Top Equipments




Popular searches

Adhesion between Asphalt and Recycled Concrete Aggregate ,

To study and evaluate the adhesion between recycled concrete aggregate and asphalt, the contact angles CAs between droplet water and ethanol and recycled concrete aggregate RCA , natural aggregates, and solid bitumen matrix asphalt, SBS modified asphalt were tested via the sessile drop method with an optical microscope The surface free energy was then ,...

Know More

Recycled Aggregates

Recycled Aggregate Characteristics The crushing characteristics of hardened concrete are similar to those of natural rock and are not significantly affected by the grade or quality of the original concrete Recycled concrete aggregates produced from all but the poorest quality original concrete can be expected to pass the same tests required ....

Know More

The Effect of Fine and Coarse Recycled Aggregates on Fresh ,

Today, the use of recycled aggregates as a substitute for a part of the natural aggregates in concrete production is increasing This approach is essential because the resources for natural aggregates are decreasing in the world In the present study, the effects of recycled concrete aggregates as a partial replacement for fine by 50 and coarse aggregates by 100 ,...

Know More

Effects of Aggregate Size, Shape, and Surface Texture on ,

He also pointed out that coarse aggregate bitu-minous concrete, where little or no gradation control of the aggregate was attempted, has performed well for 20 years Griffith and Kallas 11 , from a study of crushed and uncrushed coarse and fine ag-gregates, found that the relative proportions of coarse and fine aggregate for maximum...

Know More

What are the Properties of Aggregates for Concrete ,

Jun 09, 2021 0183 32 In concrete, fine aggregates and coarse aggregates make up about 75 of the total concrete materials It is, therefore, significantly important to acquire the right type and quality of aggregates at the site The aggregates from the main matrix of the concrete/mortar The aggregate particles are glued together by the cement water paste There,...

Know More

Experimental Study on Mechanical Performance of Recycled ,

Keywords recycled aggregate, concrete strength, discarded carbon fibers, concrete, based materials, concrete and cement Citation Zaid O, Zamir Hashmi SR, Aslam F and Alabduljabbar H 2021 Experimental Study on Mechanical Performance of Recycled Fine Aggregate Concrete Reinforced With Discarded Carbon Fibers Front...

Know More

Shear Strength of Reinforced Recycled Aggregate Concrete ,

Dec 18, 2020 0183 32 This paper is related to a laboratory program for the shear strength of reinforced concrete corbels RCC cast with or without recycled aggregate RA by investigating the main parameters affecting the corbels behavior including the replacement aggregate recycling ratio, fcu , and shear span to effective depth ratio a/d Eight specimens were cast and tested...

Know More

Using recycled brick masonry aggregate for partial ,

Nov 05, 2021 0183 32 To ensure the source of fine aggregate for the construction industry and save the environment, it is necessary to find alternative materials to replace the river sand for making concrete This study aimed to experimentally investigate the suitability of using fine aggregate recycled from brick debris for partial replacement of river sand...

Know More

Experimental Studies on Ceramic Tiles used for Concrete ,

Jul 30, 2018 0183 32 Seven different concrete mixes were cast to test these hardened properties a conventional reference concrete and six concrete mixes with replacement ratios of 20 , 50 and 100 of natural fine aggregates by either fine recycled brick aggregates or fine recycled sanitary ware aggregat...

Know More

Cohesion coefficient of structural concrete made with ,

Nov 18, 2020 0183 32 The cohesion coefficient of structural concrete made with recycled concrete coarse aggregate RCA was evaluated independently for the first time, through push-off tests having no clamping force across the shear plane, and compared with the cohesion coefficient of structural concrete made with natural coarse aggregate NCA...

Know More

Properties of Concrete Containing Recycled Fine Aggregate ,

In the first part, the properties of concrete containing 25, 50, 75 and 100 by wt replacement of natural fine aggregate NFA with RFA are considered In the second part, the effect of class F fly ash as partial replacement of cement on the properties of recycled concretes containing 25 and 50 RFA are evaluated...

Know More

Concrete Mix Design

Jun 08, 2015 0183 32 It is well accepted that higher the workability greater is the fine aggregate required to maintain cohesion in the mix The water content per cubic meter is recommended based on workability requirement given in terms of slump and VeBe time It recommends different water contents for crushed aggregates and for natural aggregat...

Know More

A Review of the Current Specifications and Practices of ,

Only 10-20 recycled fine aggregate is beneficial 7 The use of recycled fine aggregates has caused lower compressive strength in samples see Table 2 Recycled fine aggregate is prohibited from use in reinforced concrete because of its significant impact on drying shrinkage and creep 9 Water Demand...

Know More

PDF Concrete with fine recycled aggregates A review

For this reason, several authors have conducted studies analysing the effect of incorporating fine recycled aggregates FRA in concrete, obtaining satisfactory results both in ,...

Know More

Influence of recycled aggregates on properties of self ,

The main goal of this work is to study the influence of recycled aggregates on self-consolidating concrete Concretes were mixed with 50 of the coarse aggregate replaced by recycled aggregates Patagonia gravel and with 20 of the fine aggregate natural sand replaced by crushed concrete powders...

Know More

IS 383 1970 Specification for Coarse and Fine ,

211 JVuttrral Sand - Fine aggregate resulting from the natural disinteg- ration of rock and which has been deposited by streams or glacial agenci 212 Crushed Stone Sand - Fine aggregate produced by crushing hard stone 213 Crushed Grace1 Sand - line aggregate produced by crushing natural gravel...

Know More

Shear Strength Characteristics of Recycled Concrete ,

Recycled concrete aggregate RCA is a promising substitute for natural aggregates and the reuse of this material can benefit construction projects both economically and environmentally RCA has received great attention in recent years in the form of aggregate as well as a geotechnical material of sand size Next to RCA, another recycled material, which reduces ,...

Know More

Aggregates for Concrete

Recycled concrete, or crushed waste concrete, is a feasible source of aggregates and an economic reality, especially where good aggregates are scarce Conven-tional stone crushing equipment can be used, and new equipment has been developed to reduce noise and dust Aggregates must conform to certain standards for...

Know More

Evaluation on the Surface Modification of Recycled Fine ,

Feb 21, 2018 0183 32 Recycled aggregates RAs production techniques are essential for the material circulation society because RAs from demolished concrete waste can sustainably be reused as a concrete material However, RAs can bring about several performance decreases when they are used for recycled aggregate concrete RAC because of the low qualities ie, high water ,...

Know More

Cohesion coefficient of structural concrete made with ,

The cohesion coefficient of structural concrete made with recycled concrete coarse aggregate RCA was evaluated independently for the first time, through push ,...

Know More

A Critical Review on the Influence of Fine Recycled ,

The aim of this critical review is to show the applicability of recycled fine aggregates RFA in concrete regarding technical performance, environmental impact, energy consumption and cost It is not possible to judge the performance of concrete by considering one dimension Thus, this study focussed on the fresh and hardened eg, mechanical and durability properties and ,...

Know More

Microstructural characterization of concrete prepared with ,

This work studies the use of fine recycled aggregate to replace fine natural aggregate in the production of concrete and reports the resulting microstructur The used raw materials were natural aggregate, recycled aggregate obtained from ,...

Know More

PDF Recycled Glass Concrete Coarse and Fine Aggregates ,

Grading curves of glass coarse aggregates The density of the coarse aggregate was 2650 Kg/ m3 and of the fine aggregate was 1680 Kg/ m3, whereas the colored glass had a density of 1650 Kg/ m3 Three batches were designed whereby the first batch, labeled R, consists of a regular mix The second batch labeled C13, consists of 13 of coarse ....

Know More

HOW AGGREGATE PROPERTIES AFFECTS CONCRETE ,

Feb 15, 2019 0183 32 Soundness of aggregate -for concrete liable to be exposed the action of frost, coarse and fine aggregates should pass a sodium or magnesium sulphate accelerated soundness test Grading of aggregates Grading of aggregates is an important aspect as they can influence the various properties of concrete such as cohesion, water demand, workability ....

Know More

PDF Recycled Glass Concrete Coarse and Fine Aggregates

Recycled waste glasses were used as coarse and fine aggregates replacement in concrete Coarse aggregates were replaced with Green Bottles coarse aggregates at ,...

Know More

Technical Advisory T 504037 Use of Recycled Concrete ,

Ahmad, SH, Properties of Concrete Made with North Carolina Recycled Coarse and Fine Aggregate, Center for Transportation Engineering Studies, North Carolina State University, Raleigh, NC, 1996 AASHTO Subcommittee on Materials, Fine Aggregate for Portland Cement Concrete, AASHTO M 6, American Association of State Highway and Transportation ....

Know More

Cohesion coefficient of structural concrete made with ,

The recycled coarse aggregate and the recycled fine aggregate were produced mainly from various reinforced concrete members of a building structure as well as from 300 mm cubic concrete specimens...

Know More

Use of fine recycled concrete aggregates in concrete A ,

Jun 01, 2021 0183 32 The recycled concrete fines may contain calcium hydroxide When the recycled concrete fines are in contact with water, the alkali content of the water may increase because of the solubility of calcium hydroxide and that newly formed by the hydration of unhydrated cement if any in the recycled concrete fin 445...

Know More

Recycled Concrete Aggregate

1921 Recycled concrete aggregate RCA Coarse RCA complies to the requirements of maximum 5 masonry content, 5 fine materials, 05 lightweight material, 5 asphalt, 1 foreign material and 1 acid soluble sulfate, and is suitable for use in concrete as per BS 8500-2 2006 In designated concrete RC20/25 to RC40/50, RCA can automatically ....

Know More

Standard Specification for Concrete Aggregates1

TABLE 1 Limits for Deleterious Substances in Fine Aggregate for Concrete Item Mass Percent of Total Sample, max Clay lumps and friable particles 30 Material finer than 75- 181 m No 200 sieve Concrete subject to abrasion 30A All other concrete 50A Coal and lignite...

Know More