You can read more about the various brick orientations in our brick sizes, shapes, and grades article. Pdf experimental investigation of rattrap bond masonry. Thus, the interiors remain cooler in summer and warmer in winter. Meghashree and 5 deals with the experimental satish identification of shear strength of brick masonry by 100%. Tensing 3 school of civil engineering, karunya university, coimbatore641114, tamil nadu, india abstract this paper presents the experimental investigations of small burnt clay brick masonry samples. Experimental investigation of rattrap bond masonry systems under base shock excitation. Preventing and treating distress in brick veneer cavity walls. Pedroso2 professor, department of civil engineering, center of technology, federal university of santa maria, research and development on structural masonry group. In header bond brick masonry all the bricks are set in the header courses. Introduction the manner in which bricks are arranged in a wall is obviously of great importance to the appearance and strength. The art of laying bricks in mortar in a proper systematic manner gives homogeneous mass which. The brick are laid radially in a cylinder of about 4 feet in diameter.
Pdf comparison of performance of rat trap brick bond. Rat trap bond is a kind of wall brick masonry bond in which bricks are sited on edge such that the shine r. For temporary sheds mud mortar may be used but for all permanent buildings lime or cement mortars are used. Although the investigation only tested a limited number of prisms, the results of these tests indicated that the initial rate of absorption ira of the brick units can have a greater influence on the flexural bond strength of the masonry assembly than is generally accepted by the masonry industry. In order to obtain uniform distribution of load, under the ends of girders, roof trusses etc. Feb 01, 2018 brick masonry brick masonry is built with bricks bonded together with mortar. This article references headers and stretchers, which are typical brick orientations. A type of bond in a brick masonry in which each course consists of alternate headers and stretchers, is called. Masonry material and product manufacturers organized by the product or the material into csi divisions. The bonds horizontally extended proportion suits long stretches of masonry such as. Ncma tek national concrete masonry association an information series from the national authority on concrete masonry technology concrete masonry bond patterns tek 146 structural 2004 keywords. The masonry arch is one of the oldest structural elements. Bonding stone masonry care must be taken that no vertical joint in any course comes over a joint in the course below, but the stones should break joints or overlap, preferably to an extent of from once to onceandahalf the height of the course, so that each stone will be supported by at least two stones of the course below, and will in turn. The national concrete masonry association is a registered provider.
Rat trap bond is a brick masonry method of wall construction, in which bricks are placed in vertical position instead of conventional horizontal position and. The cavities in the masonry act as thermal insulators. Rate analysis of brick masonry calculate quantity and cost. Types of bonds in brick masonry wall construction are classified based on the laying and bonding style of bricks in walls. Brick is a building unit,which is in the form of rectangular block in which length to breadth ratio is 2 but height can be different. A type of bond in a brick masonry consisting of alternate course of headers and stretchers, is called a. More complicated bonds, which usually necessitate more grinding work, can substantially raise the price. Flexural bond strength of masonry using various blocks and. This leads to reduced flexural bond strength and bondline separations that can adversely affect the masonrys ability to resist water penetration. Brick wall laid in rattrap bond photographed near angelsea road, wivenhoe, essex. Unreinforced masonry buildings and earthquakes 1 1 introduction this document provides guidance on how to develop programs to reduce the earthquake risks of existing unreinforced masonry buildings. Accordingly, a singleleaf wall is a half brick thickness.
This bond is weak in strength but it is economical brick masonry is made up of brick units bonded together with mortar. Technical notes 31 brick masonry arches january 1995 abstract. The effect of mortar composition and strength on the masonry s flexural bond strength using three types of masonry units. Causes of and solutions to inevitable deterioration scott d. Further research will be ongoing to establish a more definite relationship between the various parameters and bond strength and to investigate effects of mortar, and curing conditions. Brick masonry arches have been used for hundreds of years.
Masonry mortar must bond well to the masonry units in the wall. The method by which individual masonry units are interlocked or tied together to cause the\r\nentire assembly to act as a single structural unit. Bond\r\nthe word bond, when used in reference to masonry, may have three meanings. Brickmortar bond and masonry compressive strength request pdf. The labour required for 1m 3 of brick masonry is for 1. Brick masonry is used for construction of buildings and other structures by using brick stone, stone blocks, brick blocks with different types of masonry. The choice in brickwork bond can also influence the budget. The bond, in which headers and stretchers are laid in alternate courses, is called english bond. This video explains what rat trap bond in brick masonry brickwall is. As the following chapters will show, this building type is typically the most seismically. Rat trap masonry uses fewer bricks and mortar reducing the cost of masonry up to 30% when compared with conventional brick masonry. Eight 8 brick types and 24 mortar mixes were examined. Rat trap bond rat trap bond is a brick masonry method of wall construction, in which bricks are placed in vertical position or laid on edge instead of conventional horizontal position and thus creating a cavity hollow space within the wall.
The bricks being uniform in size can be arranged in a variety of ways. Understand the basics of rat trap bond masonry practice limitations of rat trap. The vertical joints are staggered each time by half a brick. Alternate courses of headers and stretchers are provided as in english bond. Before commencing masonry work, the line out shall be carried out for the entire area using a steel tape. In order to do so, brick were selected which were manufactured in similar processes.
Explore the divisions below to gather product data and access downloadable content including cad files, bim objects, specifications and much more. Various types of bonds used in brick masonry building. The cost of various tools, transportation of materials etc. The dimensions shall be checked with gfc good for construction drawings. This technical notes is an introduction to brick masonry arches. Specification for facing brick solid masonry units made from clay or shale c 279.
The various types of bonds generally used in brick masonry are 1. This design responds to the brick masonry houses with 3 walls which are the most common. The rattrap brick wall can be constructed in 8 or 9 thicknesses its strength is compatible with to standard 9 brick wall, but consumes 20% less. Rattrap bond saves consumption of bricks by 18% and. A leaf is as thick as the width of one brick, but a wall is said to be one brick thick if it as wide as the length of a brick. The load bearing tests done at the anna university has proven that a wall in rat trap bond performs as good as the usual english bond. Flexural bond strength of masonry has been determined by testing stackbonded prisms using a modified bond wrench test setup. Rate analysis of brickwork now requires rates of various materials like cement, sand, bricks, and rates for labour i.
The following are the various types of bonds used in brick masonry. Utility brick bonding bond is more economical than 12 bond by jason yana bond corner since a onethird bond pattern divides the 12 nominal brick into thirds, turning the corner is as natural as it is economical. After the building is constructed, the indoor thermal comfort is achieved using. The heads and bond stones should not be of a dumb bell shape. Evaluating asbuilt properties of masonry wall systems using investigative laboratory and insitu testing techniques. Stone masonry dont need them and hence maintenance cost is more in brick masonry. Evaluating asbuilt properties of masonry wall systems. Ira and the flexural bond strength of clay brick masonry. The other disadvantage is in using concealed wiring and plumbing. Brick absorption, including initial rate of absorption ira, is an important property affecting the bond.
Rat trap bond is a modular type of masonry bond in which the bricks. Test methods for evaluating masonry bond strength c. Considering ira with brick masonry construction specifier. Brick masonry brick masonry is built with bricks bonded together with mortar. These types of masonry units have been used for thousands of years for both utilitarian and monumental structures, most often as loadbearing walls in building structures, as masonry arch bridges, or as retaining walls.
The verticle joints provided in the brick masonry should not continue. A rattrap bond is a type of wall brick masonry bond in which bricks are laid on edge i. Since the head of the brick is 4 nominal, it is one third of. This paper focuses on some issues pertaining to brick mortar bond and masonry compressive strength. Header bond header bond also known as spanish bond was a very common bond for bearing walls. Technical notes revised on brick construction brick industry association 11490 commerce park drive, reston, virginia 20191 wa ter resistance of brick masonr y. Ira and bond as hydration takes place and the mortar cures, chemical bonds form between mortar and brick. Brick masonry absorbs water and there are possibility of dampness. A rat trap bond is a brick masonry bond in which the bricks are placed such that. The following are the salient features of english bond. The brick masonry shall be preferably laid in a composite mortar with mix ratio as mentioned in specification and drawing. Rat trap bond is a brick masonry method of wall construction, in which bricks are placed in vertical position instead of conventional horizontal position and thus creating a cavity hollow space within the wall. The various types of bonds commonly used in the construction of brick masonry are given below.
A masonry unit laid flat with its longest dimension. Rat trap bond brick wall construction by earthbound. Masonry building product and material csi divisions arcat. Brick masonry needs plastering and plastered surface needs colour washing. The air medium that is created by the bond helps maintaining a good thermal comfort inside the building. It is composed of header bricks, set in rows that are offset. Length of the brick is twice its width plus one joint inorder to obtain a uniform lap. The bonds in brick masonry is developed by the mortar filling between layers of bricks and in grooves when bricks are laid adjacent to each other and in layers in walls. These article links provide information on different types of bricks, mortar products, and installation techniques used by masons, construction pros, and diy homeowners. Failure theories for masonry under compression make the assumption that the bond between brick. Types of bonds in brick masonry brick masonry is built with bricks bonded together with mortar.
For breaking the vertical joints in the successive courses, a queen closer is placed after the first header in each heading course. Brickwork is masonry produced by a bricklayer, using bricks and mortar. Every alternate stretcher course, a header is placed next to the 34 brick bat provided at the. Types of bonds in brick masonry wall construction and. Masonstraining programme with house construction training in rat trap bond brickwork, selected brick elements.
Failure theories for masonry under compression make the assumption that the bond between brick and mortar remains intact at the time of failure of the brick or mortar. A study of the compatibility of brick and mortar or. Browse companies that make brick masonry and view and download their free cad details, revit bim files, specifications and other content relating to brick masonry as well as other product information formated for the architectural community. Brick masonry of various types has been used in building construction for thousands of years, and it remains one of the versatile and durable of all building materials.
Flexural bond strength specimens were built with a template to reduce the influence of workmanship. Additions for next version the following are under preparation for the next version of the training package 1. To improve skill and craftsmanship of a mason in carrying out brick masonry in rat trap bond and to impart skill required to lay a sloping micro. Types of bonds in brick masonry wall construction are classified based on laying and bonding style of bricks in walls.
This paper presents a study, including test data and the result interpretation, used in the selection of a compatible brick and mortar mix for a particular project and a comparison with current design practice. Different types of bonds in brick masonry we civil engineers. This paper focuses on some issues pertaining to brickmortar bond and masonry compressive strength. In newly laid masonry with highira brick, water can be rapidly drawn from the mortar during drying, resulting in poor adhesion and incomplete bond between the brick and mortar. Mortar trap is manufactured from highdensity polyethylene hdpe strands woven into a 90% open mesh. G e n e r a l l y, cast iron manhole covers are supported by a circular section of unreinforced brick masonry. If you break one brick, then more than one brick will fall down.
Being a bricklaying mason or a supervisor is a job that needs wisdom of alignment and orientation. This type of bond is effective for developing one brick thick walls. In this type of alternate courses, headers and stretchers are included. There are many different types of brick bonds and each has its own look, installation challenges, and in the case of walls, structural considerations. As the construction is appealing to the eye both internally. Ira also is a property for which a standard test method exists. May, 2009 what are the different types of bonds in brick masonry. This paper deals with an experimental study on flexural bond strength of masonry using various blocks in combination with different mortars. Mortar collection systems mortar trap mortar trap mortar trap is manufactured from highdensity polyethylene hdpe strands woven into a 90% open mesh.
The landmarked chrysler building in new york city is clad in glazed brick. English bond this bond consists of alternate course of headers and stretchers. In this bond the corner of the wall are strengthened. Figure 1 shows a typical brick m a s o n r y m a n h o l e. Types of mortar cement mortar lime mortar cementlime mortar lime surkhi mortar mud mortar. You ought to have knowledge of different types of brick bonds out there are some basic bonds and therefrom are some derived ones that are carved out.
Types of bonds in brick masonry wall construction and their. General principles the stones to be used for stone masonry should be hard, tough and durable. Rat trap bond is a modular type of masonry bond in which the bricks are placed in a vertical position. The various types of bond may also have a secondary, decorative function. Unreinforced brick masonry construction 3 the structural performance of brick masonry buildings depends on the following four types of connections within masonry elements. Rat trap bond construction, advantages, and disadvantages. In addition, there are two pocket handouts in hindi about rat trap bond and conventional english bond masonry. The stones should be perfectly dressed as per the requirements. A rat trap bond is a type of wall brick masonry bond in which bricks are laid on edge i. Without proper bonding in between bricks, it is not possible to construct the wall. Ncma tek national concrete masonry association an information series from the national authority on concrete masonry technology modular layout of concrete masonry tek 512 details 2008 keywords. A brick bond is a pattern in which bricks are laid.
Types of bonds in brick masonry brick masonry bonds. The result showed that the presence of fly ash increased the bond strength. Brick and cmu construction this publication 2012 masonry institute of washington. Experimental approach to investigate the behaviour of brick. Design examples 102 this chapter illustrates application of the 2009 nehrp recommended provisions the provisions to the design of a variety of reinforced masonry structures in regions with different levels of seismicity. Masonry is the worlds most common building material, existing as adobe, brick, concrete masonry, and stone construction. It applies to both brick walls and brick paving for patios and paths, as well as to concrete block and other types of masonry construction. Chamberlain, project manager, oversees a variety of building envelope rehabilitation projects, including those for brick masonry facades, for hoffmann architects. Strength of brick masonry is less than that of stone masonry. Mortar is a composite of cement, lime and sand and sometimes of other. Every stretcher course starts at the quoin with a 34 bat. Section 519 brick masonry and concrete brick or block masonry 519. Construction of building unit bonded together with mortar. Types of brick bonds some of the different types of brick bonds are, 1.
The brick bonds illustrated below represent the most common masonry coursing. Integrity and shear resistance of brick masonry walls is influenced by the extent and quality of bond between mortar and bricks. Rattrap bond is a kind of wall brick masonry bond in which bricks are sited on edge such that the shine r. Bonding may be achieved by overlapping alternate courses rows. The shear bond strength has been obtained from 3 brick triplets. Ross1 1department of civil engineering, university of new mexico, albuquerque, nm, usa 871 2los alamos national lab. Bond, in masonry, systematic arrangement of bricks or other building units composing a wall or structure in such a way as to ensure its stability and strength. The various constituents combine in burning and form cement clinker. From these bonds, an infinite number of bonds and patterns can be developed. Masonry masonry means an arrangement of masonry units which may be brick, rectangularised stone, ashlar or cement blocks laid to a bond and joined together with mortar. The various types of bonds generally used in brick masonry are stretcher bond header bond english bond and flemish bond. Many of the different types of brick masonry arches are discussed and a glossary of arch terms is.
973 454 1415 1225 1001 990 215 618 1267 963 705 1238 340 437 190 1259 1172 440 728 1180 1031 1179 681 1397 1031 1330 1000 467 1583 55 361 1167 482 1124 422 356 666 434 298 895 1256