Microstructure and Mechanism of Concrete Using Inorganic Silicate Admixture

Abstract:

The study evaluates the properties of concrete mixed with inorganic silicate admixture. The admixture was used in proportions of 3%, 5%, and 7% of the weight of the cement. We performed tests on compressive strength and elastic modulus to evaluate the mechanical properties of concrete. Results show that the addition of the inorganic silicate admixture has a positive influence on the mechanical properties of concrete, with the best results obtained with 3% admixture. MIP porosity measurements determined that the addition of inorganic silicate admixture increased the density of the porous structure. SEM microscopic analysis revealed many needle-like protrusions into the porous structure of concrete. XRF chemical composition analysis indicated that these structures comprised mainly Na2O and SiO2. Can with cement hydration products Ca(OH)2 bring in Chemical reaction. Inferred pore structure Within be C-S-H gel of needle-like protruding structure. it can improve the main cause of mechanical properties of concrete.

• Periodical: Applied Mechanics and Materials (Volumes 284-287)
• Pages: 1235-1241
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.284-287.1235
• Online since: January 2013
• Authors: Si Yu Zou, Ran Huang, An Cheng, Wei Ting Lin, Jia Liang Chang
• Keywords: C-S-H Gel, Inorganic Admixture, Silicate, XRF

References

[1] Zhang MH, Gjorv OE. Effect of silica fume on pore structure and chloride diffusivity of low porosity cement pastes. Cement Concrete Res(1991); 21(6): 1006–14.

DOI: 10.1016/0008-8846(91)90060-u

[2] Mindess S, Young JF, Darwin D. Concrete. Prentice Hall; (2003), p.477–504.

[3] Male RLA. Pore structure and permeability of cementitious materials. Mater Res Soc Symp Proc (1988), 137: 403–10.

[4] P. Ballester , A. Hidalgo , I. Mármol , J. Morales , L. Sánchez. Effect of brief heat-curing on microstructure and mechanical properties in fresh cement based mortars. Cement and Concrete Research 39 (2009) 573–579.

DOI: 10.1016/j.cemconres.2009.04.002

[5] B. Lothenbach, F. Winnefeld, C. Alder, E. Wieland, P. Lunk, Effect of temperature on the pore solution, miscrostructure and hydration products of Portland cement pastes, Cem. Concr. Res. 37 (2007) 483–491.

DOI: 10.1016/j.cemconres.2006.11.016

[6] M. Brandt, Cement-based Composites Materials, Mechanical Properties and Performance, E & FN SPON, (1995), pp.116-118.

[7] Garboczi, E. J., Permeability, Diffusivity and Microstructural Parameters: A Critical Review, Cement and Concrete Research, Vol. 20, No. 5, (1990), pp.591-601.

DOI: 10.1016/0008-8846(90)90101-3

[8] Halit Yazıcı. The effect of curing conditions on compressive strength of ultra high strength concrete with high volume mineral admixtures, Building and Environment 42 (2007) 2083–(2089).

DOI: 10.1016/j.buildenv.2006.03.013

[9] Richard P, Cheyrez M. Composition of reactive powder concretes. Cement and Concrete Research (1995), 25(7): 1501–11.

DOI: 10.1016/0008-8846(95)00144-2

[10] Long G, Wang X, Xie Y. Very high-performance concrete with ultrafine powders. Cement and Concrete Research (2002); 32: 601–5.

DOI: 10.1016/s0008-8846(01)00732-3

[11] Aitcin PC. The durability characteristics of high performance concrete: a review. Cement and Concrete Composites (2003), 25: 409–20.

DOI: 10.1016/s0958-9465(02)00081-1

[12] Kronlof, A. Effect of very fine aggregate on concrete strength. Materials and Structures (1994); 27: 185–94.

[13] J.J. Brooks , M.A. Megat Johari, M. Mazloom. Effect of admixtures on the setting times of high-strength concrete. Cement & Concrete Composites 22 (2000), 293-301.

DOI: 10.1016/s0958-9465(00)00025-1

[14] Han Young Moon, Dong Gu Shin, Doo Sun Choi. Evaluation of the durability of mortar and concrete appliedwith inorganic coating material and surface treatment system. Construction and Building Materials 21 (2007), 362–369.

DOI: 10.1016/j.conbuildmat.2005.08.012

[15] Knut O. Kjellsen a, Harald Justnes, Revisiting the microstructure of hydrated tricalcium silicate-a comparison to Portland cement, Cement & Concrete Composites 26 (2004) 947–956.

DOI: 10.1016/j.cemconcomp.2004.02.030

[16] Rikard Ylmén, Ulf Jäglid, Britt-Marie Steenari, Early hydration and setting of Portland cement monitored by IR, SEM and Vicat techniques Itai Panas, Cement and Concrete Research, Cement and Concrete Research 39 (2009) 433–439.

DOI: 10.1016/j.cemconres.2009.01.017

[17] Adapted from Sidney Edition,J. Francis Young, David Darwin，Concrete-2nd，Prentice Hall, Section 3. 2, (2002), 22-23.

[18] LaRosa, J. Thompson, Characterization of Silicate Sealers on Concrete, Cement and Concrete Research, Vol. 27, No. 10, (1997) , pp.1561-1567.

DOI: 10.1016/s0008-8846(97)00167-1