The Pore Structure Multifractal Research of Low Silicon Sinter

2013 ◽  
Vol 750-752 ◽  
pp. 2221-2224
Author(s):  
Qing Jun Zhang ◽  
Qing Liu ◽  
Chun Liang Yan ◽  
Yu Zhu Zhang
Keyword(s):  
Pore Structure ◽  
Fractal Theory ◽  
Multifractal Spectrum ◽  
Mercury Intrusion ◽  
Metallurgical Properties ◽  
Multifractal Theory ◽  
Different Content ◽  
The Relationship

With the combination of fractal theory and metallurgical properties of low silicon sinter, the influence of metallurgical properties in different content of R, MgO, SiO2 and C is analyzed on the condition of existing experiment and fuel, and by using the mercury intrusion machine it measured the volume of micro-pore structure after broken of low silicon sinter; and it combined with the multifractal theory measured multifractal spectrum for the pore structure, which is established the relationship between with the metallurgical properties and fractal theory.

scholarly journals The Evolutionary Characteristics of Reservoir Microstructure under Long-Term Waterflooding Development and Its Fractal Description

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Fengjiao Wang ◽  
Xu Wang ◽  
Yikun Liu ◽  
Qingjun Deng ◽  
Jianjun Xu ◽  
...  
Keyword(s):  
Pore Structure ◽  
Physical Simulation ◽  
Structural Parameters ◽  
Fractal Theory ◽  
Evolution Model ◽  
Structure Evolution ◽  
Before And After ◽  
Water Cut ◽  
The Relationship

Generally, long-term waterflooding development often leads to the change of reservoir pore and clay mineral composition, which results in the change of permeability and wettability. In order to explore the relationship between core micropore structure and water cut, based on physical simulation experiments and fractal theory, we proposed a fractal evolutionary model to describe the evolution characteristics of microstructure of long-term water driving reservoirs. In this paper, core pore structure by SEM was first conducted to analyze the change of core pore structure before and after waterflooding under the conditions of magnification of 200 times, 800 times, and 2000 times, respectively. Then, conventional and constant rate mercury injection tests were combined to perform the comparative analysis of core structural parameters before and after waterflooding. Finally, a micropore-throat structure evolution model of core was established. Research shows that the connectivity of larger pores becomes better after long-term water driving, the degree of heterogeneity weakens, and the micro heterogeneity of small pores becomes stronger and stronger. The throat characteristics change in a complex manner, the radius tends to increase, and the sorting becomes better, while the connectivity of small throat changes complex. In general, the heterogeneity of throat increases with the time of water injection in reservoirs with low porosity and permeability. On the basis of fractal theory and variation characteristics of rock pore structure in water driving reservoirs, we have established a micropore-throat structure evolution model of core pore-throat characteristics. This fractal evolution model quantitatively characterized the complexity and evolution law of pore structure and clarified the relationship between fractal dimension of core pore structure and water cut under different stages of water driving.

scholarly journals Capillary Water Absorption and Micro Pore Connectivity of Concrete with Fractal Analysis

Crystals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 892
Author(s):  
Xiangqun Ding ◽  
Xinyu Liang ◽  
Yichao Zhang ◽  
Yanfeng Fang ◽  
Jinghai Zhou ◽  
...  
Keyword(s):  
Pore Structure ◽  
Water Absorption ◽  
Fractal Theory ◽  
Mineral Admixtures ◽  
Capillary Water ◽  
Capillary Water Absorption ◽  
Connectivity Probability ◽  
Fractal Characteristics ◽  
Different Diameters ◽  
The Relationship

This study focuses on the relationship between the complexity of pore structure and capillary water absorption of concrete, as well as the connection behavior of concrete in specific directions. In this paper, the water absorption of concrete with different binders was tested during the curing process, and the pore structure of concrete was investigated by mercury intrusion porosimetry (MIP). The results show that the water absorption of concrete with mineral admixtures is lower, mainly due to the existence of reasonable pore structure. The effect of slag on concrete modification is more remarkable comparing with fly ash. In addition, the analysis shows that the pore with different diameters has different fractal characteristics. The connectivity probability and water absorption of unidirectional chaotic pore are linearly correlated with the pore diameter of 50–550 nm, and the correlation coefficient reaches a very significant level, and detailed analysis was undertaken to interpret these results based on fractal theory.

scholarly journals Study on the Relationship between Pore Structure and Uniaxial Compressive Strength of Cemented Paste Backfill by Using Air-Entraining Agent

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Fengwen Zhao ◽  
Jianhua Hu ◽  
Dongjie Yang ◽  
Ye Kuang ◽  
Hongxing Xiao ◽  
...  
Keyword(s):  
Pore Structure ◽  
Fractal Theory ◽  
Total Pore Volume ◽  
Linear Increase ◽  
Theory Analysis ◽  
Structure Changes ◽  
Small Pore ◽  
Paste Backfill ◽  
Air Entraining Agents ◽  
The Relationship

To control pores in the backfill, the air-entraining agents (AEAs) are used as an admixture to realize the pore structure changes under artificial action and explore the effect of pore structure on strength. Two AEAs at different dosages were added to the backfill. The relationship was then analyzed between them from the macro- and mesoscopic aspects. The results indicate that AEA can regulate pore structure changes of AEACPB. With the increase in AEA content, the total pore volume of different pore sizes in AEACPB increases, in which the proportion of big and medium pore gradually increases while the proportion of small pore gradually decreases. The AEACPB’s UCS is linearly negatively correlated with the porosity and pore percentage, which is the primary factor affecting the AEACPB of the pore structure. When the total pores’ volume in the AEACPB is constant, the influence of different pore structures differs. A higher proportion of small pores leads to a linear increase in strength; a higher proportion of medium pores leads to a linear decrease in strength; and a higher proportion of big pores leads to an exponential decrease in strength. And the fractal dimension has a linear negative correlation with the UCS by fractal theory analysis.

Study on the Influence of Air-Entraining Agent on the Impermeability of Cement-Based Composites Based on its Pore Structure by Fractal Theory

2010 ◽  
Vol 168-170 ◽  
pp. 615-618
Author(s):  
Zhi Qin Du ◽  
Wei Sun
Keyword(s):  
Fractal Dimension ◽  
Pore Structure ◽  
Mercury Intrusion Porosimetry ◽  
Fractal Theory ◽  
Mercury Intrusion ◽  
Pore Structures ◽  
Cement Based Materials

The effect of different quantity of air-entraining agent on the impermeability of cement-based materials are studied in this paper. Impermeability test and mercury intrusion porosimetry (MIP) method were used to characterize the impermeability and pore structures. The fractal dimension is used to describe the characteristic of pore structure and calculated by the data of MIP experiment. The result shows that owing to the improvement of pore structure, the impermeability performance of the cement-based composites is noticeably enhanced when air-entraining agent is added with appropriate quantity.

Fractal Characters of Micro-Pores in the Sinter

2011 ◽  
Vol 197-198 ◽  
pp. 662-666
Author(s):  
Qing Jun Zhang ◽  
Wen Ling Mo ◽  
Yuan Liang Li ◽  
Yu Zhu Zhang
Keyword(s):  
Fractal Structure ◽  
Mercury Intrusion Porosimetry ◽  
Fractal Theory ◽  
Mercury Intrusion ◽  
Relationship Of ◽  
The Relationship ◽  
Important Character

The pore in the sinter is an important character. Because of multiphase and asymmetry in the sinter, the structure of the pore is very complex. To study the character of the pore effectively, the method of mercury intrusion porosimetry is applied to measure the pore in the sinter, and the results are dealt with by the fractal theory. The results prove that the pores in the sinter are actually fractal structure when the size of the pores is more than 204.5 nm because their curves in the log-log plot are linear, and some curves qualified with the linearity obviously possess of the segment linearity character. According to the calculation of the fractal D, the relationship of the strength and fractal D will be established.

Effect of Super Slag Powder on Pore Structure and Compressive Strength of RPC

2010 ◽  
Vol 150-151 ◽  
pp. 1214-1219
Author(s):  
Ping Zhang ◽  
Qiu Yi Li ◽  
Tie Jun Zhao ◽  
Xiang Xin Xue
Keyword(s):  
Grain Size ◽  
Compressive Strength ◽  
Specific Surface ◽  
Pore Structure ◽  
Mercury Intrusion Porosimetry ◽  
Mercury Intrusion ◽  
Slag Powder ◽  
Binder Ratio ◽  
The Relationship ◽  
Water Binder Ratio

This paper deals with RPC produced by superfine slag powder(measured specific surface area is 1824 m2/kg) and natural sands with a low water-binder ratio(0.2 or so),which strength can achieve 100MPa after 28d standand curing. An analysis,based on the mercury intrusion porosimetry,is made of the relationship between strength and pore structure parameters.The results show that the strength can be improved in the range of 30～45%, when the dosage of superfine slag powder varied from 5% to 15%；the linearity between compressive strength,water-binder ratio and the hole with a daimetre larger than 100nm are 0.72 and 0.92 respectively;and the RPC’s 28-day compressive strength produced by the natural sands, with a maximum grain size of 4.75 mm,is almost equal to the RPC produced by standard sands.

Analysis of Collapsible Loess Microstructure at Fractal Theory Based

2012 ◽  
Vol 204-208 ◽  
pp. 614-617
Author(s):  
Ming Yuan Shi ◽  
Zong Fang Chen ◽  
Hong Yan Zhang
Keyword(s):  
Fractal Dimension ◽  
Pore Structure ◽  
Linear Relationship ◽  
Pore Radius ◽  
Fractal Theory ◽  
Fractal Characteristic ◽  
Geological Age ◽  
Collapsible Loess ◽  
Fractal Character ◽  
The Relationship

On the basis of publicized data, the fractal character of pore structure in loess is studied. We have determined fractal characteristic pore radius and discussed the relationship between fractal character values and collapsibility. Results show that there is a good linear relationship between and collapsibility, and fractal dimension can reflect geological age of loess section.

Experimental Analysis of Relationship between Pore-Structure and Frost-Resistance of Concrete

2012 ◽  
Vol 174-177 ◽  
pp. 117-120
Author(s):  
Ying Zhang ◽  
Jiang Dong Cai ◽  
Shan Lin Xu ◽  
Zhi Jun Hu
Keyword(s):  
Pore Structure ◽  
Frost Resistance ◽  
Concrete Strength ◽  
Freezing Resistance ◽  
Mercury Intrusion ◽  
Increasing Trend ◽  
Binder Ratio ◽  
Early Strength ◽  
The Relationship ◽  
Water Binder Ratio

The influence of admixture on concrete pore structure was analyzed by using the mercury intrusion method and the rapid frozen-thaw method under the condition of the same water/binder ratio in this paper, and thus the relationship between pore structure and frost resistance of concrete were analyzed. When the compound mineral ad-mixture is mixed, the porosity rate of concrete can be decreased and the harmful hole is in-creased, the less-harm hole and the no-harmful hole are decreased. The early strength of concrete is not decreased. But the strength has the increasing trend in the late, which is more favorable for the impermeability and corrosion resistance. But the improvement of the freezing resistance is not obvious. The admixture of air entraining agent can increase the porosity and more-harmful hole, and the concrete strength will be decreased, which will be not favorable for the freezing resistance of concrete. If these two substances are admixed at the same time, the concrete porosity is increased, and the pore size distribution of concrete can be reasonable. The decrement of concrete strength is not obvious, but it is favorable for the freezing resistance of concrete.

scholarly journals Review on Fractal Analysis of Porous Metal Materials

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
J. Z. Wang ◽  
J. Ma ◽  
Q. B. Ao ◽  
H. Zhi ◽  
H. P. Tang
Keyword(s):  
Fractal Dimension ◽  
Pore Structure ◽  
Fractal Analysis ◽  
Material Characterization ◽  
Fractal Theory ◽  
Porous Metal ◽  
Processing Method ◽  
The Past ◽  
Metal Materials ◽  
The Relationship

Porous metal materials are multifunctional lightweight materials and have been used widely in industry. The structural and functional characters of porous metal materials depend on the pore structure which can be described effectively by the fractal theory. This paper reviews the major achievements on fractal analysis of pore structure of porous metal materials made by State Key Laboratory of Porous Metal Materials, China, over the past few years. These include (i) designing and developing a set of novel fractal analytical software of porous metal materials, (ii) the influence of material characterization and image processing method on the fractal dimension, and (iii) the relationship between the material performance and the fractal dimension. Finally, the outlooks of fractal theory applied in porous metal materials are discussed.

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