This document discusses a study on the durability of Portland cement concrete in Nebraska with a focus on alkali-silica reaction (ASR). It describes the ASTM C1293 testing method used to evaluate ASR expansion over 14 weeks under high temperature and humidity. Test results are presented for various concrete mixes using different aggregates, cements, and mineral admixtures. The mixes generally showed very low or no expansion, indicating good resistance to ASR in Nebraska concretes.
Hydrogen Peroxide- Review of its Role as Part of a Mine Drainage Treatment St...Michael Hewitt, GISP
Jon Smoyer P.G., PA Department of Environmental Protection (DEP), “Hydrogen Peroxide- Review of its Role as Part of a Mine Drainage Treatment Strategy”
Hydrogen Peroxide has been used to oxidize and remove ferrous iron from mine drainage for decades. It is a relatively inexpensive and effective oxidant that can be used to achieve rapid ferrous iron oxidation in many active and semi-passive mine drainage treatment systems. This presentation outlines the physical properties, concentrations, and available delivery options for hydrogen peroxide.
Hydrogen Peroxide- Review of its Role as Part of a Mine Drainage Treatment St...Michael Hewitt, GISP
Jon Smoyer P.G., PA Department of Environmental Protection (DEP), “Hydrogen Peroxide- Review of its Role as Part of a Mine Drainage Treatment Strategy”
Hydrogen Peroxide has been used to oxidize and remove ferrous iron from mine drainage for decades. It is a relatively inexpensive and effective oxidant that can be used to achieve rapid ferrous iron oxidation in many active and semi-passive mine drainage treatment systems. This presentation outlines the physical properties, concentrations, and available delivery options for hydrogen peroxide.
Field Development Project : Gelama MerahHami Asma'i
A green field development project located in Sabah Basin comprises the whole upstream field development cycle from geology, reservoir studies to production facilities and economics. The objective is to come out with the best strategy to develop the field starting from our very own effort of reservoir characterization out of log and core data. Under supervision of lecturers, this project was completed as per scheduled.
Among new technical methodologies applied upon the completion this project:
1. Cubic Spline Interpolation Method in bulk volume calculation
2. Monte Carlo probabilistic method in reserve estimation
3. Reservoir Opportunity Index (ROI) method in well placement
Project was assessed by PETRONAS custodians.
The Effect of Dosage and Modulus of Activator on the Strength of Alkali Activ...ijtsrd
In this study, the effect of dosage and modulus of activator on the strength of alkali activated slag and fly ash based geopolymer mortar is studied. Fly ash from Tingyi is used. Blast furnace slag from No 1 Iron and Steel Industry, Pyin Oo Lwin is used. NaOH and Na2SiO3 are used as alkaline activator. Firstly, the physical properties of slag, fly ash and sand are tested. Alkali activated slag mortar is mixed with various proportion of activator. And the tests are made eight times with different activator dosage for slag mortar. Then the test is made once again without activator. Water slag cement ratio of 0.35 is used for this test. Fly ash based geopolymer mortar is mixed various proportion of activator. And the tests are made eight times with different activator dosage for fly ash based geopolymer mortar. Then the test is made once again without activator. Water fly ash ratio of 0.33 is used for this test. For both testing, samples are cured at 85°C for 24 hours and left at room temperature until the day of testing. The samples are tested for 3, 7, 14 and 28 days compressive strength. Then the compressive strength test results obtained from various dosages of activator and without activator are compared. Nyein Nyein Thant | Zin Mar Soe "The Effect of Dosage and Modulus of Activator on the Strength of Alkali Activated Slag and Fly Ash Based on Geopolymer Mortar" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-5 , August 2019, URL: https://www.ijtsrd.com/papers/ijtsrd27997.pdfPaper URL: https://www.ijtsrd.com/engineering/civil-engineering/27997/the-effect-of-dosage-and-modulus-of-activator-on-the-strength-of-alkali-activated-slag-and-fly-ash-based-on-geopolymer-mortar/nyein-nyein-thant
bubble-particle collision and attachment and detachment sub processes, implies that certain bubble size distributions have different effects over the flotation rates of coarse and fine particles
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Kyra Campbell (Imperial College London) - Understanding and Addressing Corrosion Due to Amine Solvents in Post-Combustion Carbon Capture Processes - UKCCSRC Cranfield Biannual 21-22 April 2015
Study of behaviour of concrete using waste materials as a partial substituteSwathy B
Concrete is a composite material that comprises basically of a binding medium, such as a blend of Portland cement and water, inside which are embedded particles or fragments of aggregate, usually a mixture of fine and coarse aggregate. The increase in population has resulted a rise in demand of housing and other construction works, which in turn led to a large shortage of building materials. As these conventional building materials consume a large amount of thermal and electrical energies during their production, the rate of pollution of the environment is also on the rise. This led to the research of building material substitutes, which at the same time doesn’t compromise the quality of the construction and also has eco-friendly properties. This study aims at utilization and to ascertain the suitability of rubber wood ash, crumb rubber, ceramic tile pieces as a partial replacement of cement, fine aggregate and coarse aggregate respectively in normal concrete. Initially properties of materials are analyzed. There after binder material is partially replaced by rubber wood ash at varying percentage 0 to 10%, at interval of 2.5% and tested for its workability and compressive strength for the age of 7 and 28 days. And the results were compared with those of conventional concrete to arrive at an optimum mix having maximum compressive strength. The replacement which gives more strength is chosen and the binder is fixed accordingly for further trials. Thereafter coarse aggregate and fine aggregates are partially replaced by ceramic tile pieces and crumb rubber respectively at varying percentages from 2 to 8% at intervals of 2% to find the optimum mix having maximum compressive strength. The strength and durability performance of these concrete with conventional concrete is studied. Qualitative analysis of waste substituted concrete is studied using XRD method. It was found that maximum strength properties was when fine aggregate and coarse aggregate was replaced up to 2% with crumb rubber and ceramic tile pieces along with 5% rubber wood ash as partial replacement of cement.
Keywords: Rubber wood ash, Crumb rubber, Ceramic tile pieces
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
Field Development Project : Gelama MerahHami Asma'i
A green field development project located in Sabah Basin comprises the whole upstream field development cycle from geology, reservoir studies to production facilities and economics. The objective is to come out with the best strategy to develop the field starting from our very own effort of reservoir characterization out of log and core data. Under supervision of lecturers, this project was completed as per scheduled.
Among new technical methodologies applied upon the completion this project:
1. Cubic Spline Interpolation Method in bulk volume calculation
2. Monte Carlo probabilistic method in reserve estimation
3. Reservoir Opportunity Index (ROI) method in well placement
Project was assessed by PETRONAS custodians.
The Effect of Dosage and Modulus of Activator on the Strength of Alkali Activ...ijtsrd
In this study, the effect of dosage and modulus of activator on the strength of alkali activated slag and fly ash based geopolymer mortar is studied. Fly ash from Tingyi is used. Blast furnace slag from No 1 Iron and Steel Industry, Pyin Oo Lwin is used. NaOH and Na2SiO3 are used as alkaline activator. Firstly, the physical properties of slag, fly ash and sand are tested. Alkali activated slag mortar is mixed with various proportion of activator. And the tests are made eight times with different activator dosage for slag mortar. Then the test is made once again without activator. Water slag cement ratio of 0.35 is used for this test. Fly ash based geopolymer mortar is mixed various proportion of activator. And the tests are made eight times with different activator dosage for fly ash based geopolymer mortar. Then the test is made once again without activator. Water fly ash ratio of 0.33 is used for this test. For both testing, samples are cured at 85°C for 24 hours and left at room temperature until the day of testing. The samples are tested for 3, 7, 14 and 28 days compressive strength. Then the compressive strength test results obtained from various dosages of activator and without activator are compared. Nyein Nyein Thant | Zin Mar Soe "The Effect of Dosage and Modulus of Activator on the Strength of Alkali Activated Slag and Fly Ash Based on Geopolymer Mortar" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-5 , August 2019, URL: https://www.ijtsrd.com/papers/ijtsrd27997.pdfPaper URL: https://www.ijtsrd.com/engineering/civil-engineering/27997/the-effect-of-dosage-and-modulus-of-activator-on-the-strength-of-alkali-activated-slag-and-fly-ash-based-on-geopolymer-mortar/nyein-nyein-thant
bubble-particle collision and attachment and detachment sub processes, implies that certain bubble size distributions have different effects over the flotation rates of coarse and fine particles
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Kyra Campbell (Imperial College London) - Understanding and Addressing Corrosion Due to Amine Solvents in Post-Combustion Carbon Capture Processes - UKCCSRC Cranfield Biannual 21-22 April 2015
Study of behaviour of concrete using waste materials as a partial substituteSwathy B
Concrete is a composite material that comprises basically of a binding medium, such as a blend of Portland cement and water, inside which are embedded particles or fragments of aggregate, usually a mixture of fine and coarse aggregate. The increase in population has resulted a rise in demand of housing and other construction works, which in turn led to a large shortage of building materials. As these conventional building materials consume a large amount of thermal and electrical energies during their production, the rate of pollution of the environment is also on the rise. This led to the research of building material substitutes, which at the same time doesn’t compromise the quality of the construction and also has eco-friendly properties. This study aims at utilization and to ascertain the suitability of rubber wood ash, crumb rubber, ceramic tile pieces as a partial replacement of cement, fine aggregate and coarse aggregate respectively in normal concrete. Initially properties of materials are analyzed. There after binder material is partially replaced by rubber wood ash at varying percentage 0 to 10%, at interval of 2.5% and tested for its workability and compressive strength for the age of 7 and 28 days. And the results were compared with those of conventional concrete to arrive at an optimum mix having maximum compressive strength. The replacement which gives more strength is chosen and the binder is fixed accordingly for further trials. Thereafter coarse aggregate and fine aggregates are partially replaced by ceramic tile pieces and crumb rubber respectively at varying percentages from 2 to 8% at intervals of 2% to find the optimum mix having maximum compressive strength. The strength and durability performance of these concrete with conventional concrete is studied. Qualitative analysis of waste substituted concrete is studied using XRD method. It was found that maximum strength properties was when fine aggregate and coarse aggregate was replaced up to 2% with crumb rubber and ceramic tile pieces along with 5% rubber wood ash as partial replacement of cement.
Keywords: Rubber wood ash, Crumb rubber, Ceramic tile pieces
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
6th International Conference on Machine Learning & Applications (CMLA 2024)ClaraZara1
6th International Conference on Machine Learning & Applications (CMLA 2024) will provide an excellent international forum for sharing knowledge and results in theory, methodology and applications of on Machine Learning & Applications.
Using recycled concrete aggregates (RCA) for pavements is crucial to achieving sustainability. Implementing RCA for new pavement can minimize carbon footprint, conserve natural resources, reduce harmful emissions, and lower life cycle costs. Compared to natural aggregate (NA), RCA pavement has fewer comprehensive studies and sustainability assessments.
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)
ASR.ppt
1. Durability of Portland Cement Concrete in Nebraska
Christopher Y. Tuan, Ph.D., P.E.
Associate Professor
and
Haosu Sun, Graduate Research Assistant
Department of Civil Engineering
Peter Kiewit Institute
University of Nebraska-Lincoln
April 30, 2003
2. Alkali-Silica Reaction (ASR)
Alkali-silica reaction is a chemical interaction between some
siliceous constituents of aggregates or particles of such
constituents in fine aggregate and hydroxyl ions.
alkali content + H2O→ alkaline solution
alkaline solution + reactive silica aggregate → silicate gel
CaO Ca2+
Na2O + H2O = 2Na+ + 2OH-
K2O 2K+
2NaOH + SiO2 + H2O = Na2SiO3• H2O
3. ASTM C1293
Water to total cementitious material ratio:
W/Cm=0.42~0.45
Alkalinity: Na2Oeq /Cement = 1.25%
Na2Oeq % = Na2O% + 0.658 x K2O%
Regular Test (1 year): Temp: 100.4 + 3.6OF
Relative Humidity: ≥ 95%
Accelerated Test ( 3 months): Temp: 140 + 3.6OF
Relative Humidity: ≥ 95%
4. One (1) source of limestone for coarse aggregate
Four (4) sources of fine aggregates (PE, PW, PC and RR)
Four (4) sources of cement (1 Type I, 1 Type IP/F, 1 high
alkali cement and 1 low alkali cement)
Two (2) sources of C ash (source A and source B)
One (1) source of F ash
One (1) source of ground slag
One (1) source of silica fume
Aggregates, Cements and Pozzolans
5. Total cementitious materials/yd3
concrete = 564 pounds
Baseline specimens with no additives
25% C ash
35% C ash
20% C ash + 3% silica fume
17% F ash
25% F ash
20% ground granulated blast furnace slag
Type 1P/F cement
3 pounds/yd
3
alkali loading
Mix Designs specified in the Test Program
6. Aggregate SiO2 Al2O3 Fe2O3 CaO MgO Na2O K2O LOI
Limestone 1.80 0.54 0.33 53.38 0.37 0.03 0.05 42.37
Platte River
East
80.70 10.20 0.73 0.80 0.094 1.30 4.60 0.29
Platte River
Central
83.50 8.00 0.72 1.60 0.11 1.20 3.40 0.64
Platte River
West
76.10 12.10 1.40 1.90 0.23 1.70 4.90 0.70
Republican
River
80.90 8.90 0.98 1.90 0.11 1.10 4.60 1.09
Chemical Composition of Aggregates
(by XRF Spectrometry, NDOR)
7. Mineral
Admixture
SiO2 Al2O3 Fe2O3 CaO MgO Na2O K2O SO3
Class C Fly Ash – A 38.53 17.63 5.55 24.15 4.96 1.23 0.52 1.86
Class C Fly Ash – B 30.84 16.21 6.09 27.70 4.85 1.38 0.30 2.13
Class F Fly Ash 54.24 14.20 6.55 13.67 3.55 1.66 2.05 0.74
Ground Slag 33.52 8.69 0.70 42.07 10.66 0.18 0.34 1.57
Silica Fume 93.20 0.26 0.23 0.62 0.18 0.079 0.64 0.24
Chemical Composition of Mineral Admixture
8. Mineral
Admixture
SiO2 Al2O3 Fe2O3 Sum of
Oxides
Na2O K2O Eq.
Alkali
SO3
Class C Fly Ash – A 38.53 17.63 5.55 61.71 1.23 0.52 1.57 1.86
Class C Fly Ash – B 30.84 16.21 6.09 53.14 1.38 0.30 1.58 2.13
Class F Fly Ash 54.24 14.20 6.55 74.99 1.66 2.05 3.01 0.74
ASTM C 618 –
Fly Ash for Use as Mineral Admixture in Concrete
Sum of oxides ≥ 50% for C fly ash; and ≥ 70% for F fly ash.
SO3 ≤ 5% for both C and F fly ash.
Na2Oeq ≤ 1.5%. (NDOR requires that Na2Oeq ≤ 1.9%)
LOI ≤ 6%.
9. Mineral
Admixture
SiO2 Al2O3 Fe2O3 Na2O K2O Eq.
Alkali
SO3
Ground Slag 33.52 8.69 0.70 0.18 0.34 0.40 1.57
Silica Fume 93.20 0.26 0.23 0.079 0.64 0.50 0.24
ASTM C 989 –
Ground Granulated Blast-Furnace Slag
for Use in Concrete
For ground slag:
SO3 ≤ 4%.
NDOR requires that Na2O ≥
0.6%.
ASTM C 1240 –
Silica Fume for Use in Hydraulic-Cement Concrete
10. Cement SiO2 Al2O3 Fe2O3 CaO MgO Na2O K2O LOI
Type I/II 20.62 4.30 3.09 63.11 3.06 0.16 0.61 1.23
Type IP/F 27.75 8.36 3.16 52.92 1.05 0.19 0.80 1.27
Type IP/N 25.27 9.62 3.07 53.92 2.39 0.13 0.75 1.69
High alkali 20.59 4.78 3.28 63.93 1.27 0.15 0.76 0.84
Low alkali 21.13 5.19 3.42 63.13 1.42 0.18 0.41 1.04
Chemical Composition of Cements
11. Cement Eq.
Alkali
SO3 C3S C2S C3A C4AF Blaine
Fineness
Type I/II 0.56 2.68 57 17 6.20 10.00 380
Type IP/F 0.71 2.80 --- --- 16.80 9.62 396
Type IP/N 0.62 3.13 --- --- 20.30 9.34 552
High alkali 0.66 2.92 58.65 14.79 7.10 9.98 384
Low alkali 0.45 3.17 47.61 24.66 8.00 10.41 370
Chemical Composition of Cements
Blaine fineness are given in m2/kg of cement.
12. Total Alkali Lime Silica
Cementitious Materials Na2Oeq CaO SiO2 [alkali + lime]/silica
I-BS 7.05 355.94 116.30 3.12
I-25CA 7.50 301.01 141.55 2.18
I-25CB 7.52 306.01 130.71 2.40
I-35CA 7.68 279.03 151.65 1.89
I-35CB 7.70 286.04 136.47 2.15
I-20CA-3SF 7.71 301.42 148.78 2.08
I-20CB-3SF 7.72 305.42 140.11 2.24
I-17F 8.74 308.54 148.53 2.14
I-25F 9.53 286.23 163.70 1.81
I-20BFS 6.09 332.21 130.85 2.58
IPF 7.05 298.47 156.51 1.95
HC-BS 7.05 360.57 116.13 3.16
HC-25CA 7.50 304.48 141.42 2.21
HC-25F 9.53 289.70 163.57 1.83
Total Alkali, Lime and Silica Contents of Cementitious Materials
ASTM C1293 intends to have Na2Oeq = 8.85 lbs/yd3.
New Mexico DOT study: with F ash, the ratio should be 1.45 ~ 1.75 to prevent ASR expansion.
25. Summary
1. All the C1293 specimens showed shrinkage, regardless of
moisture curing or not, in the range of 0.01~0.03 %.
(Prof. Mike Thomas confirms their tests showed comparable
shrinkage, especially with fly ash and slag specimens)
2. Durability tests have just started. The wet/dry and freeze-thaw
tests will dictate the timeline of the testing program.
3. Prof. Mike Thomas of U. of New Brunswick has received the
materials for C1293 parallel testing.
4. Data acquisition and analysis are on-going. The website will
be totally reconstructed shortly, and data will be posted.