Effect of Iron Ore Tailings as Fine Aggregate on Pore Structure of Mortars

2011 ◽  
Vol 250-253 ◽  
pp. 1017-1024 ◽  
Author(s):  
Lei Yu ◽  
Jing Song Tian ◽  
Jin Xi Zhang ◽  
Rong Jun Yang
Keyword(s):  
Pore Structure ◽  
Iron Ore ◽  
Fine Aggregate ◽  
Structure Parameters ◽  
Cement Concrete ◽  
Natural Sand ◽  
Iron Ore Tailings ◽  
Pore Structures ◽  
Fine Aggregates

Effect of iron ore tailings as fine aggregate on pore structure of mortars has been studied in this paper. The purpose is to investigate, as fine aggregate, comparing to natural sand, whether the iron ore tailings can improve the pore structures of mortars or not. Pore structure parameters were measured with the instrument of MIP and calculated with corollary software. The pore structure parameters from four kinds of mortars with different fine aggregates are compared with each other. This paper will provide more data about the use of this artificial aggregate, which may increase the feasibility of the use of this by-product in the mortar or cement concrete industry.

Relationships between Compressive Strength and Microstructure in Mortars with Iron Ore Tailings as Fine Aggregate

2012 ◽  
Vol 188 ◽  
pp. 211-218 ◽  
Author(s):  
Lei Yu ◽  
Jin Xi Zhang ◽  
Kai Mu
Keyword(s):  
Compressive Strength ◽  
Porous Structure ◽  
Pore Structure ◽  
Cement Paste ◽  
Iron Ore ◽  
Fine Aggregate ◽  
Structure Parameters ◽  
Cement Pastes ◽  
Iron Ore Tailings

In this study, the effect of Iron Ore Tailings (IOT), as fine aggregate in mortars, on microstructure and compressive strength with 14 days was observed on mortar specimens. The replacement ratios for IOT as fine aggregate were 60% and 100%. Pore structure parameters were measured with the instrument of MIP and calculated with corollary software. Situations of interface between aggregates and hard cement pastes were observed by FEI quanta 200 SEM. Consequently, it was seen that IOT can improve mortar’s compressive strength because of tighter interface between aggregate and hard cement paste and enhanced porous structure related to the finer structure of IOT comparing to reference sand.

scholarly journals The Use of Sheet Glass Powder as Fine Aggregate Replacement in Concrete

2010 ◽  
Vol 4 (1) ◽  
pp. 65-71 ◽  
Author(s):  
M. Mageswari ◽  
Dr. B. Vidivelli
Keyword(s):  
Sheet Glass ◽  
Glass Powder ◽  
Fine Aggregate ◽  
Test Results ◽  
Natural Sand ◽  
Aggregate Concrete ◽  
Fine Aggregates ◽  
Interesting Possibility ◽  
Compact State ◽  
Conservation Of Natural Resources

Sheet glass powder (SGP) used in concrete making leads to greener environment. In shops, near by Chidambaram many sheet glass cuttings go to waste, which are not recycled at present and usually delivered to landfills for disposal. Using SGP in concrete is an interesting possibility for economy on waste disposal sites and conservation of natural resources. This paper examines the possibility of using SGP as a replacement in fine aggregate for a new concrete. Natural sand was partially replaced (10%, 20%, 30%, 40% and 50%) with SGP. Compressive strength, Tensile strength (cubes and cylinders) and Flexural strength up to 180 days of age were compared with those of concrete made with natural fine aggregates. Fineness modulus, specific gravity, moisture content, water absorption, bulk density, %voids, % porosity (loose and compact) state for sand (S) and SDA were also studied. The test results indicate that it is possible to manufacture concrete containing Sheet glass powder (SGP) with characteristics similar to those of natural sand aggregate concrete provided that the percentage of SGP as fine aggregate is limited to 10-20%, respectively.

scholarly journals Different Formation Routes of Pore Structure in Aluminum Powder Metallurgy Alloy

Materials ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 3724 ◽  
Author(s):  
Jana Bidulská ◽  
Róbert Bidulský ◽  
Marco Actis Grande ◽  
Tibor Kvačkaj
Keyword(s):  
Plastic Deformation ◽  
Powder Metallurgy ◽  
Pore Structure ◽  
Structure Parameters ◽  
Technological Solution ◽  
Porosity Evolution ◽  
Angular Pressing ◽  
Pore Structures ◽  
Powder Metallurgy Alloy ◽  
Size And Morphology

In powder metallurgy (PM), severe plastic deformation (SPD) is a well-known technological solution to achieve interesting properties. However, the occurrence of pores in the final product may limit these properties. Also, for a given type of microstructure, the stereometric parameters of the pore structures, such as shape (represented by Aspect and Dcircle) and distribution (fshape, and fcircle), decisively affect the final properties. The influence of different processing routes (pressing, sintering and equal channel angular pressing (ECAP)) on pore structures in an aluminum PM alloy is discussed. The nature of porosity, porosity evolution and its behavior is explored. The correlation between pore size and morphology is also considered. The final pore structure parameters (Aspect, Dcircle, fshape, and fcircle) of studied aluminum alloys produced by different processing routes depends on the different formation routes.

Experimental Application Study on Iron Ore Tailings in the Mortar

2017 ◽  
Vol 873 ◽  
pp. 203-207
Author(s):  
Ying Jie Chen ◽  
Ying Wei Song ◽  
Gen Li ◽  
Teng Teng ◽  
Jian Xun Yang
Keyword(s):  
Iron Ore ◽  
Production Costs ◽  
Engineering Properties ◽  
Resource Exploitation ◽  
Natural Sand ◽  
Application Study ◽  
Experimental Application ◽  
Iron Ore Tailings ◽  
Tailings Sand ◽  
Massive Development

The development of the national economy has been always depended on natural resources. The massive development of resource has resulted in large amounts of waste, and tailings sand is one of them. How to change waste into treasure, to solve the contradiction between environmental protection, energy supply and resource exploitation, more and more attention has been payed on it. This paper combined the development situation of iron ore tailings at home and abroad, based on its engineering properties, make it used in mortar. After replacing the cement and natural sand of mortar, we studied the influence on the engineering properties of mortar which are compressive strength, workability, and water consumption. The experimental results show that when the tailings ofreplacingratio is in a certain range, the adding tailings produce beneficial effect on the performance of mortar, whichcan meet the engineering requirements, save production costs, and improve economic efficiency.

Investigation of Pore Structure for Manufactured Sand Mortar

2014 ◽  
Vol 534 ◽  
pp. 39-51
Author(s):  
Zheng Hong Tian ◽  
Jing Wu Bu
Keyword(s):  
Pore Structure ◽  
Pore Size ◽  
Water Saturation ◽  
Total Porosity ◽  
Threshold Region ◽  
Fine Aggregate ◽  
Test Results ◽  
Natural Sand ◽  
Manufactured Sand ◽  
Threshold Radius

This paper focuses on the pore structure parameters of mortars produced with manufactured sand and natural sand via water saturation and MIP methods. Test results show that, total porosity, as well as compressive strength, of manufactured sand mortar, is higher than that of natural sand mortar at fixed w/c and s/c ratio. Furthermore, considerable volume of large pores present in specimens of manufactured sand at higher w/c ratio rather not at the lower w/c ratio, which caused by the larger binder-aggregate interface. Manufactured fine aggregate in mortar probably accelerate hydrated reaction of cement, which result in the most probable pore size is finer than that of natural sand mortar. It can be concluded that the threshold region becomes flatten and threshold radius increases due to the aggregate volume concentration rises. Finally, a new theoretical model with a double-lognormal distribution function is demonstrated to be reasonable to fit pore size distribution in mortars.

scholarly journals “Experimental Analysis of M35 Concrete with Partial Substitute of Fine Aggregate by Nylon Glass Filled Granules and Cement by Flyash”

2019 ◽  
Vol 9 (1) ◽  
pp. 4469-4474
Keyword(s):  
Tensile Strength ◽  
Construction Industry ◽  
Experimental Analysis ◽  
Steel Fiber ◽  
Partial Replacement ◽  
Fine Aggregate ◽  
Natural Sand ◽  
Conventional Concrete ◽  
Fine Aggregates ◽  
Hardened Properties

Concrete is a material which widely used in construction industry. The present investigation deals with the study of partial replacement of fine aggregate by Nylon Glass Granules in concrete. The fine aggregates are replaced by 0%, 10%, 20% and 30% by Nylon Glass Granules by volume of natural sand in M35 grade of concrete. Additionally, to increase the tensile strength of concrete 1% of Steel Fiber by volume of cement were added to all the mixes containing Nylon Glass Granules. The concrete produced by such ingredients were cured for 7 and 28 days to evaluate its hardened properties. The 28days hardened properties of concrete revealed that maximum strength is observed for the mix which possesses 20% replacement of fine aggregate by Nylon Glass Granules compared with the conventional concrete, thus it is said to be the optimum mix

scholarly journals Utilization of Iron Tailings Sand as an Environmentally Friendly Alternative to Natural River Sand in High-Strength Concrete: Shrinkage Characterization and Mitigation Strategies

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5614
Author(s):  
Zhiqiang Zhang ◽  
Zhilu Zhang ◽  
Shaoning Yin ◽  
Linwen Yu
Keyword(s):  
Iron Ore ◽  
Autogenous Shrinkage ◽  
Drying Shrinkage ◽  
High Strength ◽  
Mitigation Strategies ◽  
Fine Aggregate ◽  
River Sand ◽  
Super Absorbent Polymer ◽  
Iron Ore Tailings ◽  
Tailings Sand

The increasing annual emissions of iron ore tailings have proved a great threat to the natural environment, and the shortage of natural river sand, as well as the pursuit of sustainable development materials, provides motivation to reuse iron ore tailings as a fine aggregate in concrete. Due to the significantly different properties of iron tailings sand compared with natural river sand—such as the higher density, higher content of limestone particles smaller than 75 μm and its rough and angular shape—concretes prepared with iron tailings sand show remarkably higher shrinkage. This study presents the shrinkage characterization and shrinkage-reducing efficiency of three different methods on iron tailings, sand concrete and river sand concrete. The internal humidity was also monitored to reveal the shrinkage-reducing mechanism. The obtained results indicated that the autogenous and total shrinkage of iron tailings sand concrete were 9.8% and 13.3% higher than the river sand concrete at the age of 90 d, respectively. The shrinkage reducing agent (SRA) was the most effective shrinkage reducing method for river sand concrete, while for iron tailings sand concrete, super absorbent polymer (SAP) and controlled permeable formwork liner (CPFL) it worked best on autogenous shrinkage and drying shrinkage, respectively. Furthermore, the shrinkage mitigation strategies worked earlier for the drying shrinkage behavior of iron tailings sand concrete, while no such condition could be found for autogenous shrinkage.

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