Effect of sand content on strength and pore structure of cement mortar

Abstract

The effects of four sand contents on the compressive, flexural and splitting-tensile strength of cement mortars were evaluated. Moreover, we experimentally investigated the pore structure of cement mortar brought about by changing the sand content and water/cement ratio. The changes in the pore structure were quantified by measuring the porosity and pore size distribution obtained by using mercury intrusion porosimetry (MIP) technique. The test results show that the strengths of cement mortar increase with increasing sand content. It is also suggested that the traditional water/cement ratio law can be applied to cement mortar with different sand contents, provided that a slight modification is introduced. Sand content is an important parameter influencing the pore structure of cement mortar. Moreover, there is a good relationship between the pore structure and strength of cement mortar.

Keywords

sand content / strength / cement mortar / pore structure

References

[1] Hedegaard SE, Hansen TC. Modified Water/Cement Ratio Law for Compressive Strength of Fly Ash Concrete[J]. Mater. Struct., 1992, 25(5): 273-283.

[2] Rao GA. Generalization of Abram’s Law for Cement Mortars[J]. Cem. Conc. Res., 2001, 31(3): 495-502.

[3] Alexander AG, Milne TI. Influence of Cement Blend and Aggregate Type on Stress-strain Behavior and Elastic Modulus of Concrete[J]. ACI Mater. J., 1995, 92(3): 227-235.

[4] Yang CC, Su JK. Approximate Migration Coefficient of Interfacial Transition Zone and the Effect of Aggregate Content on the Migration Coefficient of Mortar[J]. Cem. Conc. Research, 2002, 32(10): 1559-1565.

[5] Sideris KK, Manita P, Sideris K. Estimation of Ultimate Modulus of Elasticity and Poisson Ratio of Normal Concrete[J]. Cem. Conc. Res., 2004, 26(6): 623-631.

[6] Walker S, Bloem DL. Effect of Aggregate Size on Properties of Concrete[J]. ACI J., 1960, 57(9): 283-298.

[7] Zhou FP, Lydon FD, Barr BIG. Effect of Coarse Aggregate on Elastic Modulus and Compressive Strength of High Performance Concrete[J]. Cem. Conc. Res., 1995, 25(1): 177-186.

[8] Babu DS, Badu KG, Tiong-Huang W. Effect of Aggregate Size on Strength and Moisture Migration Characteristics of Lightweight Concrete[J]. Cement & Concrete Composites, 2006, 28(6): 520-527.

[9] Goble CF, Cohen MD. Influence of Aggregate Surface Area on Mechanical Properties of Mortar[J]. ACI Mater. J., 1992, 96(6): 657-662.

[10] Beshr H, Almusallam AA, Maslehuddin M. Effect of Coarse Aggregate Quality on the Mechanical Properties of High Strength Concrete[J]. Constr. Build. Mater., 2003, 17(2): 97-103.

[11] Stock AF, Hannant DJ, Williams RIT. The Effect of Aggregate Concentration Upon the Strength and Modulus of Elastic of Concrete [J]. Mag. Conc. Res., 1979, 31(109): 225-234.

[12] De Larrard F, Belloc A. The influence of Aggregate on the Compressive Strength of Normal-and High-strength Concrete[J]. ACI Mater. J., 1997, 94(5): 417-425.

[13] Giaccio G, Rocco C, Violini D, et al. High-strength Concrete Incorporating Different Coarse Aggregates[J]. ACI Mater. J., 2003, 89(3): 242-246.

[14] Strange PC, Bryant AH. The Role of Aggregate in the Fracture of Concrete[J]. J. Mater. Sci., 1979, 14(8): 1863-1868.

[15] Kaplan MF. Flexural and Compressive Strength of Concrete as Affected by the Properties of Coarse Aggregate. ACI Journal, 1959, 55: 1193-1208.

[16] Swamy N, Rigby G. Dynamic Properties of Hardened Paste, Mortar and Concrete[J]. Mater. Struct., 1971, 4(1): 13-40.

[17] Yang CC, Huang R. Approximate Strength of Lightweight Aggregate Using Micromechanics Method[J]. Advan. Cem. Based Mater., 1998, 7(3): 133-138.

[18] Giaccio G, Zerbino R. Failure Mechanisms of Concrete: Combined Effects of Coarse Aggregate and Strength Level[J]. Advan. Cem. Based Mater., 1998, 7(2): 41-48.

[19] Fu TC, Yeih W, Chang JJ. The Influence of Aggregate Size and Binder Material on the Properties of Pervious Concrete[J]. Advan. Mater. Sci. Eng., 2014 1-17.

[20] Perry C, Gillott JE. The Influence of Mortar-aggregate Bond Strength on the Behavior of Concrete in Uniaxial Compression[J]. Cem. Conc. Res., 1977, 7(5): 553-564.

[21] Chen HJ, Yen T, Lia TP, et al. Determination of the Dividing Strength and Its Relation to the Concrete Strength in Lightweight Aggregate Concrete[J]. Cem. Conc. Compos., 1999, 21(1): 29-37.

[22] Chi JM, Huang R, Yang CC, et al. Effect of Aggregate properties on the Strength and Stiffness of Lightweight Concrete[J]. Cem. Conc. Compos., 2003, 25(2): 197-205.

[23] Patil SG, Bhattacharjee B. Size and Volume Relationship of Pore for Construction Materials[J]. J. Mater. Civ. Eng., 2008, 20(6): 410-418.

[24] Lian C, Zhuge Y, Beecham S. The relationship Between Porosity and Strength for Porous Concrete[J]. Constr. Build. Mater., 2011, 25(11): 4294-4298.

[25] Galle C. Effect of Drying on Cement-based Materials Pore Structure as Identified by Mercury Intrusion Porosimetry, A Comparative Study between Oven-, Vacuum-, and Freeze-drying[J]. Cem. Conc. Res., 2001, 31(10): 1467-1477.

[26] Poon CS, Lam L, Wong YL. Effects of Fly Ash and Silica Fume on Interfacial Porosity of Concrete[J]. J. Mater. Civ. Eng., 1999, 11(3): 197-205.

[27] Tislova R, Kozlowska A, Kozlowski R, et al. Porosity and Specific Surface Area of Roman Cement Pastes[J]. Cem. Conc. Res., 2009, 39: 950-956.

[28] Bentur A. The Pore Structure of Hydrated Cementitious Compounds of Different Chemical Composition[J]. J. Amer. Ceram. Soc., 1980, 63(7–8): 381-386.

[29] Cook RA, Hover KC. Mercury Porosimetry of Hardened Cement Pastes[J]. Cement & Concrete Research, 1999, 29: 933-943.

[30] Olson RA, Neubauer CM, Jennings HM. Damage to the Pore Structure of Hardened Portland Cement Paste by Mercury Intrusion[J]. J. Amer. Ceram. Soc.y, 1997, 80(9): 2454-2458.

[31] Adolphs J, Setzer MJ, Heine P. Changes in Pore Structure and Mercury Contact Angle of Hardened Cement Paste Depending on Relative Humidity[J]. Mater. Struct., 2002, 35(8): 477-486.

[32] Alford NM, Rahman AA. An Assessment of Porosity and Pore Size in Hardened Cement Pastes[J]. J. Mater. Sci., 1981, 16(11): 3105-3114.

[33] Moro F, Bohni H. Ink-bottle Effect in Mercury Intrusion Porosimetry of Cement-based Materials[J]. J. Colloid Interface Sci., 2002, 246(1): 135-149.

[34] Zeng Q, Li K, Fen-chong T, et al. Pore Structure Characterization of Cement Pastes Blended with High-volume Fly-ash[J]. Cem. Conc. Res., 2012, 42(1): 194-204.

[35] Zampini D, Jennings HM, Shah SP. Characterization of the Paste-Aggregate Interfacial Zone to the Fracture Toughness of Concrete[J]. J. Mater. Sci., 1995, 30(12): 3149-3154.

[36] Neville AM. Aggregate Bond and Modulus of Elasticity of Concrete[J]. ACI Mater. J., 1997, 94(1): 71-74.

[37] Amparano FE, Xi Y, Roh YS. Experimental study on the Effect of Aggregate Content on Fracture Behavior of Concrete[J]. Eng. Fract. Mech., 2000, 67: 65-84.

[38] Cordon WA, Gillespie HA. Variables in Concrete Aggregates and Portland Cement Paste which Influence the Strength of Concrete[J]. ACI J., 1963, 60(8): 1029-1052.

[39] Wu S, Chen X, Zhou J. Influence of Strain Rate and Water Content on Mechanical Behavior of Dam Concrete[J]. Constr. Build. Mater., 2012, 36(4): 448-457.

[40] Atis CD. Carbonation-porosity-strength Model for Fly Ash Concrete[J]. J. Mater. Civ. Eng., 2004, 16(1): 91-94.

[41] Akkaya Y, Peled Y, Picka JD, et al. Effect of Sand Addition on Properties of Fiber-reinforced Cement Composites[J]. ACI Mater. J., 2000, 97(3): 393-400.

[42] Grassl P, Wong HS, Buenfeld NR. Influence of Aggregate Size and Volume Fraction on Shrinkage Induced Micro-cracking[J]. Cem. Concr. Res., 2010, 40(1): 85-93.

[43] Pope AW, Jennings HM. The Influence of Mixing on the Microstructure of the Cement Paste/Aggregate Interfacial Zone and on the Strength of Mortar[J]. J. Mater. Sci., 1992, 27(23): 6452-6462.

[44] Shane JD, Mason TO, Jennings HM. Effect of the Interfacial Transition Zone on the Conductivity of Portland Cement Mortars[J]. J. Amer. Ceram. Soc., 2000, 83(5): 1137-1144.

[45] Spanoudakis J, Young RJ. Crack Propagation in a Glass Particle-filled Epoxy Resin. Part I: Effect of Particle Volume Fraction and Size[J]. J. Mater. Sci., 1984, 19: 473-486.

[46] Langley KR, Martin A, Ogin SL. The Effect of Filler Volume Fraction on the Fracture Toughness of a Model Food Composite[J]. Compos. Sci. Tech., 1994, 50(2): 259-264.

[47] Odler I, Robler M. Investigation on the Relationship between Porosity, Structure and Strength of Hydrated Portland Cement Paste, (II) Effect of Pore Structure and of Degree of Hydration[J]. Cem. Conc. Res., 1985, 15(3): 401-410.

[48] Balshin MY. Relation of Mechanical Properties of Powder Metals and Their Porosity and the Ultimate Properties of Porous-metal Ceramic Materials[J]. Canad. J. Civ. Eng., 1949, 67(5): 831-834.

[49] Kumar R, Bhattacharjee B. Porosity, Pore Size Distribution, and in situ Strength of Concrete[J]. Cem. Conc. Res., 2003, 33(1): 155-164.