Research on Some Properties of Fly Ash Concrete with Nano-CaCO3 Middle Slurry

Qian, Kuang Liang; Meng, Tao; Qian, Xiao Qian; Zhan, Shu Lin

doi:10.4028/www.scientific.net/KEM.405-406.186

Paper Titles

Effect of Adding Electrolyte in Cement Paste on the Dispersing Force of Polycarboxylate-Type Superplasticizer
p.160

Influence of Superplasticizer and Shrinkage-Reducing Admixtures on Early Age Shrinkage of Concrete
p.166

Performance of a Slow-Release Type Carboxylic Polymer and its Application
p.174

Characteristics of Zeolite Plasticizer
p.183

Research on Some Properties of Fly Ash Concrete with Nano-CaCO₃ Middle Slurry
p.186

Research on Performance of Cement with Kiln Dust-Activated Coal Gangue
p.191

Influence of Lightweight Aggregate on Durability of High Performance Concrete
p.197

C60 High Performance Concrete Prepared from Manufactured Sand with a High Content of Microfines
p.204

Internal Curing of Saturated Lightweight Aggregate in High Performance Combined Concrete
p.212

Home Key Engineering Materials Ultra-High-Pumpability and High Performance...Research on Some Properties of Fly Ash Concrete...

Research on Some Properties of Fly Ash Concrete with Nano-CaCO₃ Middle Slurry

Abstract:

Some long-term properties such as anti-carbonation properties, shrinkage, penetrability of chloride ion of fly ash concrete with nano-CaCO3 middle slurry were studied. Test results showed that the properties of anti-carbonation and impenetrability for chloride of fly ash concrete increased by adding nano-CaCO3 middle slurry because the tiny hole was filled by nano-CaCO3 and the density of concrete increased. But at the same time, the shrinkage of fly ash concrete with and without nano-CaCO3 was the same. Results of SEM also implied the hydration degree of fly ash could be increased by nano-CaCO3.

Info:

Periodical:

Key Engineering Materials (Volumes 405-406)

Main Theme:

Ultra-High-Pumpability and High Performance Concrete Technology

Edited by:

Hao-Wen YE and Gai-Fei PENG

Pages:

186-190

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.405-406.186

Citation:

K. L. Qian et al., "Research on Some Properties of Fly Ash Concrete with Nano-CaCO₃ Middle Slurry", Key Engineering Materials, Vols. 405-406, pp. 186-190, 2009

Online since:

January 2009

Authors:

Kuang Liang Qian, Tao Meng, Xiao Qian Qian, Shu Lin Zhan

Keywords:

Fly Ash (FA), Long-Term Properties, Middle Slurry, Nano-CaCO₃

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Price:

$38.00

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References

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Paper TitlePages

Influence of Mineral Admixtures on the Carbonation Resistance and Chloride Permeability of Steam-Cured HPC

Authors: Jian Hua Wu, Yun Lan Liu

Abstract: This paper studies the influence of different mineral admixtures（fly ash and ground granulated blast furnace slag）on the carbonation resistance and chloride permeability of steam-cured HPC. The test results show that under the condition of steam-cured and standard-cured, incorporating 20-30% of the ground granulated blast furnace slag or 15-20% of fly ash decreased the alkalinity and the carbonation resistance of the concrete; with the increase of the proportion of the mineral admixture in concrete, carbonation resistance of HPC was decreased; incorporating 20-30% of the ground granulated blast furnace slag or 15-20% of fly ash improved the chloride permeability of steam-cured concrete, and the influence of ground granulated blast furnace slag is better than that of the fly ash.

366

Experimental Research on the Properties of Modified MPC

Authors: Bing Chen, Xin Yuan Yang, Ning Liu

Abstract: Magnesium phosphate cement (MPC) was modified by fly ash, silica fume and re-dispersible latex powder and the properties of modified MPC, such as fluidity, setting time and compressive strength, were tested. Based on the experimental results, the contents of 50% fly ash, 10% silica fume and 2% re-dispersible latex powder were chosen to modify MPC and the water resistance of the modified MPC was studied. The experimental results showed that the addition of fly ash prolonged the setting time and significantly increased the compressive strength of MPC. The addition of silica fume improved only the water resistance of MPC. The addition of the re-dispersible latex powder prolonged the setting time and improved the water resistance of MPC.

796

Preparation and Mechanism of High Dosage Fly Ash Cement

Authors: Rui Gang Wang

Abstract: The activate effect of various activator on fly ash was studied according to the comparative tests of cement strength. The result shows that the sulfate activator and alcohol amine activator composite mixture has the best activate effect under the reasonable mix ratio. The composite mixture can obviously affect fly ash cement strength, and under the 50% mixing amount of fly ash, the 3d strength of cement is improved by 30% to 50%, and the 7d strength of cement is improved by 20% to 30%. Activate mechanism of the composite activator was studied through the XRD, SEM and other microscopic testing methods.

Study on the Change in Microstructure of Fly Ash Concrete Depending on Ages and Degree of Hydration Using XRD and SEM

Authors: Ho Jae Lee, Jang Hwa Lee, Do Gyeum Kim

Abstract: This research analyzes the microstructure of hardened blended cement pastes. Fly ash was used to replace Portland cement type I paste. Test results indicated that hardened blended cement paste were significantly affected by duration after mixing. The X-ray diffraction (XRD) and the scanning electron microscope (SEM) showed changes of microstructure by duration.

350

Effect of Different Mineral Admixtures on Properties of Sulphoaluminate Cement

Authors: Rui Ma, Xin Cheng, Chen Chen Gong, Shou De Wang, Ling Chao Lu

Abstract: Effects of superfine slag powder, fly ash and ultra-fine CaCO3 on compressive strength of sulphoaluminate cement were investigated. Cement hydration products were analyzed by using scanning electron microscopy (SEM). The results show that different fineness and additions of mineral admixture differ in compressive strength. When the amount of superfine slag powder, fly ash and ultra-fine CaCO3 are added by 10%, 10% and 3% (by weight), the compressive strength of the hardened paste of sulphoaluminate cement is highest, respectively. Meanwhile, it is concluded that the additions of superfine slag powder and ultra-fine CaCO3 facilitates hydration at early ages, while fly ash could accelerate hydration at later ages.

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