Ultra high early strength self-compacting mortar based on sulfoaluminate cement and silica fume

Abstract

The influences of silica fume and aluminum sulfate on hydration process of sulfoaluminate cement were carried out by ring flow, setting time, hydration heat, XRD and DTG analyses. In addition, mortar mixtures with different functional additives have been studied through compressive strength, flexural strength, volume stability at early age and porosity characterization tests. The results show that the addition of silica fume and aluminum sulfate reduces the fluidity and shortens the setting time of sulfoaluminate cement paste, promoting hydration process and increasing hydration products at early age. In the case of appropriate proportion of mortar, the inclusion of hydroxy propyl methyl cellulose, dispersible polypropylene fiber and organic silicon kind of defoamer can control segregation and bleeding, improve mechanical strength and volume stability at early age, and modify the pore distribution of sulfoaluminate cement mortar, respectively. The sulfoaluminate cement mortar can carry out gravitational grouting in the absence of outside force, the compressive strength of 2 hours and 24 hours have reached 26 and 58 MPa respectively, and have good microexpansion and tiny pore distribution characterization.

Keywords

sulfoaluminate cement / ultra high early strength / functional additives / volume stability / pore distribution

References

[1] Sho K H, Park S J, Kim Y J, . Utilization of Separator Bag Filter Dust for High Early Strength Cement Production[J]. Constr. Build. Mater., 2011, 25: 2 318-2 322.

[2] Zha Y, Sheng X, He K Research on the Cementitious System of Super-early Strength Bearing Mortar[J]. J. China Concrete, 2010, 8: 118-121.

[3] Zhang Y, Yang F Research and Application on Self-leveling Mortar in the Construction of High-speed Railway[J]. J. China Railway Engineering, 2011, 4: 24-26.

[4] Dong H Application on Epoxy Resin Mortar in Fixing Bridge Bearing[J]. J. China Highway, 2008, 4: 94-98.

[5] Jo Y K Basic Properties of Epoxy Cement Mortars without Hardener after Outdoor Exposure[J]. Constr. Build. Mater., 2008, 22: 911-920.

[6] Saccani A, Magnaghi V Durability of Epoxy Resin-based Materials for the Repair of Damaged Cementitious Composites[J]. Cem. Concr. Res., 1999, 29: 95-98.

[7] Berger S, Coumes C C D, Le Bescop P Influence of a Thermal Cycle at Early Age on the Hydration of Calcium Sulphoaluminate Cements with Variable Gypsum Contents[J]. Cem. Concr. Res., 2011, 41: 149-160.

[8] Korpa A, Kowald T, Trettin R Hydration Behaviour, Structure and Morphology of Hydration Phases in Advanced Cement-based Systems Containing Micro and Nanoscale Pozzolanic Additives[J]. Cem. Concr. Res., 2008, 38: 955-962.

[9] Dawood E T, Ramli M High Strength Characteristics of Cement Mortar Reinforced with Hybrid Fibres[J]. Constr. Build. Mater., 2011, 25: 2 240-2 247.

[10] Sobolev K, Arikan M High Volume Mineral Additive ECO-cement[J]. Am.Ceram.Soc.Bull., 2002, 81: 39-43.

[11] Sobolev K, Yeginobali A The Development of High-strength Mortars with Improved Thermal and Acid Resistance[J]. Cem. Concr. Res., 2005, 35: 578-583.

[12] Gartner E Industrially Interesting Approaches to “Low-CO₂” Cements[J]. Cem. Concr. Res., 2004, 34: 1 489-1 498.

[13] Sharp J H, Lawrence C D, Yang R Calcium Sulphoaluminate Cements-low Energy Cements, Special Cements or What[J]. Adv. Cem. Res., 1999, 11: 3-13.

[14] Popescu C D, Muntean M, Sharp J H Industrial Trial Production of Low Energy Belite Cement[J]. Cem. Concr. Comp., 2003, 25: 689-693.

[15] Mehta P K Investigation on Energy-saving Cements[J]. World. Cem. Technol., 1980, 5: 166-172.

[16] Fua X, Yang C, Liu Z, . Studies on Effects of Activators on Properties and Mechanism of Hydration of Sulphoaluminate Cement[J]. Cem. Concr. Res., 2003, 33: 317-324.

[17] Neville A M Properties of Concrete[C]. 4th.ELBS and Longman, Malaysia, 1996

[18] Bayasi Z, Zhou J Properties of Silica Fume Concrete and Mortar[J]. ACI. Mater. J., 1993, 90(4): 349-356.

[19] Yajun J, Cahyadi J H Effects of Densified Silica Fume on Microstructure and Compressive Strength of Blended Cement Pastes[J]. Cem. Concr. Res., 2003, 33: 1 543-1 548.

[20] Diamond S, Sahu S, Thaulow N Reaction Products of Densified Silica Fume Agglomerates in Concrete[J]. Cem. Concr. Res., 2004, 34: 1 625-1 632.

[21] L W Applications of an Eight-channel Isothermal Conduction Calorimeter for Cement Hydration Studies[J]. Cem. Int., 2005, 5: 94-101.

[22] Felekoğ B, Selc l, Türkel u, . Effects of Steel Fiber Reinforcement on Surface Wear Resistance of Self-compacting Repair Mortars[J]. Cem. Concr. Comp., 2007, 29: 391-396.

[23] Lura P, Durand F, Jensen O M Autogenous Strain of Cement Pastes with Super Absorbent Polymers[S]. Proceedings of International RIELM Conference on Volume Changes of Hardening Concrete: Testing and Mitigation, Denmark, 2006

[24] Rizwan S A, Bier T A Blends of Limestone Powder and Fly-ash Enhance the Response of Self-compacting Mortars[J]. Constr. Build. Mater., 2012, 37: 398-403.

[25] Pelletier-Chaignat L, Winnefeld F, Lothenbach B, . Influence of the Calcium Sulphate Source on the Hydration Mechanism of Portland Cement-calcium Sulphoaluminate Clinker-calcium Sulphate Binders[J]. Cem. Concr. Comp., 2011, 33: 551-561.

[26] Rodger S A, Double D D The Chemistry of Hydration of High Alumina Cement in the Presence of Accelerating and Retarding Admixtures[J]. Cem. Concr. Res., 1984, 14(1): 73-82.

[27] Larbi J A, Fraay A L A, Bijen J M J M The Chemistry of the Pore Fluid of Silica Fume-blended Cement Systems[J]. Cem. Concr. Res., 1990, 20(4): 506-516.

[28] Dawood E T, Rmli M High Strength Characteristics of Cement Mortar Reinforced with Hybrid Fibres[J]. Constr. Build. Mater., 2011, 25: 2 240-2 247.

[29] Langana B W, Wengb K, Warda M A Effect of Silica Fume and Fly Ash on Heat of Hydration of Portland Cement[J]. Cem. Concr. Res., 2002, 32: 1 045-1 451.

[30] Li J, Zhang H, Wang S The Effect of Gypsum in Sulphoaluminate Cement[J]. J. Harbin Archit. & Civ. Eng. Inst., 1994, 27(1): 57-61.

[31] Patural L, Marchal P, Govin A Cellulose Ethers Influence on Water Retention and Consistency in Cement-based Mortars[J]. Cem. Concr. Res., 2011, 41: 46-55.

[32] Khayat K H Viscosity-enhancing Admixtures for Cement-based Materials-an Overview[J]. Cem. Concr. Comp., 1998, 20: 2-13.