Effects of an AMPS-modified polyacrylic acid superplasticizer on the performance of cement-based materials

Abstract

A self-made AMPS-modified polyacrylic acid superplasticizer and two others of the same type but with different molecular structures, which are commercially available, are used in this study to investigate the effect of a 2-acrylamide-2-methyl propylene sulfonic (AMPS)-modified polyacrylic acid superplasticizer on the properties of cement-based materials. In the experiments, initial fluidity, 1 and 2 h fluidity over time after admixtion, bleeding rate of the net cement mortar, and adsorption capacity and rate of cement particles are determined by adding different dosages of the three superplasticizers into the cement paste to characterize the dispersivity and the dispersion retention capability of each superplasticizer. Water-reducing rates of three kinds of mortars are simultaneously determined to characterize the water-reducing capacity of each superplasticizer, as well as the 3 and 28 d compressive strengths to characterize the compression resistance. Results show that water-reducing effect and fluidity better maintain the capability of the AMPS-modified polyacrylic acid superplasticizer than the two commercially available polyacrylic acid superplasticizers, and the compressive strengths after 3 and 28 d show significant growth. In conclusion, the effects of water reduction and strengthening of the AMPS-modified polyacrylic acid superplasticizer are evidently better than those of the two commercially available polyacrylic acid superplasticizers.

Keywords

AMPS-modified polyacrylic acid superplasticizer / cement-based materials / polyacrylic acid superplasticizer / performance

References

[1] Xu Z N, Xiao G M, Zhou J N Kinetics of Carboxylic Acid Terpolymer High Performance Water-reducing Agent[J]. Polym. Mater. Sci. Eng., 2010, 26(1): 26-28.

[2] Palacios M, Puertas F, Bowen P, . Effect of PCs Superplasticizers on the Rheological Properties and Hydration Process of Slag-blended Cement Slurrys[J]. J. Mater. Sci., 2009 2 714-2 723.

[3] Yoshioka K, Tazawa E, Kawai K, . Adsoprtion Characteristics of Superplasticizers on Cement Component Minerals[J]. Cem. Concr. Compos., 2002 1 507-1 513.

[4] Papayianni I, Tsohos G, Oikonomou N, . Influence of Superplasticizer Type and Mix Design Parameters on the Performance of Them in Concrete Mixtures[J]. Cem. Concr. Compos., 2005 217-222.

[5] Li C Z, Feng N Q, Li Y D, . Effects of Polyethlene Oxide Chains on the Performance of Polycarboxylate-type Water-reducers[J]. Cem. Concr. Res., 2005 867-873.

[6] Li S, Wen Z Y Dispersibility and Airentraining Performance of Polycarboxylate-type Water Reducers[J]. J.Chin. Ceram. Soc., 2009, 37(4): 616-621.

[7] Bharatkumar B, Narayananm R, Raghuprasad B, . Mix Proportioning of High Performance Concrete[J]. Cen. Concr. Compos., 2001, 23(1): 71-89.

[8] Hassan E, Cabrera G, Maliehe S The Effect of Mineral Admixtures on the Properties of High-performance Concrete[J]. Cem. Concr. Compos., 2000, 22(4): 267-271.

[9] Zain M, Safiuddin M D, Mahmud H Development of High Performance Concrete Using Silica Fune at Relatively High Water-binder Ratios[J]. Cem. Concr. Res., 2000, 30(9): 1 501-1 505.

[10] Hou W M, Chang P K, Huang C L A Study on Anticorrosion Effect in High-performance Concrete by the Pozzolanic Reaction of Slag[J]. Cem. Concr. Res., 2004, 34(4): 615-622.

[11] Chen B F Synthesis of a Macromer, MPEGAA, Used to Prepare an AMPS-Modified Polyacrylic Acid Superplasticizer[J]. J. Wuhan Univ. Technol-Mater. Sci. Ed., 2013, 28(6): 1 186-1 190.

[12] Chen B F Synthesis and Properties of an AMPS-Modified Polyacrylic Acid Superplasticizer[J]. J. Wuhan Univ. Technol-Mater. Sci. Ed., 2013, 28(3): 566-573.