Microstructure of High Strength Concrete Mercury Intrusion Porosimetry and Thermogravimetry Analysis

Mohammad, Iqbal Khan

doi:10.4028/www.scientific.net/AMR.243-249.3781

Paper Titles

Effect of Phenol on Treatment of Sewage from Channel Discharge with Biological Accelerator-Biofilm Process
p.3761

Dynamic Reliability-Based Seismic Optimal Design of Base-Isolated Structures
p.3765

Dynamic Reliability-Based Seismic Optimal Design of Structures with Tuned Mass Damper
p.3770

An Improved Contact Model for Pounding Simulation of Base-isolated Highway Bridge
p.3775

Microstructure of High Strength Concrete Mercury Intrusion Porosimetry and Thermogravimetry Analysis
p.3781

The Study of the Correlation between Ground Motion Input and Artificial Boundary Condition
p.3787

An Equivalent Far-Field Dynamic-Artificial-Boundary Condition and its Accuracy Studies
p.3795

Numerical Analysis for Oil Pipeline Subjected to Earthquake Liquefaction-Induced Lateral Spreading
p.3804

Displacement-Based Design for RC Bridge Columns Based on Chinese Code
p.3808

Home Advanced Materials Research Advances in Civil Engineering and ArchitectureMicrostructure of High Strength Concrete Mercury...

Microstructure of High Strength Concrete Mercury Intrusion Porosimetry and Thermogravimetry Analysis

Abstract:

Microstructural properties such as pore structure and hydration play a decisive role in determining the properties of a concrete. This paper presents the investigation on pore structure and hydration process of high strength concrete. Pore structure study was conducted using mercury intrusion porosimetry and hydration progress was monitored using thermogravimetry analysis on various blended combinations of cementitious materials incorporating fly ash and silica fume as partial cement replacement. It was found that silica fume refined the pore structure efficiently and reduced the calcium hydroxide content as early as 1 day. All ternary blended systems containing fly ash and silica fume exhibited lower calcium hydroxide content and refined pore structure in comparison to their respective blended pastes.

Info:

Periodical:

Advanced Materials Research (Volumes 243-249)

Main Theme:

Advances in Civil Engineering and Architecture

Edited by:

Chaohe Chen, Yong Huang and Guangfan Li

Pages:

3781-3786

DOI:

10.4028/www.scientific.net/AMR.243-249.3781

Citation:

I. K. Mohammad "Microstructure of High Strength Concrete Mercury Intrusion Porosimetry and Thermogravimetry Analysis", Advanced Materials Research, Vols. 243-249, pp. 3781-3786, 2011

Online since:

May 2011

Authors:

Iqbal Khan Mohammad

Keywords:

High-Strength Concrete (HSC), Hydration, Microstructure, Thermogravimetry Analysis

Export:

RIS, BibTeX

Price:

$38.00

Permissions:

Request Permissions

Add to Cart

References

[1] M.D. Cohen, and M. Klitsikas: Indian Concrete Journal, Vol. 60, No. 11, pp.296-300 (1986).

[2] V.M. Malhotra and P.K. Mehta: Pozzolanic and Cementitious Materials–Advances in Concrete Technology, Vol. I, Gordon and Breach, Netherlands (1996).

[3] M.I. Khan: Journal of Materials in Civil Engineering, ASCE, Vol. 15, pp.84-92 (2003).

[4] F.M. Lea: The Chemistry of Cement and Concrete, Edward Arnold, London (1970).

[5] J. Pavlík, V. Tydlitáta, R. ernýa, T. Kle kab, P. Bou kab and P. Rovnaníkovác: Cement and Concrete Research, USA, Vol. 33, No. 1, pp.93-102 (2003).

[6] P. Mounanga, A. Khelidj, A. Loukili and V. Baroghel-Bouny: Cement and Concrete Research, USA, Vol. 34, No. 2, pp.255-265 (2004).

DOI: 10.1016/j.cemconres.2003.07.006

[7] B. El-Jazairi, and J.M. Illston: Cement and Concrete Research, USA, Vol. 10, No. 3, pp.361-366 (1980).

[8] M.I. Khan, and C.J. Lynsdale: Cement and Concrete Research, USA, Vol. 32, No. 1, pp.123-131 (2002).

[9] R.F. Feldman and C. Huang: Cement and Concrete Research, USA, Vol. 15, No. 5, pp.765-774 (1985).

[10] R.D. Hooton: ACI Materials Journal, USA, Vol. 90, No. 2, pp.143-151 (1993).

[11] FIP Report: Condensed Silica Fume in Concrete, FIP state-of-art report, fip Commission of Concrete, Thomas Telford House, UK (1988).

DOI: 10.1016/0958-9465(90)90037-x

[12] Y. Li, B.W. Langan and M.A. Ward: Cement, Concrete and Aggregate, USA, Vol. 18, No. 2, pp.112-117 (1996).

[13] J.A. Larbi, A.L. A Fraay and J.M. Bijen: Cement and Concrete Research, USA, Vol. 20, No. 4, pp.506-516 (1990).

DOI: 10.1016/0008-8846(90)90095-f

Paper TitlePages

Carbonation Test Study on Low Calcium Fly Ash Concrete

Authors: Hui Xu, Zhan Qing Chen, Su Bei Li, Wei Huang, Dan Ma

Abstract: Making full use of fly ash (FA) is an important part of sustainable materials development in the word. This paper discussed the carbonation resistance of concrete with 10%, 20% and 25% fly ash replacement ratios(FA%). The process was accelerated in artificial carbonation laboratory by controlling 20% concentration of CO2, 10°C~30°C temperature and 50%~70% relative humidity(RH). The depth of carbonation could be observed by spraying phenolphthalein solution on the fresh broken concrete surface. The test results show that adding fly ash into concrete results in the decrease of cement consumption and calcium hydroxide, so carbonation rate increases. But with the increase of FA% and carbonization time, the drop speed of carbonation rate slower, the differences in the microstructure are detailed. In addition, the carbonation rate increases when the ambient temperature varies from 10°C to 30°C and ambient RH falls from 70% to 50%. It concludes that the 10°C ambient temperature and 70% ambient RH are superior to other environmental conditions for enhanceing concrete carbonation resistance, and mixing 10%~25% FA into concrete have little influence on carbonation resistance of concrete if have adequate curing time.

327

Mechanical Properties of Steam-Cured Concrete with Combined Mineral Admixtures

Authors: Zhi Min He, Jun Zhe Liu, Tian Hong Wang

Abstract: In precast concrete elements manufacturing, steam-cured concrete incorprating 30% mineral admixtures encountered the problem of too low demoulding compressive strength. To resolve it, this paper mainly studied the influence of mineral admixtures on the compressive strength, the tensile-splitting strength and the flexural strength of the steam-cured concrete. The experimental results indicated that, compared with steam-cured concrete incorprating mineral admixtures, the later strength of steam-cured concrete incorprating 0% mineral admixtures has lower increment degree and its increment of tensile-splitting strength and flexural strength inverted to some extent. The demoulding compressive strength is too low for the high volume fly ash concrete mixtures. The problem of too low demoulding compressive strength is solved by incorprating composites of ground blast furnace slag(GBFS) and fly ash. Different varieties of mineral admixture used in the concretes can produce a certain degree of potentiation.

1535

Study on the Effect of Fly Ash or Silica Fume to Hydration Heat of Cement

Authors: Li Guo Ma, Yun Sheng Zhang

Abstract: The hydration heat evolution process is studied on the pure cement paste, the cement- fly ash binary system and the cement- silica fume binary system with water binder ratio(w/b) of 0.53, 0.35 and 0.23 by using isothermal calorimeter(TAM Air). The fly ash replacement in the cement-fly ash binary system is 10%, 30% and 50% respectively. The silica fume replacement in cement-silica fume binary system is 4%, 8% and 12% respectively. The experiments results indicate that w/b had great impact on the hydration heat evolution and the hydration heat decrease with the decrease in w/b. The addition of fly ash greatly decrease the exothermic rate and total hydration heat. The addition of silica fume shortens dormant period and increases the peak exothermic rate, but reduces the total hydration heat.

4001

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

Study on Carbonation Resistance of High-Performance Concrete with Large Amount of Fly Ash

Authors: Xue Song Zhang

Abstract: Based on the mechanism of concrete carbonation, the effects of content of fly ash in the binder, the water to binder ratios, compound activator, and long-term curing on the carbonation depth of fly ash high-performance concrete are investigated. Experiment results are analyzed and compared with compressive strength development characteristic of fly ash high-performance concrete, and some valuable conclusions are gained.

1688