Experimental Research on Durabilities of Coal Gangue Concrete

2011 ◽  
Vol 306-307 ◽  
pp. 1569-1575 ◽  
Author(s):  
Jin Min Guo ◽  
Ling Li Zhu
Keyword(s):  
Fly Ash ◽  
Experimental Research ◽  
Compression Strength ◽  
Modulus Of Elasticity ◽  
Orthogonal Experiment ◽  
Sem Analysis ◽  
Coal Gangue ◽  
Freeze Thaw ◽  
Basic Properties ◽  
Loss Of Strength

Basing on basic properties of coal gangue from No.1 mine of Pingdingshan Tian’an coal group, authors made coal gangue concrete with coal gangue instead of some aggregate, fly ash and slag instead of some cement. Coal gangue concrete was studied by the method of orthogonal experiment. Compression strength, its loss of strength after corrosion by sulphate, modulus of elasticity and its loss after freeze-thaw were analyzed. Optimum mix of coal gangue concrete was given by the integrated balance method. And Finally, SEM analysis on coal gangue concrete was researched. According to the experiment, Sulfate attacking on coal gangue concrete was little.

Experimental Research on Osmotic Coefficient of Gangue Concrete

2011 ◽  
Vol 99-100 ◽  
pp. 866-869
Author(s):  
Jin Min Guo ◽  
Shuai Qi Song ◽  
Ling Li Zhu
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Experimental Research ◽  
Compression Strength ◽  
Building Material ◽  
Osmotic Coefficient ◽  
Good Condition ◽  
Green Building ◽  
Orthogonal Test ◽  
Coal Gangue

Permeability of concrete was an important part of durability. Osmotic coefficient of gangue concrete was studied by orthogonal test. The test analyzed the influence of coal gangue, fly ash and slag in place of aggregate and cement on osmotic coefficient of concrete. The results showed that compression strength was highest and osmotic coefficient was lowest when gangue was in place of 30% aggregate, fly ash was instead of 20% cement, slag took the place of 20% cement. And gangue in place of some aggregate had biggest influence on the osmotic coefficient in coal gangue concrete. At the same time, its mechanical properties and permeability were controlled in a good condition. Finally, the results could provide useful technical reference to exploit the green building material from gangue.

Experimental Research on Coal Gangue Grouting Material for Gob Filling

2013 ◽  
Vol 357-360 ◽  
pp. 1158-1166
Author(s):  
Tian Feng Gu ◽  
Zhong Di Sun ◽  
Feng Tao Luo ◽  
Kang Guo ◽  
Ya Ming Liu ◽  
...  
Keyword(s):  
Fly Ash ◽  
Compression Strength ◽  
Raw Materials ◽  
Setting Time ◽  
Blended Cement ◽  
Coal Gangue ◽  
Activation Process ◽  
Initial Setting Time ◽  
Wide Range ◽  
Coal Gob

Grouting fill is one of the main methods of coal gob treatment. The grouting properties directly affect the effect of grouting treatment. Cement-fly ash grout is widely used in the treatment of coal gob. But in many gob grouting fill projects, due to the lack of fly ash, we need to look for other low-cost grouting materials. Study was made through laboratory experiment on the properties of cement-coal gangue materials used for the gob grouting. In this paper, the correlation of water-solid ratio, cement content, admixture, concretion compression strength, setting time, viscosity, water segregation rate and hardening rate is discussed in the case of use of large gangue content cement. The test results show that compared with the grout not go through the activation process, the blended cement grout mixed with coal gangue powder activated by low temperature and mechanical crushing has high concretion compression strength. Water glass has a great effect on the viscosity, initial setting time and final setting time, which can be used to adjust the grout properties to accommodate grouting environment requirements. This grout has the advantage of wide range sources of raw materials, and can be used to solve the lack of fly ash and gangue resource utilization problems.

An Environmentally Sound Usage of both Coal Mining Residue and Sludge

2011 ◽  
Vol 183-185 ◽  
pp. 595-599 ◽  
Author(s):  
Kui Mei Qian ◽  
Li Zhang ◽  
Li Ping Wang
Keyword(s):  
Fly Ash ◽  
Arbuscular Mycorrhiza ◽  
Coal Mining ◽  
Experimental Research ◽  
Toxic Element ◽  
Coal Gangue ◽  
Mixture Ratio ◽  
Arbuscular Mycorrhiza Fungi ◽  
Environmentally Sound ◽  
Wasteland Reclamation

This study reported the test done on coal gangue-fly ash-sludge mixture for mine wasteland reclamation in pot experiments. According to the characteristic of coal gangue, fly ash and sludge, they were mixed as the complex substrate for reclamation of mine wasteland; meanwhile, arbuscular mycorrhiza fungi (AMF) was also introduced to the reclamation of mine wasteland. The experimental research of the complex substrate and AMF in mine wasteland reclamation was conducted. The results indicated that coal gangue-fly ash-sludge mixture ratio studies revealed that 2: 6: 2 fly ash-coal gangue-sludge mixtures was the optimum mixture ratio that minimized toxic element and provided sufficient nutrients. It resulted that appropriate ratio of the three composite can effectively promote the reclamation, and increase the nutrients absorption of plants, providing a reference for ecological utilization of coal gangue, and fly ash and sludge. In addition, inoculation with AMF in the presence of sludge in mining reclamation was essential for the promotion of plant absorption of nutrients.

Experimental Research of Rebound Detection in Steel Fiber Concrete

2014 ◽  
Vol 578-579 ◽  
pp. 1108-1112 ◽  
Author(s):  
Jian Feng Ye ◽  
Hua Yan Chen ◽  
Xian Shun Bi
Keyword(s):  
Regression Analysis ◽  
Fly Ash ◽  
Experimental Research ◽  
Compression Strength ◽  
Steel Fiber ◽  
Detection Method ◽  
Fiber Concrete ◽  
Testing Data ◽  
Steel Fiber Concrete ◽  
Set Up

For the application into country point highway of Xiamen to Kunming, a series of the C40 concrete with fly ash and slag have been studied by rebound detection and compression strength, the detecting wave of rebound value and compression strength is set up by regression analysis of the testing data. It is shown from the example that the compression strength and rebound value have good relativity, this rebound detection method used in steel fiber concrete is simple and practical.

Influence of Fly Ash Type on Material Properties of Cement Paste

2014 ◽  
Vol 969 ◽  
pp. 212-217 ◽  
Author(s):  
Pavel Padevět ◽  
Tereza Otcovská ◽  
Ondřej Zobal
Keyword(s):  
Tensile Strength ◽  
Fly Ash ◽  
Cement Paste ◽  
Compression Strength ◽  
Material Properties ◽  
Modulus Of Elasticity ◽  
Volume Weight ◽  
Strength In Bending

Paper describes properties of cement paste included addition various kinds of the fly ash. Firstly is described the preparation of the cement paste. Next part is focused on the testing of the properties. Results of the testing are summarized in properties like a compression strength, Modulus of elasticity and tensile strength in bending. Finally the relation between material properties and volume weight is discussed. An article is described paste made from the same amount of cement and fly ash and water coefficient of 0.4.

High Temperatures - Influence on the Material Properties of Cement Paste with Fly Ash

2013 ◽  
Vol 742 ◽  
pp. 187-191 ◽  
Author(s):  
Pavel Padevět ◽  
Romana Lovichová
Keyword(s):  
Fly Ash ◽  
High Temperatures ◽  
Cement Paste ◽  
Compression Strength ◽  
Material Properties ◽  
Modulus Of Elasticity ◽  
Volume Weight ◽  
Strength In Bending

Paper describes properties of cement paste included addition of the fly ash. Firstly is described the preparation of the cement paste. Next part is focused on the testing of the properties. Results of the testing are summarized in properties like a compression strength, Modulus of elasticity and strength in bending. Finally the relation between material properties and volume weight is discussed. An article is described paste made from the same amount of cement and fly ash and water coefficient of 0.4.

Study on the Freezing Resistance of HFCC

2011 ◽  
Vol 308-310 ◽  
pp. 2555-2559
Author(s):  
Hong Mei Ai ◽  
Pu Guang Lu ◽  
Jun Ying Bai ◽  
Jing Jing Wei
Keyword(s):  
Fly Ash ◽  
Compression Strength ◽  
Ash Content ◽  
Freezing Resistance ◽  
Cycle Times ◽  
Freeze Thaw ◽  
Thaw Cycle ◽  
Freeze Thaw Cycle ◽  
Binder Ratio ◽  
Water Binder Ratio

To the High fly-ash content concrete(abbreviated HFCC) whose fly-ash adding amount is 50%~70%, the influence of actual water-binder ratio, fly-ash content, quality of fly-ash and compression strength on the freezing resistance of HFCC were studied; The critical freeze-thaw cycle times in this paper involved with mass loss rate Wn=5% and relative dynamic elastic modulus P=60%, the relationship between the critical freeze-thaw cycle times and the 28d compression strength of HFCC was analyzed; To HFCC without air-entraining agent, the experiment results showed that the freezing resistance decreased with the increase of actual water-binder ratio, the increase of fly-ash content and the reduce of fly-ash quality. The freeze-thaw damage of HFCC dues to the freeze-thaw degradation results from surface denudation.

scholarly journals Study on Filling Material Ratio and Filling Effect: Taking Coarse Fly Ash and Coal Gangue as the Main Filling Component

2019 ◽  
Vol 2019 ◽  
pp. 1-11
Author(s):  
Changxiang Wang ◽  
Yin Liu ◽  
Hao Hu ◽  
Yangyang Li ◽  
Yao Lu
Keyword(s):  
Fly Ash ◽  
Material Selection ◽  
Orthogonal Experiment ◽  
Coal Gangue ◽  
Environmental Benefits ◽  
Filling Material ◽  
Range Analysis ◽  
Filling Materials ◽  
Filling Simulation ◽  
Main Component

Filling mining is an effective way to settle the dilemma of “Three Down and One Above” in coal mining. Fly ash and coal gangue can be used as filling materials with significant social, economic, and environmental benefits. Using coarse fly ash base as cementing material and coal gangue as aggregate, orthogonal experiment of filling paste was conducted in this study. The range analysis was performed for the strength and transportation requirements of filling paste, and the optimum proportion was determined by the comprehensive balance method. In order to verify the filling effect, a dynamic filling simulation device was designed, and a comparative simulation test of caving mining and dynamic filling mining was carried out. Results show that the filling paste with fly ash and coal gangue as the main component can meet the requirements of filling design and application. This research provides a reference for the material selection and proportion design of paste filling.

An Experimental Study on the Frost Resistance of High Performance Concrete Using Fly-Ash and Agent

2017 ◽  
Vol 904 ◽  
pp. 179-184
Author(s):  
Seung Jo Lee
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Fly Ash ◽  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
Frost Resistance ◽  
High Performance ◽  
High Performance Concrete ◽  
Strength Increase ◽  
Freeze Thaw

The purpose of this study is to investigate the freeze-thaw resistance, one of the most important durability indicators, of high-performance concrete made of fibers (nylon and polypropylene), AE agent, viscosity agent, and fly ash, an industrial by-product. While FN-1 showed the best freeze-thaw resistance with an about 2.8% relative dynamic modulus of elasticity, PV-2 showed the worst results, with an about 7.4% modulus, in comparison tests with GC. Most of the test samples showed better compressive strength than GC. Especially, N-1 showed the greatest compressive strength increase of 8%. Also, the test samples mixed with FA and PP showed a 2-4% compressive strength increase effect.

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