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A Study on Strength Characteristics of Concrete by Replacing Coarse Aggregate by Demolished Column Waste Dr Ramakrishna Hegde 1 Prof Shrinath Rao K 2 Shashank H 3 Shivaraja Hanumantha Madar 4 Askarali Hajaresab Jakathi 5 Pujari Varunkumar Vijaykumar 6 1 Professor Head of Department Department of Civil Engineering Srinivas University College of Engineering Technology Mukka
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Cement treated bases are soils gravels or manufactured aggregates mixed with certain quantities of cement and water in order to improve the characteristics of a base or sub base layer Due to the exploitation of natural aggregates it is a matter of importance to avoid shortage of natural resources which is why the use of recycled aggregates is a practical solution In this paper we studied
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Characteristics Also called building sand or bricklaying sand this aggregate is very fine and looks like it s come straight from the beach Close up the grains are also round and smooth this makes it ideal for plastering and rendering though it is most commonly used in brickwork What is it used for Bricklaying and block work Pointing
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Main characteristics of CDW aggregate determined in addition to the main properties of concrete which was made using this aggregate were measured The results showed that the CDW could be transformed into recycled concrete aggregate leading to reduction in the concrete compressive strength ranged from 37% to 62% depending on the type of the CDW
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This knowledge spillover imitation dilemma will lead to an emergence of two groups of firms The first group includes firms who are pushed into R D investment to recognize and use external knowledge leading to new knowledge combinations Antonelli and Colombelli 2024 and reducing the likelihood of imitation
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Reliable indicators of recycled aggregate quality include aggregate density water absorption and the amount of attached mortar which can be estimated through various methods chemically through thermal shock etc
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Recycled concrete aggregates contain not only the original aggregates but also hydrated cement paste This paste reduces the specific gravity and increases the porosity compared to similar virgin aggregates Higher porosity of RCA leads to a higher absorption Mix Design
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The objective of this study was to investigate the influence of aggregate characteristics and gradation on the skid resistance of various asphalt mixtures Asphalt mixture slabs with different combinations of aggregate sources and gradations were fabricated in the laboratory These slabs were polished with a wheel polishing device developed by
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the natural fine aggregate at levels of 50% and 100% For that tests were carried out to characterize the aggregates in addition to the evaluation of the axial compressive strength of the specimens The results showed that the mixtures containing 50% of recycled aggregate give the material a compressive strength
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Jul 10 2022Author s Ermao Zhang [1] Xirui Wang [2] Wensheng Wang corresponding author [3] Haoyun Wang [3] 1 Introduction The continuous progress of economic society is promoting rapid urbanization and industrialization and meanwhile the generation of construction and demolition C D waste clay brick masonry concrete etc is being accelerated by the construction of new and old urban
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There are however aggregate characteristics other than strength such as the size shape surface texture grading particle size distribution and mineralogy which are known to affect concrete strength in varying degrees Basic Functions of Aggregate Cheap fillers Hard material Provide volume stability Reduce volume changes
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A minimum of 2 5 years of heavy equipment or industry sales experience crusher and screening aggregate equipment preferred Marketing and promotional experience in a manufacturing/dealer sales
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The packing characteristics of aggregates are very important for aggregate blend design which is closely related to the performance of mixtures In this study an indoor packing experiment was designed to investigate the behaviors of single size particle packing and two size particle packing The effects of particle composition particle size and size ratio particle morphology on packing
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Nov 16 2022Construction and demolition waste characteristics vary based upon nature of waste strength attributes of original elements age of the destroyed structure etc Recycling of aggregate material from construction and demolition trash may aid to alleviate the gap between production and consumption for aggregates safeguard limited quantities
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In order to study the effect of Ca and sulfur contents on the characteristics of inclusions industrial experiments using 95CrMo steel were conducted SEM EDS detections and stereological analysis were used to probe the characteristics of inclusions including their compositions morphologies size number density and distribution The results indicate that there were mainly three types of
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Nov 14 2022In this research the consequence of using rubber tire aggregates RTA on the durability and mechanical characteristics of polypropylene fibers PF reinforced concrete is evaluated Fifteen concrete mixtures were produced and tested in the laboratory RTA was utilized instead of fine natural aggregates FNA to the concrete at concentrations of 0% 5% 10% 15% and 20% by a volumetric
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Results showed that the recycled aggregate contents and composition and the cement content exhibited significant influence on the mechanical characteristics of cement stabilized cold recycling mixtures An increase in either recycled aggregate content or reclaimed cement stabilized base course resulted in an increase in the water content
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Mostly made with recycled materials crushed concrete aggregates are usually taken from demolished construction sites and projects It s used for backfills and as a granular sub base for areas that are deeper than 150mm So if this fits your project needs it s the right material for you
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This dis having various levels of recycled aggregate as replacement of crepancy effect between the compressive strength at 7 and 28 natural coarse aggregate 25% 50% 75% and 100% were days can be attributed to the different contributions of measured at ages of 7 and 28 days and the results are provided recycled aggregate in the compressive strength
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Here s a quick overview of the workflow Choosing default appearance for each layer on the Customize Your Map map Creating new thematic maps by duplicating the original one and removing excess data Making specific appearance settings for every thematic map in the Editor Adding maps to the Map Portal
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By comparing the phase changes between the LSS and LSS based geopolymer and analyzing the iron behavior we have deduced that the hydration process characteristics could be described as below The Ca O bond and Fe O bond were broken in the glass network phase under the action of OH to form Ca OH 2 and Fe OH 2 respectively because the bond energy between the network modifier and
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An evaluation of the recycled aggregate characteristics Apr 20 2024 The presence of adhering old mortar results in the water absorption crushing index and Los Angeles wear coefficient of RA were higher than original aggregate resulting in the performance of recycled aggregate concrete RAC is weaker than natural aggregate concrete NAC
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Recycled aggregates are just as durable and effective as freshly quarried materials Recycled aggregates make effective bases fillers and drainage Good sourcing and processing by professionals ensures quality is maintained Versatile Recycled aggregates are used frequently across many industries and for many varying projects
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This experimental study was focused on the application of a surface modified hemp hurds aggregate into composites using an alternative binder of MgO cement This paper presents the results of the comparative study of the parameters chemical and physico chemical modification and hardening time affecting the physical density thermal conductivity coefficient and water absorption behavior
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Concrete is an important construction material Its characteristics depend on the environmental conditions construction methods and mix factors Working with concrete is particularly tricky in a hot climate This study predicts the properties of concrete in hot conditions using the case study of Rawalpindi Pakistan In this research variable casting temperatures design factors and curing
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PhD cohort 4 In 2024 the Transition to Zero Pollution initiative formed a fourth cohort of 11 students from across College carrying out research related to TZP As with our other cohorts the students are all aligned with the NERC funded Science and Solutions for a Changing Planet DTP run by the Grantham Institute Find out more about the
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The results show that treatment with H 2 SO 4 and heating and scrubbing yield aggregate with reduced water absorption and other desired properties of natural aggregate The concrete made out of these treated aggregates are able to achieve strength and performance characteristics on par with natural aggregate concrete
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The fine aggregate however generally contains a considerable amount of old cement paste and mortar This tends to increase the drying shrinkage and creep properties of the new concrete as well as leading to problems with unworkable mix and strength
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Mechanical properties such as compressive strength split tensile strength and modulus of rupture are also reported The bond stress and slip at failure are determined by experimentation and a comparison is made The recycled aggregate concrete performed better than the natural aggregate concrete in terms of normalised bond stress
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The physical characteristics of treated and untreated CRCA were evaluated The impact of treated and untreated CRCA on the rutting resistance of asphalt mixtures was determined The obtained results indicated that the use of a combination technique of different treatment methods is a highly successful method for improving various physical properties
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