Comparative Evaluation of Dolerite and Syenite as Crushed Stone Aggregate

2013 ◽  
Vol 824 ◽  
pp. 73-78
Author(s):  
E.O. Eze ◽  
O.U. Orie
Keyword(s):  
Compressive Strength ◽  
Los Angeles ◽  
Specific Gravity ◽  
Moisture Absorption ◽  
Ultrasound Velocity ◽  
Sodium Sulphate ◽  
Point Load ◽  
Crushed Stone ◽  
Point Load Index ◽  
Los Angeles Abrasion

Dolerite and syenite were comparatively studied and evaluated for their potential as crushed stone for civil engineering construction. Properties of the rocks tested included specific gravity, moisture absorption, Schmidt hammer rebound, point-load strength, unconfined compressive strength, Los Angeles abrasion, aggregate crushing value, sodium sulphate soundness, and ultrasound velocity. The thermal heat capacity and coefficient of expansion of the stones were also determined. The rocks had high specific gravity of over 2.75, high compressive strength of 196-256 MPa, high point load index (Is50) of 17-23 MPa and low porosity of 0.27-0.29 % required of good aggregates. However, the rather high moisture absorption and high magnesium sulphate loss of the rocks exceeded the 3 and 18 % considered as the upper limits for good aggregates. This raised concern as to the durability of the rocks under aggressive environment. Also, the ferromagnesian minerals of the dolerite are prone to deteriorate badly under harsh environment. The typically elongate and angular aggregate shape of dolerite aggregate meant poor mix workability and more cement requirement for a given strength than the less angular syenite aggregate.

scholarly journals Construction material assessment from quarry sites at Chaktan-Ghasa-Kaligandaki River area, western Nepal

1970 ◽  
Vol 14 ◽  
pp. 77-82 ◽  
Author(s):  
Ujwal Raghubanshi ◽  
Naresh Kazi Tamrakar
Keyword(s):  
Los Angeles ◽  
Construction Material ◽  
Sodium Sulphate ◽  
Point Load ◽  
Appreciable Amount ◽  
Hydroelectric Power ◽  
Rock Types ◽  
Freeze And Thaw ◽  
Los Angeles Abrasion ◽  
Augen Gneiss

Construction material assessment is the crucial part of the hydroelectric power projects. The quality and quantity of the construction materialis the major concern when exploring construction material. Four quarry sites (Q1, Q2, Q3 and Q4) were identified and assessed for both quantityand quality. Distribution of rock quarry sites was taken for quantitative assessment of reserves. The rock samples were obtained from the sitesand were analysed for physical, mechanical and petrographic features. Rock types in quarry sites were schistose marble (in Q1), augen gneiss(in Q2), and banded gneisses (in Q3 and Q4). The analytical results showed that water absorption values were < 1% in all the samples, but wasthe highest in Q2 (0.92%). Contrarily, Q2 possessed the least specific gravity among the samples. Sodium sulphate soundness values rangedfrom 0.21 to 0.77, which was the highest in Q2. Samples Q1, Q3 and Q4 yielded Los Angeles Abrasion value below 45%, whereas Q2 gave57.5%. Similarly, Q2 also yielded the least value (1.82 MPa) of point-load strength index tested along the foliation. Augen gneiss (Q2) showedthe low abrasion resistance and soundness to freeze and thaw because of weak bonding between platy and other constituents of the rock , whereasschistose marble and banded gneisses yielded better resistance to abrasion and freeze and thaw, and possessed better strength perhaps due towell bonding among the mineralogical constituents due to the presence of appreciable amount of carbonate minerals.DOI: http://dx.doi.org/10.3126/bdg.v14i0.5442Bulletin of the Department of Geology Vol.14 2011, pp.77-82 

Investigation of Point Load Index Using Novel Discrete Based Model

2016 ◽  
Vol 846 ◽  
pp. 348-353
Author(s):  
Somayeh Behraftar ◽  
Joshua Heslin ◽  
S. Galindo Torres ◽  
Alexander Scheuermann
Keyword(s):  
Compressive Strength ◽  
Material Properties ◽  
Mechanical Model ◽  
Rock Type ◽  
Correlation Factor ◽  
Point Load ◽  
Load Test ◽  
Point Load Index ◽  
Bonded Particles ◽  
The One

In this study, a micro-mechanical model is developed to study the correlation of the point load index in rocks with uniaxial compressive strength (UCS) tests. The model is represented by an array of bonded particles simulated by a novel discrete based model, which was introduced by the authors previously. The point load test (PLT) is performed in the field on rock samples to classify and estimate the UCS of a rock type via the index-to-strength correlation factor k. Numerical analyses, such as the one presented in this work, will serve to close the knowledge gap concerning the correlation between k, UCS and other material properties of rocks.

scholarly journals The effect of coarse aggregate hardness on the fracture toughness and compressive strength of concrete

2019 ◽  
Vol 258 ◽  
pp. 04011
Author(s):  
Atur P. N. Siregar ◽  
Emma L. Pasaribu ◽  
I Wayan Suarnita
Keyword(s):  
Fracture Toughness ◽  
Compressive Strength ◽  
Los Angeles ◽  
Coarse Aggregate ◽  
Concrete Aggregate ◽  
Beam Size ◽  
Intensity Factors ◽  
Coarse Aggregates ◽  
Los Angeles Abrasion ◽  
Compressive Strength Of Concrete

Coarse aggregate is the dominant constituent in concrete. Aggregate hardness is a variable needed to investigate in determining its effect on the critical stress intensity factors (KIC), dissipated fracture energy (Gf) and compressive strength (fc’) of the concrete. The hardness of coarse aggregate based on Los Angeles abrasion values of 16.7%., 22.6%, and 23.1% was used incorporated with Portland Composite Cement (PCC), and superplasticizer to create specimens. Cubes of 150x150x150 mm were employed to determine the fc’, and four beam sizes: 50x100x350 mm, 50x150x500 mm, 50x300x950 mm and 50x450x1250 mm were engaged to determine KIC and Gf. The fc’ and Gf of specimens manufactured by three different hardness of coarse aggregates were 45, 43, 40 MPa and 89.4, 54.0, 56.3 N/m respectively. KIC of specimens was 138.9, 119.4 and 114.1 MPa.mm1/2 for beam size of 50x100x350 mm; 148.2, 115.8 and 108.8 MPa.mm1/2 for beam size of 50x150x500 mm; 230.9, 183.1 and 157.9 MPa.mm1/2 for beam size of 50x300x950 mm; and 293.2, 248.1 and 244.3 MPa.mm1/2 for beam size of 50x450x1250 mm. Experimental results showed that decreasing hardness of coarse aggregate was found to have significant effect on the fracture toughness rather than on the compressive strength of concrete.

scholarly journals Penggunaan Limbah Nikel Sebagai Material Subtitusi Agregat Kasar Pada Beton K.250

2021 ◽  
Vol 2 (1) ◽  
pp. 29-36
Author(s):  
Muhammad Muhsar ◽  
Abdul Kadir ◽  
Sulaiman Sulaiman
Keyword(s):  
Compressive Strength ◽  
Los Angeles ◽  
Specific Gravity ◽  
Moisture Content ◽  
Concrete Compressive Strength ◽  
Normal Concrete ◽  
Test Standards ◽  
Volume Weight ◽  
Concrete Mixtures ◽  
Compressive Strength Of Concrete

The purpose of this study was to Analyze the characteristics of theaggregates used in concrete mixtures and analyze how muchincrease in compressive strength of concrete with a variation ofnickel slag substitution 0%, 5%, 15%, 25% compared with normalconcrete. The characteristics of the material examined are watercontent, sludge content, specific gravity and absorption, volumeweight, abrasion with los angeles machines, and filter analysis.While the large increase in compressive strength of concrete can betested at the age of 7 days, 14 days, 28 days and 35 days. From the results of the analysis of the characteristics of nickel slagwaste in concrete mixes meet the test standards in concretemixtures, with a moisture content of 0.86%, sludge content of 0.44%,specific gravity of 2.94 gr / cm3, volume weight of 1.76 gr / cm3,abrasion 36.07%. And a large increase in compressive strength ofconcrete with a variation of nickel slag substitution of 0%, 5%, 15%,25% compared to normal concrete is increasing. The highestpercentage increase in concrete compressive strength is found inconcrete compressive strength between a variation of 15% with avariation of 25% at 14 days concrete age, with a percentage increasein value of 13.13%.

scholarly journals ANALISIS PENGARUH TINGKAT PELAPUKAN TERHADAP KEKUATAN BATUAN (STUDI KASUS PADA BATULEMPUNG DARI FORMASI WARUKIN)

2021 ◽  
Vol 5 (3) ◽  
pp. 89
Author(s):  
Dini Ayu Hanifah ◽  
Eko Santoso ◽  
Kartini Kartini
Keyword(s):  
Compressive Strength ◽  
Uniaxial Compressive Strength ◽  
Point Load ◽  
Schmidt Hammer ◽  
Point Load Index

Penentuan tingkat pelapukan yang dilakukan pada penelitian ini menggunakan metode yang lebih sederhana dan sering digunakan serta dengan biaya yang terjangkau yaitu dengan pengamatan lapangan secara visual deskriptif dan pengujian di laboratorium berdasarkan uji UCS (Uniaxial Compressive Strength), Schmidt Hammer, dan PLI (Point Load Index). Metodologi yang dilakukan dan digunakan pada penelitian ini meliputi, data tingkat pelapukan berdasarkan pengamatan secara deskripsi visual yang mengacu pada penelitian terdahulu, data uji sifat fisik batulempung, dimensi batulempung, nilai rebound dari alat schmidt hammer, dan nilai kuat tekan batulempung menggunakan alat UCS (uniaxial compressive strength) dari 10 sampel batulempung, serta nilai PLI. Berdasarkan pengamatan lapangan secara visual deskriptif adapun tingkat pelapukan batulempung dalam penelitian ini termasuk ke dalam tingkat pelapukan III (lapuk sedang), IV (lapuk kuat), dan V (lapuk sempurna) yang mewakili 10 sampel ( mengacu pada penelitian Sadisun dkk, 1998 ). Sedangkan berdasarkan nilai UCS yang didapatkan dari nilai kuat tekan tertinggi sampai terendah dari 10 sampel yaitu sebesar 3,39 MPa masuk ke dalam tingkat pelapukan III (lapuk sedang), 1,98 MPa masuk ke dalam tingkat pelapukan IV (lapuk kuat), serta 0,63 MPa masuk ke dalam tingkat pelapukan V (lapuk sempurna). Berdasarkan hasil dari nilai rebound yang didukung dengan penelitian menurut ahli Hencer dan Martin (1982), tingkat pelapukan batulempung dalam penelitian ini masuk ke dalam highly weathered (lapuk kuat) dengan nilai rebound rata-rata sebesar N<25. Dan berdasarkan dari nilai PLI tingkat pelapukan pada penelitian ini masuk ke dalam tingkat pelapukan III dan IV. Kata-kata kunci: tingkat pelapukan, uniaxial compressive strength, schmidt hammer, point load index

scholarly journals Korelasi Point Load Index dan Uniaxial Compressive Strength pada Satuan Batupasir dan Batulempung Formasi Latih untuk Penentuan Koefisien Kekuatan Batuan di Pit X Tambang Batubara PT Berau Coal, Kalimantan Timur

2021 ◽  
Vol 9 (1) ◽  
pp. 9-16
Author(s):  
Yan Adriansyah ◽  
Guruh Krisnantara ◽  
Kurniawan Setiadi
Keyword(s):  
Compressive Strength ◽  
Uniaxial Compressive Strength ◽  
Mining Industry ◽  
Point Load ◽  
Engineering Properties ◽  
Test Results ◽  
Rock Engineering ◽  
Point Load Index ◽  
Rock Samples ◽  
Laboratory Test Results

Physical and mechanical properties of rock for engineering purposes are indispensable for any civil/construction, mining and other engineering requirment. The results of the uniaxial compressive strength (UCS) test are very much needed in various geotechnical analyzes or engineering, in particular in the mining industry in relation to the calculation of the pit slope design and other mining infrastructure. Rock samples used in this study were obtained from the results of geotechnical drilling (full core drilling). The rock engineering properties test to obtain UCS and PLI values was carried out in the laboratory. Testing the rock hardness index using the point load index (PLI) can be done more quickly, cheaply, practically and can use rock samples with a variety of sample shapes.         The focus and object of the research are mudstone and sandstone units as part of the Lati Formation. These two types of layers are the most dominant rock types as a constituent of the pit slopes in the research area. To ensure that the correlation results are in accordance with the rules of scientific research, the distribution of UCS and PLI data from laboratory test results is verified using a statistical approach / testing. Correlation and analysis between the two rock engineering properties test results are very useful for geotechnical analysis data input. The coefficient or constant values obtained can be used to determine the rock strength values used in various geotechnical analyzes so that the analysis can be carried out more efficiently, effectively and quickly and can support geotechnical engineering work.

Sign in / Sign up

Export Citation Format

Share Document