Influence of Superplasticizer Type and Dosage on Early-age Drying Shrinkage of Cement Paste with Consideration of Pore Size Distribution and Water Loss

Abstract

We introduced a parameter r _s (the radius of the pores where the meniscus forms), which is composed of two factors, i e, water loss and cumulative pore size distribution (PSD), to provide a better explanation of the influence of superplasticizers(SPs) on early-age drying shrinkage. In our experiments, it is found that the addition of three types of SPs leads to a significant increase in the early-age drying shrinkage of cement paste, and drying shrinkage increases with the dosage of SPs. Based on the results above, we further studied the mechanism of the effects of SPs on the early-age drying shrinkage of cement paste by PSD and water loss, which are two components of r _s. The experimental results indicate that r _s can be a better index for the early-age drying shrinkage of cement-based materials with SPs than a single factor. In addition, the effects of SPs on other factors such as hydration degree and elastic modulus were also investigated and discussed.

Keywords

superplasticizer / early-age drying shrinkage / water loss / pore size distribution

References

[1] Zhang YR, Kong XM. Correlations of the Dispersing Capability of NSF and PCE Types of Superplasticizer and Their Impacts on Cement Hydration with the Adsorption in Fresh Cement Pastes[J]. Cement Concrete Res., 2015, 69: 1-9.

[2] Boukendakdji O, Kadri EH, Kenai S. Effects of Granulated Blast Furnace Slag and Superplasticizer Type on the Fresh Properties and Compressive Strength of Self-compacting Concrete[J]. Cement Concrete Comp., 2012, 34(4): 583-590.

[3] Brooks JJ, Wainwright PJ. Properties of Ultra-high-strength Concrete Containing a Superplasticizer[J]. Mag Concrete Res., 1983, 35(125): 205-213.

[4] Li PP, Yu QL, Brouwers HJH. Effect of PCE-type Superplasticizer on Early-age Behaviour of Ultra-high Performance Concrete (UHPC)[J]. Constr Build Mater, 2017, 153: 740-750.

[5] Abusogi MA, Wei XW. Experimental and Numerical Analysis of Restrained Early Age Cracking based on Electrical Resistivity Using Eccentric Sample[J]. J. Wuhan Univ. Technol., 2018, 33(6): 1 472-1 480.

[6] Bentz DP, Geiker MR, Hansen KK. Shrinkage-reducing Admixtures and Early-age Desiccation in Cement Pastes and Mortars[J]. Cement Concrete Res., 2001, 31(7): 1 075-1 085.

[7] Holt E, Leivo M. Cracking Risks Associated with Early Age Shrinkage[J]. Cement Concrete Comp., 2004, 26(5): 521-530.

[8] Messan A, Ienny P, Nectoux D. Free and Restrained Early-age Shrinkage of Mortar: Influence of Glass Fiber, Cellulose Ether and EVA (ethylene-vinyl acetate)[J]. Cement Concrete Comp., 2011, 33(3): 402-410.

[9] Lura P, Van Breugel K, Maruyama I. Effect of Curing Temperature and Type of Cement on Early-age Shrinkage of High-performance Concrete[J]. Cement Concrete Res., 2001, 31(12): 1 867-1 872.

[10] Shen C. A Study on Early Shrinkage of Concrete and Cement Paste[D], 2012 Hangzhou: Zhejiang University. (in Chinese)

[11] Zhang LF. Study of Early-age Shrinkage of Cement-based Materials and Numerical Simulation[D], 2014 Hangzhou: Zhejiang University. (in Chinese)

[12] Chen H, Wyrzykowski M, Scrivener K, et al. Prediction of Self-desiccation in Low Water-to-cement Ratio Pastes based on Pore Structure Evolution[J]. Cement Concrete Res., 2013, 49: 38-47.

[13] Li Y, Bao JL, Guo YL. The Relationship between Autogenous Shrinkage and Pore Structure of Cement Paste with Mineral Admixtures[J]. Constr. Build Mater., 2010, 24(10): 1 855-1 860.

[14] Loukili A, Khelidj A, Richard P. Hydration Kinetics, Change of Relative Humidity, and Autogenous Shrinkage of Ultra-high-strength Concrete[J]. Cement Concrete Res., 1999, 29(4): 577-584.

[15] Wong SF, Wee TH, Swaddiwudhipong S, et al. Study of Water Movement in Concrete[J]. Mag. Concrete Res., 2001, 53(3): 205-220.

[16] Ba MF, Qian CX, Wang H. Effects of Specimen Shape and Size on Water Loss and Drying Shrinkage of Cement-based Materials[J]. J. Wuhan Univ. Technol., 2013, 28(4): 733-740.

[17] Aly T, Sanjayan JG. Effect of Pore-Size Distribution on Shrinkage of Concretes[J]. J. Mater. Civil Eng., 2010, 22(5): 525-532.

[18] Collins F, Sanjayan JG. Effect of Pore Size Distribution on Drying Shrinkage of Alkali-activated Slag Concrete[J]. Cement Concrete Res., 2000, 30(9): 1 401-1 406.

[19] Tazawa E, Miyazawa S. Influence of Cement and Admixture on Autogenous Shrinkage of Cement Paste[J]. Cement Concrete Res., 1995, 25(2): 281-287.

[20] Al-Amoudi OSB, Abiola TO, Maslehuddin M. Effect of Superplasticizer on Plastic Shrinkage of Plain and Silica Fume Cement Concretes[J]. Constr. Build Mater., 2006, 20(9): 642-647.

[21] Brooks JJ. Influence of Mix Proportions, Plasticizers and Superplasticizers on Creep and Drying Shrinkage of Concrete[J]. Mag. Concrete Res., 1989, 41(148): 145-153.

[22] Ma BA, Wang XG, Liang WQ, et al. Study on Early-age Cracking of Cement-based Materials with Superplasticizers[J]. Constr. Build Mater., 2007, 21(11): 2 017-2 022.

[23] Lai JY, Zhang LF, Qian XQ, et al. Influence of Superplasticizers on Early Age Drying Shrinkage of Cement Paste with the Same Consistency[J]. J. Wuhan Univ. Technol., 2014, 29(6): 1 201-1 207.

[24] Lea FM. The Chemistry of Cement and Concrete[M]. London 727, Edward Arnold, 1970

[25] Hua C, Acker P, Ehrlacher A. Analyses and Models of the Autogenous Shrinkage of Hardening Cement Paste.1. Modeling at Macroscopic Scale[J]. Cement Concrete Res., 1995, 25(7): 1 457-1 468.

[26] Vanbreugel K. Numerical-Simulation of Hydration and Microstructural Development in Hardening Cement-Based Materials.2. Applications[J]. Cement Concrete Res., 1995, 25(3): 522-530.

[27] Sakai E, Kasuga T, Sugiyama T, et al. Influence of Superplasticizers on the Hydration of Cement and the Pore Structure of Hardened Cement[J]. Cement Concrete Res., 2006, 36(11): 2 049-2 053.

[28] Almudaiheem JA. An Improved Model to Predict the Ultimate Drying Shrinkage of Concrete[J]. Mag. Concrete Res., 1992, 44(159): 81-85.

[29] P K M. Concrete: Microstructure, Properties, and Materials[M], 1993 2nd ed. New Jersey: Prentice Hall.

[30] Li Y, Li JQ. Capillary Tension Theory for Prediction of Early Autogenous Shrinkage of Self-consolidating Concrete[J]. Constr. Build Mater., 2014, 53: 511-516.

[31] Ma Y, Ye G. The Shrinkage of Alkali Activated Fly Ash[J]. Cement Concrete Res., 2015, 68: 75-82.

[32] Shimomura T, Maekawa K. Analysis of the Drying Shrinkage Behaviour of Concrete Using a Micromechanical Model based on the Micropore Structure of Concrete[J]. Mag. Concrete Res., 1997, 49(181): 303-322.