Effects of Plastering and Ferrocement on the Shear Properties of Masonry Triplets

  • Abdullah Al Hashib Ahsanullah University of Science and Technology, Tejgaon Industrial Area, Dhaka 1208, Bangladesh
  • Md Sayeed Faisal Ahsanullah University of Science and Technology, Tejgaon Industrial Area, Dhaka 1208, Bangladesh
  • Md. Aminur Rashid Ahsanullah University of Science and Technology, Tejgaon Industrial Area, Dhaka 1208, Bangladesh
  • Sayin Tamhid Ahsanullah University of Science and Technology, Tejgaon Industrial Area, Dhaka 1208, Bangladesh
Keywords: Triplet, Shear strength, Strain at maximum stress, Ferrocement.

Abstract

Masonry triplet is formed by three and half bricks keeping the same type of bond exhibited in a brick wall.  The triplet has been investigated by researchers as an indicator of lateral loading capacity of masonry wall.  Although strength is an important parameter in determining the property of triplet, displacement capacity is significant specially for the cases of lateral loads such as wind load or earthquake load.  Experimental investigations carried out to determine the effect of plastering and ferrocement in masonry triplets in terms of both shear strength and strain at maximum stress.  The study identified several parameters that affect these properties e.g. mortar strength, mortar thickness, compressive strength of brick, plastering layer thickness, diameter of the wire mesh, and amount of wire mesh.  Equations have been proposed to determine the shear strength and strain at maximum stress of the triplet based on these factors.  Bond strength was found to be the key factor for the failure of the triplets.  It can be inferred that the construction in Bangladesh lack the bond strength in the horizontal bed surface, decreasing both the load and displacement capacity of the brick wall.  Ferrocement can be used as a retrofitting technique as it has been found from the tests that laminating the triplet surface with ferrocement prevents sudden collapse and confines the triplet so that the shear strength and strain at maximum stress increase. 

References

G. Al-Chaar, M. Issa, and S. Sweeney. “Behavior of Masonry-Infilled Nonductile Reinforced Concrete Frames”. Journal of Structural Engineering, vol. 128, No. 8, pp. 1055-1063, Aug, 2002.

A.B. Mehrabi, P.B. Shing, M.P. Schuller, and J.L. Noland. “Experimental Evaluation of Masonry-Infilled RC Frames”. Journal of Structural Engineering, vol. 122, No. 3, pp. 228-237, Mar, 1996.

Concrete Society, “What is Ferrocement?”. Internet: http://www.concrete.org.uk/fingertips-nuggets.asp?cmd=display&id=526 [May 11, 2019]

ACI Concrete Terminology, American Concrete Institute. “Ferrocement.” Internet: https://www.concrete.org/topicsinconcrete/topicdetail/ferrocement, [May 11, 2019]

Clarke R.P., and Sharma A.K. “Hysteretic Behavior of Ferrocement-Retrofitted Clay Tile Walls.”, ACI Structural Journal, Vol. 101, No. 3, pp. 387-394, May-Jun, 2004.

A.M. Reinhorn, S.P. Prawel, and Z. Jia. “Experimental Study of Ferrocement as a Seismic Retrofit Material for Masonry Walls.” Journal of Ferrocement. Vol. 15, No. 13, ,pp. 247-260, Jul 1985.

P. Balaji, S.A. Selvan. “Performance Evaluation of Ferrocement Sandwich Wall Panels with Different Infills”. International Research Journal of Engineering and Technology, Volume 5, Issue 4, pp. 1518-1524, Apr 2018.

S.V. Venkatesh. “Strength characteristics of brick masonry wall before and after encasing with ferrocement.” in 8th International Masonry Conference, Dresden, Jul, 2010, pp 1-8.

G.M. Calvi, D. Bolognini, and A. Penna. “Seismic Performance of Masonry-Infilled R.C. Frames: Benefits of Slight Reinforcements.” Seismic 2004 - 6th Portugese Congress of Seismology and Earthquake Engineering. Portugal, 2004, pp. 253-276.

Hi-Top Merchandising, inc. “Stainless Steel Wiremesh (Welded & Woven”. Internet: https://hitopmdsg.com/products/wire-mesh-welded-woven/, [ May 11, 2019].

A. Rahman, T. Ueda. “Experimental Investigation and Numerical Modeling of Peak Shear Stress of Brick Masonry Mortar Joint under Compression”. Journal of Materials in Civil Engineering. vol. 26, pp. 1-13, Oct, 2014.

G. Andreotti, F. Graziotti, and G. Magenes. “Detailed micro-modeling of the direct shear tests of brick masonry specimens: The role of dilatancy”. Engineering Structures, vol. 168, pp. 929-949, May, 2018.

S.B. Singh, and P. Munjal. “Bond strength and compressive stress-strain characteristics of brick masonry.” Journal of Building Engineering. vol. 9, pp. 10-16, Nov. 2016.

B. Istegun, E. Celebi. “Triplet Shear Tests on Retrofitted Brickwork Masonry Walls”. International Journal of Civil, Environmental, Strutural, Construction and Architectural Engineering, Vol. 11, No. 9, pp. 1250-1255, 2017.

K.M.C. Konthesingha, C. Jayasinghe, and S.M.A. Nanayakkara. “Bond and Compressive Strength of Masonry for Locally Available Bricks”. The Institution of Engineers, Sri Lanka. Vol. XXXX, No. 4, pp 7-13, 2007.

J. Milosevic, A.S. Gago, M. Lopes, R. Bento. “Experimental tests on rubble masonry specimens – diagonal compression, triplet and compression tests” in 15 world conference on earthquake engineering (15 WCEE), Lisbon, 2012

T. Nagarajan, S. Viswanathan, S. Ravi, V. Srinivas, P. Narayanan. “Experimental Approach to Investigate the Behaviour of Brick Masonry for Different Mortar Ratios” in International Conference on Advances in Engineering and Technology, Singapore, Mar, 2014, pp. 586-592.

ASTM C67 / C67M-18, “Standard Test Methods for Sampling and Testing Brick and Structural Clay Tile”, ASTM International, West Conshohocken, PA, 2015, www.astm.org.

“Specifications for and Classification of Brick”. Technical Notes on Brick Construction. Brick Industry Association, Reston, Virginia, 2007.

ASTM C62-17, “Standard Specification for Building Brick (Solid Masonry Units made from Clay and Shale)”, ASTM International, West Conshohocken, PA, 2017, www.astm.org

ACI 549.1R-18 (2018), “Design Guide for Ferrocement”. ACI Committee 549, American Concrete Institute.

ACI 549R-18 (2018). “Report on Ferrocement”. ACI Committee 549, American Concrete Institute.

“Technical Notes 39 – Testing for Engineered Brick Masonry- Brick and Mortar”. Technical Notes on Brick Construction. Brick Industry Association, Reston, Virginia, Nov, 2001.

ASTM C270-03b, 2003 (latest version: ASTM C270-19), “Standard Specification for Mortar for Unit Masonry”, ASTM International, West Conshohocken, PA, 2019, www.astm.org.

Published
2019-05-18
Section
Articles