Unreinforced concrete cracks at all thickenings, ends of embedded steel, bollards, pit corners and down the middle of aisles. Concrete masonry lintels make it easy to maintain the bond pattern, color, and surface texture of the surrounding masonry. Naylor concrete lintels have a low water absorption as a result of the dense concrete mix used in the manufacturing process. The main advantage of the rc lintels is adaptability to suit any size and shape. Naylor lintel stockists are located throughout the uk to give backup and local supply facilities to the end user. High strength and high performance concrete materials and. Loading shown is superimposed load capacity of lintel. For more information on steel and concrete lintels contact our technical team, and you can look at our blog post on why you might want to specify concrete lintels and dont forget to sign up for our monthly. The con figuration of the wall is shown in figure 4. Installation guidelines standard cavity wall lintels. At present, the lintel made of reinforced concrete are widely used to span the openings for doors, windows, etc. All naylor lintels are wet cast and have a concrete strength of 50 knmm2. Solid lintel rebar is grade 60 steel astm 615 all units meet 4inch minimum bearing length concrete compressive strength is 3,000 psi minimum fire rating is 1 12 hours rebar placement. Assume fully grouted clay masonry with a nominal thickness of 8 in.
Pdf lintel beams are constructed on the top of openings in the wall like windows and doors. They can be used underground providing that the ends of the units are encased in a minimum of 45mm of mortar to the ends of the reinforcing strands. Concrete lintel technical information about naylor. These are suitable for all the loads and for any span. All fire rated lintels produced by naylor lintels comply with bs8110. Pdf shake table response of unreinforced masonry and. The design of reinforced masonry and precast concrete lintels. Pdf halfscaled reinforced concrete frame of two storeys and two bays with. The design of precast concrete lintels is based on the 1995 building code requirements for structural concrete aci 318. The table above is for safe working, uniformly distributed loads applied to the composite construction in knm exclusive of self weight of brickwork within the construction and the weight of the lintel. Concrete lintels are prestressed and made from high strength concrete 65mpa which gives the lintels their superior structural capacity. Lintels are manufactured to an actual height of 758 inches to coincide with the typical course height of concrete masonry.
The specimens used in this study include aac lintels without frp and. They are usually bought premanufactured, but can be made to measure on site. Supreme concrete textured prestressed lintel 140 x 100 x 2400mm. Data seet 3 concrete masonry intels march 20 1 d the concrete masonry association of australia imited is a nonprofit organisation sponsored by the concrete masonry industry in australia to provide information on the many uses of concrete masonry products. Aci 530 05 building code requirements for masonry structures. Lay mesh under the lintel and attach to the exterior edge of the bags beneath. Quantities of materials per cubic metre of concrete. For maximum size of coarse aggregates as 16mm, sand and coarse aggregates should be in equal parts. These are designed based on the dimensions of the openings above which it is built. A modular lintel length should be specified which equals the clear span plus at least two times the lintel height to provide for proper bearing at each end. Concrete lintel concrete lintel a load bearing building component that that spans the space or opening between two vertical supports. Curing methods for different types of concrete construction. A lintel is a block or plate of concrete used to fill gaps on buildings or during construction work. Supreme concrete prestressed lintel textured 140 x 100 x 1500mm.
For masonry material, self weights were calculated using the effective span of the lintel. Technical services a technical service is available and advice is given for particular requirements and applications. This section focuses on the design of concrete lintels in accordance with. Specimens of conventional reinforced concrete were also tested for.
Design and analysis of concrete masonry and precast. Acs precast architectural concrete standard specifications. V c nominal shear strength provided by concrete, lb. Concrete lintels prestressed concrete lintels bespoke lintels. V n nominal shear strength of a crosssection before application of strength reduction factor, lb. Masonry design reinforced concrete masonry lintel design example. Loads above openings are carried by horizontal structural members known as lintels. Wall panel load attribution and load transfer for risafloor. The cost of installation will be a factor, but when it comes down to the product, on a like for like basis, concrete will cost less. Standard concrete lintel stock lengths range from 600mm to 3600m with nonstandard lengths available to order. Pdf an experimental study of autoclaved aerated concrete lintels. More details supreme concrete textured prestressed lintel 140 x 100 x 2400mm grey.
Allowable stress design of concrete masonry lintels. Concrete lintel technical information about naylor concrete lintels. High strength prestressed concrete lintels concrete. The lintel has a span of 10 ft, and a total depth height of parapet plus distance between the roof and the.
Prestressed lintels should be placed rough side up to achieve maximum bond with the composite blockwork above. All lstrips are manufactured from steel complying with bs. In the case of more than one significant point load, the point loads must be spaced at least 450mm apart. This means it can be installed in visible areas and can be painted by the user or installer for even more flexibility. Types of design loads for masonry lintel and their. How to identify unreinforced masonry buildings urm arch over window deep, recessed windows high parapet walls tie plates lintel over window king row every 5 7 bricks. Equivalent apex load for 8 x 8 lintel with effective span of 48 apex load. Precast prestressed concrete lintels and reinforced lintels noncoo mpsite lintel maximum uniformly distributed load knm section h w mm 150 100 00 1 150 15 2 100 weightlinear metre kg 34 34. Recommended concrete mixes for various types of construction. Additional sizes in dense textured concrete lintels available on special order and require a customer 1. Concrete is effectively a commodity and as such a concrete lintel usually costs the builder or installer a lot less than a steel lintel version. From 1st july 20, under the construction products regulation cpr it will become mandatory for manufacturers and distributors to declare the performance and apply ce marking to any of their products which are covered by a harmonised european standard hen. We supply paving brick, fire brick, flue linings, masonry cement, architectural block, split face block, decorative wall block, concrete wall systems, segmental retaining wall systems, ep henry products, new holland products, and much more.
If moisture can penetrate through the outer skin of the lintel and is able to reach the steel reinforcement, it leads to corrosion which means the steel expands, making the concrete spall and crack, ultimately. Concrete lintels are a great solution to providing economical and robust masonry support for load bearing over doors and windows buildbase can supply prestressed concrete lintels for new or replacement windows and doors. Lintels are professionally designed, laboratory tested and textured to match lightweight and heavyweight concrete block. Tests for water quality for concrete construction and recommended limits. They are generally installed between brick and blockwork, and covered from underneath.
Lintel is defined as a transverse load beams which are positioned over an opening in a wall to support the imposed loads above the lintel as shown in figure1. The problem arises however that more joints are generally not a good solution for a floor subject to. They are steelreinforced in order to carry heavy weights and to prevent the concrete plates from breaking during fitting. A fair faced concrete lintel is a high performance prestressed concrete lintel with a type c finish. Point loads must be flat on the lintel, bear over at least 50mm of the lintel length, and must be either against the. Because concrete lintels are made from such high quality concrete they are more durable than steel lintels. The design is based on the brickwork having a limiting crushing strength of 10.
The reinforced concrete lintel has fireresisting properties. Fabricated concrete lintel 3600 x 150 x 175mm select nearest store. Concrete lintel brochure precast concrete lintels brochure. The inclusion of additional jointing, at a shorter spacing, is a necessary component of a good unreinforced slab plan. Condell ltd specialises in building materials and can supply both information and materials for any project from small diy jobs to commercial developments. The height of ma sonry required for arching action is computed. Various types of loads are subjected on masonry lintel which need to be identified and calculated for design of masonry lintels. Lintel failure, lintel reinforcement, the modern way. Type, batch or serial number or any other element allowing identification of the construction product as required under article 114 of the cpr. Loadmaster systems materials used in the construction of masonry lintels include bond beam sections, mortar, grout and steel. It can be formed as bricks on end, bricks on edge, and coursed bricks.
This method of repair is not incorrect and will restore the structural integrity of the masonry but it can be costly, time consuming and disruptive. The prestressing system gives the concrete lintel a high strength to section ratio, minimizing costs and making for safer manual handling. Although the steel reinforcing provides more strength to the lintel, it does make the concrete vulnerable to moisture ingress. Brick lintels are constructed with hard, well burnt firstclass brick.
Cover lintel with metal flashing that extends past each end and is wide enough to cover the outside edge of the lintel. Shukuma flooring quality policy the underlying quality system has been established in accordance with iso 9001. Lintels shall be considered structural members and shall be designed in accordance with the applicable provisions of chapter 16. V s shear strength provided by shear reinforcement, lb. I can find no prescriptive requirements that allow a masonry lintel anywhere in the. Traditional methods often involve the removal of the existing failed lintel and the installation of a new lintel often a concrete or catnic type lintel. With quality and trusted products from naylor and supreme concrete, we stock a wide range of surface finishes in a variety of dimensions and loadings. An information series from national concrete masonry. Concrete lintel, precast concrete lintels, prestressed. The aci 31819 set durability demand for concrete based on the category exposure and class exposure of the structure, dependent on the ground and weather situation. Mortar should be present at all contact surfaces between bricks and lintel 150mm 100mm solid base angle span mm 1200 1500 1800 2100 2400 2700 3000 bar length mm 1200 1500 1800 2100 2400 2700 3000 3300 load kg 2083 1736 1265 878 645 486 384 311.