since last audit Aggregates — Aggregates used for concrete shall be in accordance
·The results indicate that the proportion of machine made sand is 40% in C30 concrete which makes the concrete show the best performance and the maximum compressive strength In C50 concrete as the proportion of machine made sand increases the initial dispersion of concrete gradually decreases the loss of dispersion increases and the
·A campaign to investigate the flexural performance of steel fiber reinforced composite recycled aggregate concrete SFR CRAC beams matched with 500 MPa longitudinal rebars indicated that the assumption of plane cross section held true approximately and formulas are suggested for predicting the cracking moment crack width and flexural stiffness at normal
The preparation method of machine made sand makes its particle shape rough and sharp large porosity large specific surface area and high content of stone powder resulting in a big difference between machine made sand concrete and natural river sand concrete and the changes of its performance indicators will also affect
·The maximum paste volume was set as 10% of the total concrete volume and 135 kg/m 3 for concrete made with Portland cement of specific gravity of 315 kg/m 3 The composition of powder was determined by replacing cement with SCMs according to the procedure in Fig Water content was kept at 17 20% of total concrete volume depending
·draft fiaalized by the Cement and Concrete Sectional Committee had been approved by the Civil Division Council As a standard fine auregate used for assessing the quality of cement standard sand plays a very important role in the cement industry The importance of a standard sand in industrial economy is
·The mechanical and working properties of the machine made sand concrete reach the optimum condition when the mineral admixture is 20% the sand rate is 46% the stone powder content is 10% and the
Materials and Construction and Dam Concrete present not only general provisions for verification of specified performance requirements but also standard methods as simplified methods to achieve the performance requirements under certain conditions JSCE
·According to the authors best information the majority of research focuses on other waste materials such as recycling industrial waste glass silica fume marble and waste foundry sand etc However some researchers suggest dune sand as an alternative material for concrete production but knowledge is still scarce Therefore a comprehensive review is
·The current specifications for RAC in structural engineering primarily focus on the application of RAC prepared with RCA with limited attention given to the use of recycled fine aggregate [9] The utilization of recycled fine aggregate is restricted due to its lower quality compared to river sand resulting in decreased workability and mechanical properties of concrete
·Concrete has advantages such as a wide range of raw material sources excellent mechanical properties good durability low cost and ease of construction [1] It is widely used in various fields including construction transportation marine engineering and hydraulic engineering [1] [2] [3] Currently architectural structures are evolving towards taller larger
·According to the relevant research on the requirement of the abrasion resistance of concrete pavement the corresponding abrasion amount should be less than kg/m 2 Sun 2010 The abrasion of different dosages of CS concrete in this study met the requirement Influence of stone powder content in machine made sand on mortar concrete J
·The mix design of concrete is conventionally performed in the laboratory However the limitations of time cost of materials single objective optimization and the limited number of trial specimens make it cumbersome The present study aims to overcome these limitations by adopting predictive machine learning ML model and multi objective
·Although the machine made sand was widely used for concrete in recent years in China it was short of studies on the relations among the basic mechanical properties of fly ash concrete with
·Hydraulic cement concrete is a cement and water paste in which aggregate particles are embedded Aggregate is granular material such as sand gravel crushed stone blast furnace slag and lightweight aggregates that usually occupies approxi mately 60 to 75% of the volume of concrete Aggregate properties significantly affect the workability of
·The Indian Standard IS code for Fineness Modulus of Sand IS Code outlines requirements for grading physical properties and other related specifications Fineness Modulus of Sand IS Code is important in concrete mix design gradation analysis filter media selection and asphalt mix design It has certain challenges due to variability in
·The chloride ion permeability coefficient of machine made sand concrete at 28d are less than 182×10 14m2/s showing that the C40 machine made sand concrete has good resistance to chloride ion
·They found that using the same amount of cement water and sand but with different types of sand namely natural medium sand natural fine sand and artificial sand mainly composed of stone chips the compressive strengths of the three mortar mixtures at 28 days were kg/cm2 kg/cm2 and kg/cm2 respectively
·Concrete sand is a little stone called aggregate sand composed of gneiss granite rock or specific type of sand firstly screened and wash Fig 5 1 or crushed stone in little pieces up to a size of 5 mm in Requirements of as well as water and cement most probably an Aggregate proportions shrinkage pump ability
· 《》 ： C40 。
·The mechanical and working properties of the machine made sand concrete reach the optimum condition when the mineral admixture is 20% the sand rate is 46% the stone powder content is 10% and the water cement ratio is They are designed to meet specific performance requirements [7 8] On the other hand
·Type I ordinary Portland cement was used with a specific surface area of 362 m 2 /kg the properties and oxide compositions of cement were shown in Table 1 Table AMF and MS were made from limestone The XRD pattern of AMF was shown in Fig 1 and the specific surface area was 353 m 2 /kg MS had a fineness modulus of and its physical
