Orthogonal Test of Characteristics of Complex Cememting Material of FGD Gypsum-Fly Ash

2011 ◽  
Vol 250-253 ◽  
pp. 460-463
Author(s):  
Yi Zhang ◽  
Xin Tang Wang ◽  
Ming Zhou ◽  
Wan Zhen Wang
Keyword(s):  
Fly Ash ◽  
Orthogonal Test ◽  
Test Method ◽  
Experimental Results ◽  
Mineral Admixtures ◽  
Fgd Gypsum ◽  
Slag Powder ◽  
Mix Proportion ◽  
Orthogonal Test Method ◽  
Cementing Material

Orthogonal test method is used to study the effect of the mineral admixtures on the performance of FGD gypsum-fly ash complex cementing material. On the basic experiment, the effect of the traditional alkali and salt admixtures added to the complex cementitious system is discussed, the factors effecting on performance of the FGD gypsum were analyzed. Based on the experimental results, the best mix proportion was determined. Finally, the basic performance of complex cementitious material was tested. The experimental results show that the performance of FGD gypsum which is activated through adding the compound admixtures was similar with the ordinary interior wall materials. The strength and water resistance of FGD gypsum complex cementing material can be greatly enhanced by adding cement, quicklime and slag powder, and effect of cement is largest, and slag smallest. The performance of the gypsum complex cementing material also can be improved after incorporation of a few of chemical admixture on the basis of adding mineral activators.

Study of Effect of Chemical Activators and Mineral Admixtures on the Strength of HFGD Gypsum - Fly Ash Cementing Material

2011 ◽  
Vol 71-78 ◽  
pp. 3725-3728
Author(s):  
Xin Tang Wang ◽  
Yi Zhang ◽  
Jie Yin ◽  
Zhi Guo Xie
Keyword(s):  
Fly Ash ◽  
Power Plant ◽  
Raw Materials ◽  
Experimental Results ◽  
Mineral Admixtures ◽  
Single Factor ◽  
Related Factors ◽  
Fgd Gypsum ◽  
Cementing Material ◽  
Hemi Hydrate

A kind of FGD gypsum from Ningbo Beilun Power Plant of China and fly ash were used as the raw materials with which a complex cementing material was made. Effect of the related factors such as water proportion, mineral admixtures and chemical activators on characteristics of Hemi-hydrate FGD gypsum-fly ash complex cementing material is studied through a number of single factor experiments. The experimental results show that an appropriate amount of admixtures can effectively improve the strength of the Hemi-hydrate FGD gypsum–fly ash complex cementing material presented here. It is concluded that the strength of HFGD-FACM is best as the ratio of HFGD gypsum and fly ash is 1:1 and proper water aggregate proportion is 0.45~0.50.

Effect of Mineral Admixtures and Chemical Activators on the Strength of FGD Gypsum-Fly Ash Complex Cementing Material

2011 ◽  
Vol 250-253 ◽  
pp. 469-473
Author(s):  
Xin Tang Wang ◽  
Ming Zhou ◽  
Yi Zhang
Keyword(s):  
Fly Ash ◽  
Raw Materials ◽  
Mineral Admixtures ◽  
Material Strength ◽  
Single Factor ◽  
Related Factors ◽  
Fgd Gypsum ◽  
Mix Proportion ◽  
Optimal Mix ◽  
Cementing Material

A kind of FGD gypsum from Ningbo Beilun Power Plant of China and fly ash were used as the raw materials with which a complex cementing material was made. Effect of the related factors such as paste material, water proportion, mineral admixtures (Cement, CaO) and chemical activators (NaOH, CaCl2, Na2SiO3, K2SO4) on characteristics of FGD gypsum-fly ash complex cementing material (noted as FGD-GFCM) is studied through a large number of single factor experiments. The additives with significant effect were chosen and the optimal mix proportion was determined. The experimental results show that an appropriate amount of admixtures can effectively improve the strength of the FGD gypsum–fly ash complex cementing material presented here. It is concluded that the strength of FGD-GFCB for 28d is best as the ratio of gypsum and fly ash is between 2:3 and 1:1 and water aggregate proportion is inversely proportional to the cementing material strength and apparent density of it.

Research on Surface Roughness of Ultrasonic Polishing without Abrasive Based on Orthogonal Experiments

2009 ◽  
Vol 416 ◽  
pp. 133-136
Author(s):  
Jian Jun Jiang ◽  
Jian Xin Zheng ◽  
Chuan Shao Liu
Keyword(s):  
Surface Roughness ◽  
Feed Rate ◽  
Lower Surface ◽  
Orthogonal Test ◽  
Test Method ◽  
Experimental Results ◽  
Polished Surface ◽  
Orthogonal Experiments ◽  
Orthogonal Test Method ◽  
Conventional Rolling

Experiments of ultrasonic polishing the 45# steel shaft without abrasive are carried out by using orthogonal test method to study the polished surface roughness, and experimental results are analyzed with range method. The influence of polishing parameters on the polished surface roughness could be arranged as follows: feed rate, power of generator, preload pressure and radius of the tool head, in which the feed rate brings the most remarkable influence on the polished surface roughness. The surface roughness value reduces at first and then increases when the radius of tool head, preload pressure and power of the generator increase. The surface roughness value increases with the feed rate. Comparative experimental results of ultrasonic polishing without abrasive and the conventional rolling indicate that lower surface roughness value may be obtained by ultrasonic polishing without abrasive.

Numerical simulation and application of entrainment dust collector for fully mechanized mining support based on orthogonal test method

2021 ◽  
Vol 380 ◽  
pp. 553-566
Author(s):  
Wenjing Yin ◽  
Gang Zhou ◽  
Dong Liu ◽  
Qunzhi Meng ◽  
Qian Zhang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Orthogonal Test ◽  
Test Method ◽  
Dust Collector ◽  
Orthogonal Test Method

Preparation of FGD Gypsum-Fly Ash Plaster Material

2013 ◽  
Vol 327 ◽  
pp. 28-31
Author(s):  
Jiang Zhu ◽  
Guo Zhong Li ◽  
Chuan Wei Du
Keyword(s):  
Fly Ash ◽  
Citric Acid ◽  
Material Properties ◽  
Reducing Agent ◽  
Mass Ratio ◽  
Sodium Metaphosphate ◽  
Fgd Gypsum ◽  
Mix Proportion ◽  
Gypsum Plaster ◽  
Bone Glue

FGD gypsum-fly ash plaster material was prepared by desulfurization gypsum plaster and fly ash as main materials, compound retarder A (composed of citric acid, sodium metaphosphate and borax), methylcellulose (MC) as super absorbent polymers (SAP) and water reducing agent of lignosulfonate. Mix proportion was determined through studying effects of the experimental factors, including fly ash mixing amount, retarders of citric acid, bone glue and compound retarder A, and SAP of MC and dextrin, on plaster material properties. Final mix proportion was followed as: FGD gypsum to fly ash mass ratio of 4.0, compound retarder of 0.2%, methylcellulose of 0.2% and lignosulfonate of 0.1%.

Effect of steel slag powder, fly ash, and silica fume on the mechanical properties and durability of cement mortar

2019 ◽  
Vol 9 (9) ◽  
pp. 1049-1054
Author(s):  
Yunxia Lun ◽  
Fangfang Zheng
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Fly Ash ◽  
Silica Fume ◽  
Cement Mortar ◽  
Steel Slag ◽  
Mineral Admixtures ◽  
Partial Replacement ◽  
Slag Powder ◽  
Steel Slag Powder

This study is aimed at exploring the effect of steel slag powder (SSP), fly ash (FA), and silica fume (SF) on the mechanical properties and durability of cement mortar. SSP, SF, and FA were used as partial replacement of the Ordinary Portland cement (OPC). It was showed that the compressive and bending strength of steel slag powder were slightly lower than that of OPC. An increase in the SSP content caused a decrease in strength. However, the growth rate of compressive strength of SSP2 (20% replacement by the weight of OPC) at the curing ages of 90 days was about 8% higher than that of OPC, and the durability of SSP2 was better than that of OPC. The combination of mineral admixtures improved the later strength, water impermeability, and sulfate resistance compared with OPC and SSP2. The compressive strength of SSPFA (SSP and SF) at 90 days reached 70.3 MPa. The results of X-ray diffraction patterns and scanning electron microscopy indicated that SSP played a synergistic role with FA or SF to improve the performance of cement mortar.

Research on the Volume Stability of Ternary Cementitious Systems Incorporating Fly Ash and Slag Powder

2009 ◽  
Vol 405-406 ◽  
pp. 256-261
Author(s):  
Hua Quan Yang ◽  
Shi Hua Zhou ◽  
Yun Dong
Keyword(s):  
Fly Ash ◽  
Ternary System ◽  
Cementitious Materials ◽  
Volume Shrinkage ◽  
Mineral Admixtures ◽  
High Quality ◽  
Volume Stability ◽  
Slag Powder ◽  
Cementitious Systems

The paper investigates the volume shrinkage of different cementitious materials. The results indicates the type and fineness of cement have significant effect on the volume stability of hardened paste, namely, the concrete with higher fineness cement has worse volume stability. The addition of mineral admixtures makes the volume stability of cementitious materials become complex. The mineral admixtures of high quality can reduce the shrinkage of hardened paste, and the duality system of cement incorporating fly ash have better volume stability than the ternary system of cement incorporating fly ash and slag powder.

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