scholarly journals Petrography of fine aggregates from Kaligandaki River, western Nepal: implication for assessment of deleterious constituents

1970 ◽  
Vol 14 ◽  
pp. 29-34
Author(s):  
Naresh Kazi Tamrakar
Keyword(s):  
Size Fraction ◽  
Lower Amount ◽  
Fine Aggregate ◽  
Concrete Aggregates ◽  
Rock Fragments ◽  
Fine Aggregates ◽  
Quartz Grains ◽  
River Banks

Seven fine aggregate samples from test pits driven at the river banks of the Kaligandaki River and banks of the contributingstreams around Kokethanti-Chhyo Bagar area were petrographically analysed as these will be used for concrete aggregates. Theaggregates had median grains size of 0.45-1.00 mm and were well graded. They were dominantly composed of carbonate rockfragments and the total QFL modes being Q14.81–28.87F0.63–4.58L66.55–84.15. All the samples were classified as medium-grainedcalc-lithic sands. Quartz grains were dominantly megaquartz. Some chert grains and few quartz grains occurring in siliceouslimestones were of microquartz.Considering deletereous constituents, the sample T1 had chert fragments. The sample T2 had high amount of micas suggestingits low workability. Silt/clay-grade size fraction was the deletereous material to all the samples and this fraction should be removedduring processing. The samples T2, T6 and T7 showed greater preferability among the samples as these had lower amount ofunsound rock fragments such as carbonaceous schists/phyllite, and other deletereous materials.DOI: http://dx.doi.org/10.3126/bdg.v14i0.5436Bulletin of the Department of Geology Vol.14 2011, pp. 29-34  

scholarly journals Evaluation of fine aggregates from the Budhi Gandaki-Narayani River, central Nepal for mortar and concrete

2019 ◽  
Vol 58 ◽  
pp. 69-81
Author(s):  
Ajay Babu Nayaju ◽  
Naresh Kazi Tamrakar
Keyword(s):  
Organic Matter ◽  
Construction Materials ◽  
Compositional Analysis ◽  
Dry Density ◽  
Fine Aggregate ◽  
Hydro Power ◽  
Fine Sediments ◽  
Rock Fragments ◽  
Fine Aggregates ◽  
Lesser Himalayas

Huge amounts of construction materials are required to fulfill construction works, which are being undertaken by local and Government levels. In this regard, searching for good quality construction materials is a tough job. The Budhi Gandaki-Narayani River is rich in carrying natural fine aggregates from the Higher and the Lesser Himalayas, which are extensively exposed along its bank. Currently ongoing and future hydro power projects, will require a tremendous amount of fine aggregates. In light of this, the present study was made to evaluate fine aggregates of the Budhi Gandaki-Narayani River. The gradation curves of fine aggregates from this river varied from well graded to uniform graded. Compositional analysis shows that quartz is dominant over other minerals. Rock fragments are composed of gneiss, schist, quartzite, metasandstone, phyllite, shale, granite, etc. Deleterious materials excluding organic matter range from 0.3 % to 1.5 % and organic matter present in range from 0.57 % to 1.11 %. The trend of presence of inorganic deleterious material and organic matter is increasing towards southern segments of the river, but they remain below 2%. Mean roundness of particles ranges from 1.88 to 2.54. Bulk dry density of fine aggregate is below 2 gm/cm³. Similarly, the specific gravity ranges between 1.49 and 1.79. Fineness modulus ranges between 1.36 and 3.50 showing that, coarse, medium, fine and very fine sediments are distributed along the stretch of river. Water absorption value of fine aggregate ranges from 0.48 % to 2.87 %. When using fine aggregates from southern segments of the Budhi Gandaki-Narayani River, reduction of mica and beneficiation process will enhance and provide better result for smooth plastering, rendering and screeding.

scholarly journals Geotechnical properties of construction aggregates from the Trishuli Ganga River, Galchi area, Central Nepal

2013 ◽  
Vol 16 ◽  
pp. 43-52
Author(s):  
Shailendra Shrestha ◽  
Naresh Kazi Tamrakar
Keyword(s):  
Los Angeles ◽  
Ganga River ◽  
Huge Amount ◽  
Concrete Aggregates ◽  
Hydroelectric Project ◽  
Central Nepal ◽  
Fine Aggregates ◽  
Sand And Gravel ◽  
Quartz Grains ◽  
Potential Use

The Trisuli Ganga River is rich in sand and gravel which are widely exposed along its banks. In recent years, quarry sites have been established and the materials have been supplied to markets. Apart from it the Trishuli III hydroelectric project is going to be established and for which a huge amount of construction aggregates will be required. From the study of sand and gravel as construction aggregates, it is found that the major composition of the sediments are metamorphosed rocks of the Lesser Himalayan rocks like gneiss, schist, quartzite, metasandstone, slate, granite, phyllite, etc. The gradation of coase aggregates range from dense to gap graded categories. Sulphate soundness value (SSV) and Los Angeles value (LAV) are 1.33–2.28% and 29.9–36.4%, respectively. These ranges show ability of the aggregates to resist weathering and abrasion, and since these values lie within international specifications, the aggregates are suitable for various uses as; both asphaltic and concrete aggregates. Considering the fine aggregates, though they contain considerable amount of quartz grains, also contain exceeding amount of mica, and possesses poor workablity. Fineness modulus ranges between 6.07 and 7.63, and exhibit dominantly sand size. Reduction of mica and further analysis for alkali-silica reactivity will enhance for its potential use. DOI: http://dx.doi.org/10.3126/bdg.v16i0.8883   Bulletin of the Department of Geology Vol. 16, 2013, pp. 43-52

scholarly journals Slope Stability Analysis of Recycled Concrete Fine Aggregate Stabilized and Blended Soils

2020 ◽  
Vol 9 (5) ◽  
pp. 991-994
Keyword(s):  
Limit Equilibrium ◽  
Recycled Concrete ◽  
Engineering Properties ◽  
Cement Kiln ◽  
Concrete Aggregate ◽  
Fine Aggregate ◽  
Concrete Aggregates ◽  
Recycled Concrete Aggregates ◽  
Fine Aggregates ◽  
Kiln Dust

Recycled concrete aggregate (RCA) is one of the major material generated from municipal soild waste industry. In the current study, recycled concrete aggregates are collected from the demolished building. The index and engineering properties of crushed concrete and locally available soil are determined. The study aims at effective reuse of demolition concrete waste as backfill of earth retaining walls. RCA passing through 4.75mm is stabilized by using Cement kiln dust (CKD) and Fly Ash (FA) in various proportions. Red soil is partially replaced by 30%, 50%, and 70% with recycled concrete fine aggregates. A numerical model is developed using limit equilibrium software i.e GeoStudio Slope/w. It is found that 15% CKD and 15% FA is optimum to stabilize the material. In case of blended soils, 30% replacement with RC-FA is found to be optimum

scholarly journals PENGARUH PENGGUNAAN AIR KOLAM TERHADAP KUAT TEKAN BETON (Studi Kasus Kecamatan. Kateman, Keritang dan Tembilahan Kota)

2020 ◽  
Vol 6 (3) ◽  
pp. 153-162
Author(s):  
Muhammad Juldin ◽  
Akbar Alfa
Keyword(s):  
Compressive Strength ◽  
Concrete Specimen ◽  
Well Water ◽  
Fine Aggregate ◽  
Concrete Aggregates ◽  
Coarse Aggregates ◽  
Fine Aggregates ◽  
Pass Through ◽  
Average Compressive Strength

AbstractConcrete is a composite material (mixture) consisting of cement, coarse aggregates, fine aggregates and water. The concrete formation mixture is designed in such a way as to produce fresh concrete that is easy to work with and meets the plan's compressive strength after hardening.The cement used is PCC type cement, although the composition of cement in concrete is only about 10%, but the role of cement is very important in concrete. Aggregates are mineral granules originating from nature or artificial which have a function as a mixture of fillers in concrete. The aggregate of the concrete mixture filler is divided into fine aggregates used from Javanese Inhu and coarse aggregates from Tanjung Balai Karimun. The fine aggregate is usually in the form of sand that passes through a filter with a diameter of 4.75 mm or 5 mm, while coarse aggregates do not pass through the filter. The water used is well water from Kateman District, Keritang District and Tembilahan District, Indragiri Hilir Regency, Riau Province.The compressive strength of concrete is the amount of load per unit area which causes the concrete specimen to break and there is no more carrying capacity. The average compressive strength of 28 days of cube specimens with well water in Kateman District = 491 kg / cm2, Keritang District = 469 kg / cm2 and Tembilahan District City = 475 kg / cm2.   AbstrakBeton merupakan bahan komposit (campuran) yang terdiri dari semen, agregat kasar, agregat halus dan air. Campuran bahan-bahan pembentukan beton dirancang sedemikian rupa, sehingga menghasilkan beton segar  yang mudah  dikerjakan  dan  memenuhi  kekuatan  tekan  rencana  setelah mengeras.Semen yang digunakan adalah semen tipe PCC, walaupun komposisi semen dalam beton hanya sekitar 10%, namun peran semen sangat penting dalam beton. Agregat adalah butiran mineral yang berasal dari alam atau buatan yang memiliki fungsi sebagai bahan pengisi campuran pada beton. Agregat pengisi campuran beton terbagi atas agregat halus yang digunakan berasal dari Japura Inhu dan agregat kasar berasal dari Tanjung Balai Karimun. Agregat halus biasanya berupa pasir yang lolos saringan dengan diameter 4,75 mm atau 5 mm, sedangkan agregat kasar tidak lolos saringan tersebut. Air yang digunakan yakni air sumur berasal dari Kecamatan Kateman, Kecamatan Keritang dan Kecamatan Tembilahan Kota Kabupaten Indragiri Hilir Provinsi Riau.Kuat tekan beton adalah besarnya beban per satuan luas yang menyebabkan benda uji beton pecah dan tidak ada lagi daya dukungnya. Hasil kuat tekan rata-rata umur 28 hari benda uji kubus dengan air sumur Kecamatan Kateman = 491 kg/ cm2, Kecamatan Keritang = 469 kg/cm2dan Kecamatan Tembilahan Kota = 475 kg/cm2.

scholarly journals Settlement Analysis of Recycled Concrete Fine Aggregate Blended Soils using Geostudio

2019 ◽  
Vol 9 (2) ◽  
pp. 3007-3010
Keyword(s):  
Recycled Concrete ◽  
Engineering Properties ◽  
Real Field ◽  
Fine Aggregate ◽  
Virgin Soil ◽  
Concrete Aggregates ◽  
Finite Element Software ◽  
Crushed Concrete ◽  
Fine Aggregates ◽  
Settlement Analysis

Crushed concrete (CC) is one of the most abundant waste materials generated from construction industry. This material is widely recycled and used in various applications like pavement, concrete aggregates and backfilling. Crushed concrete is mixed with any of virgin soil to increase the engineering properties of soil. In the present study, a sample of crushed concrete is collected from demolished buildings at Secunderabad and the material is segregated according to gradation for the present study. The index properties of crushed concrete like pH, specific gravity, water absorption, particle size distribution are obtained. Locally available soil is partially replaced i.e., 30%, 50%, and 70% with crushed concrete fine aggregates and its compaction characteristics and shear strength parameters are determined. In the continuation of the study, a numerical model is developed using a finite element software i.e GeoStudio Sigma/w. Mesh and boundary extent convergence studies are done for the model. The top 1m virgin soil is replaced with the mixture of CC and soils. Settlements for various percentages of CC and for different width of footing are obtained for a uniform stress of 200kPa. The stress is applied in 5 stages in order to simulate real field conditions. It was observed that 30% replacement of CC have given the least settlement for all widths of footing considered in the study

Effect of Copper Slag as a Fine Aggregate on the Durability Characteristics of High-Performance Concrete (HPC) Containing Silica Fume

2020 ◽  
Vol 07 (02) ◽  
pp. 1-10
Author(s):  
Rizwan Ahmad Khan ◽  
Keyword(s):  
Silica Fume ◽  
High Performance ◽  
High Performance Concrete ◽  
Copper Slag ◽  
Chloride Penetration ◽  
Interfacial Transition Zone ◽  
Fine Aggregate ◽  
Fresh Properties ◽  
Fine Aggregates ◽  
Effect Of Copper

This paper investigates the fresh and durability properties of the high-performance concrete by replacing cement with 15% Silica fume and simultaneously replacing fine aggregates with 25%, 50%, 75% and 100% copper slag at w/b ratio of 0.23. Five mixes were analysed and compared with the standard concrete mix. Fresh properties show an increase in the slump with the increase in the quantity of copper slag to the mix. Sorptivity, chloride penetration, UPV and carbonation results were very encouraging at 50% copper slag replacement levels. Microstructure analysis of these mixes shows the emergence of C-S-H gel for nearly all mixes indicating densification of the interfacial transition zone of the concrete.

scholarly journals Engineering and Manufacturing Technology of Green Epoxy Resin Coatings Modified with Recycled Fine Aggregates

2021 ◽  
Author(s):  
Kamil Krzywiński ◽  
Łukasz Sadowski ◽  
Damian Stefaniuk ◽  
Aleksei Obrosov ◽  
Sabine Weiß
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Construction And Demolition Waste ◽  
Fine Aggregate ◽  
Micro Computed Tomography ◽  
Demolition Waste ◽  
Replacement Ratio ◽  
Recycled Fine Aggregate ◽  
Fine Aggregates ◽  
Computed Tomography Scanning

AbstractNowadays, the recycled fine aggregate sourced from construction and demolition waste is not frequently used in manufacturing of epoxy resin coatings. Therefore, the main novelty of the article is to prepare green epoxy resin coatings modified with recycled fine aggregate in a replacement ratio of natural fine aggregate ranged from 20 to 100%. The microstructural properties of the aggregates and epoxy resin were analyzed using micro-computed tomography, scanning electron microscopy and nanoindentation. The macroscopic mechanical properties were examined using pull-off strength tests. The highest improvement of the mechanical properties was observed for epoxy resin coatings modified with 20% of natural fine aggregate and 80% of recycled fine aggregate. It has been found that even 100% of natural fine aggregate can be successfully replaced using the recycled fine aggregate with consequent improvement of the pull-off strength of analyzed epoxy resin coatings. In order to confirm the assumptions resulting from the conducted research, an original analytical and numerical failure model proved the superior behavior of modified coating was developed.

Utilization of Cockle Shell (Anadara Granosa) as Partial Replacement of Fine Aggregates in Concrete

2021 ◽  
Vol 6 (2) ◽  
pp. 96-103
Author(s):  
Ranno Marlany Rachman ◽  
Try Sugiyarto Soeparyanto ◽  
Edward Ngii
Keyword(s):  
Compressive Strength ◽  
National Standard ◽  
Partial Replacement ◽  
Fine Aggregate ◽  
Concrete Compressive Strength ◽  
Concrete Technology ◽  
Normal Concrete ◽  
Fine Aggregates ◽  
Blood Clam ◽  
Anadara Granosa

This research aimed to utilize Anadara Granosa (Blood clam shell) clamshell waste as a new innovation in concrete technology and to investigate the effect of Anadara Granosa clamshell powder utilization as an aggregate substitution on the concrete compressive strength. The sample size was made of cylinders with a size of 10 cm x 20 cm with variations of clamshell powder 10%, 20% and 30% from the fine aggregate volume then soaked for 28 days as per the method of the Indonesian National Standard. The evaluation results exhibited that the slump value exceeded the slump value of normal concrete with a slump value of 0% = 160 mm, 10% = 165 mm, 20% = 180 mm and 30% = 180 mm. Additionally, it was found that the concrete compressive strength obtained post 28 days were 20.78 Mpa, 21.95 Mpa, 21.17 Mpa and 24.28 Mpa for normal concrete (0%), substitution concrete (10%), substitution concrete (20%) and substitution concrete (30%), respectively. Leading on from these results, it was concluded that the increment of Anadara Granosa clamshell powder substitution led to the increase of concrete compressive strength test.

La production de limon sur des terrasses de cryoplanation dans les monts Richardson, Canada

1999 ◽  
Vol 36 (10) ◽  
pp. 1645-1654 ◽  
Author(s):  
I Lamirande ◽  
B Lauriol ◽  
A E Lalonde ◽  
I D Clark
Keyword(s):  
Grain Size ◽  
Size Fraction ◽  
Runoff Water ◽  
Chemical Action ◽  
Intergranular Porosity ◽  
Potential Source ◽  
Petrographic Analyses ◽  
Glacial Time ◽  
Richardson Mountains ◽  
Quartz Grains

The production of silt on cryoplanation terraces in the Richardson Mountains was documented by a sedimentological study. Geochemical, grain-size, and petrographic analyses of the Jurassic Bug Creek sandstone were done. Results show that in the unaltered rock the detrital quartz grains are solidly held by a siliceous cement. In the altered and strongly altered sandstone, there is a marked increase in intergranular porosity and fracturing of the grains. The disaggregation and weathering of the sandstone releases mainly material in the silt-size fraction, with lesser amounts of sand and clay. This material covers the tread of the terraces and constitutes a potential source of loess in glacial time. Runoff water has a PCO2 value two orders of magnitude greater than the atmosphere yet is weakly mineralized, with only amorphous silica approaching saturation. However, the weathering of sandstones is probably accelerated by the chemical action of water which, by attacking the cement that forms the diagenetic overgrowth of the quartz grains, facilitates their release.

scholarly journals Analysis of Unconscious Properties and Strength Measurements for Concrete Containing Copper Slag-Review

2019 ◽  
pp. 421-426
Author(s):  
Velumani M ◽  
Sakthivel S ◽  
Yuvaraj K
Keyword(s):  
Free Water ◽  
Copper Slag ◽  
Fine Aggregate ◽  
Conventional Concrete ◽  
Coarse Aggregates ◽  
Free Water Content ◽  
Fine Aggregates ◽  
Water Absorption Test ◽  
The Government ◽  
By Products

The main aim of the environmental protection agencies and the government are to seek ways and means to minimize the problems of disposal and health hazards of by products. It is considered as a waste material which could have a promising future in construction industry as substitute of either cement or coarse aggregates or fine aggregates. Copper slag is one of the replacement mechanisms of material in concrete. Use of copper slag as a replacement for fine aggregate in concrete cubes various strength measurements was experimentally investigated in this study. Mainly contents of that M35 conventional concrete and copper slag as a replacement of fine aggregate  in 10%, 20%, 30%, 40%,50%, 60%, 80%, and 100% and also Portland Pozzolana Cement is noted. In this regard, laboratory study including water absorption test, bond strength, and percentage of voids, compressive strength & bulk density were conducted in ppc cement concrete which made by copper slag waste as a replacement of fine aggregate and PPC. A substitution up to 40-50% as a copper slag as a sand replacement yielded comparable strength to that of the conventional concrete. However, addition of more copper slag resulted in strength reduction due to the increase in the free water content in the mix, cured period in a curing tank for later resulting at 28 and 60 days.

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