Seldom in their specifications do structural engineers spell out the requirement for support for the wire mesh. Make a 4" slab, 5" thick... make a 6" slab, 7" thick. Use of rolled welded-wire reinforcement is even more problematic. Reinforce slab with 6×6 W2.9xW2.9 welded wire reinforcement centered vertically in the slab and discontinued at the joints. Reduced plastic shrinkage cracking, drying shrinkage cracking and permeability coupled with increased impact resistance and surface abrasion resistance definitely increase the value of the microsynthetic fibers.ABC Polymer Industries (ABC) can provide the correct microsynthetic fiber or macrosynthetic fiber to meet the project specifications/requirements. Many construction projects are now calling for welded wire mesh to be used in making concrete slabs, instead of rebar.
ACI members have it…they are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them.Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.ACI 302.1R-15, Section 5.2.4, recommends that: “Welded wire reinforcement should not be placed on the ground and pulled up after placement of the concrete, nor should the mats be walked in after placing the concrete.” The same section also states that: “Proper support spacing is necessary to maintain welded wire reinforcement at the proper elevation; supports should be close enough such that welded wire reinforcement cannot be forced out of location by construction foot traffic.”Please enter this 5 digit unlock code on the web page. The code also permits the use of microsynthetic fiber at 0.5 to 1.0 lb/cy as plastic shrinkage reinforcement.The cost of wire mesh has become indefensible when compared to Fiber Reinforced Concrete particularly when including the 3-dimensional, quantifiable reinforcement benefits exhibited by the synthetic fibers. The speaker will declare that there is no way the laborer charged with the responsibility of elevating the wire mesh … Never have they stated that the need for supports was mandatory to achieve this goal. Best placement of the mesh ... take the money "saved" by not buying/installing either fiber or wire mesh and "spend" it on extra concrete. It should also be noted that ACI 318 Chapter 7 there is no statement regarding the need for support for the wire mesh.It is obvious that the use of supports would be detrimental to the marketing of wire mesh as temperature-shrinkage reinforcement. Placement of welded wire reinforcement (WWR) in a slab-on-ground Furthermore, we can provide the engineering support required to obtain product approvals. Placement Requirements For Welded Wire Fabric. These leaders in standards of construction have finally recognized the need to require the contractors to place the wire mesh at the correct height in the concrete slabs-on-ground. Wire mesh allows for thinner slab pours, and protects against future cracking by providing a framework for the concrete to hold to. 4. 39-41). The International Code Council (ICC) with construction codes for commercial and residential structures used throughout the U.S. and other countries has included in the 2009 International Residential Code the following verbiage in Chapter 5, Floors:R506.2.4 Reinforcement Support. In today’s market, it is imperative to be knowledgeable and have an edge over the competition. ABC’s microsynthetic fibers, both the fibrillated and monofilament polypropylene are included in ICC ES ESR-1699 as plastic shrinkage crack reinforcement and temperature-shrinkage crack reinforcement. The "hook and pull" technique always results in … Wire mesh is commonly placed in concrete slabs for two primary reasons: -to resist breaking apart and deteriorating when the slab eventually does crack -to increase flexural strength of the slab . For radiant slab, install 1- to 2-inch rigid EPS insulation followed by vapor barrier. Rolls are straightened before use, but the resulting shape is a wavy profile that means WWR location is variable even if it isn’t
The questions that are still nagging are: 1.) For years, the Wire Reinforcement Institute has declared in their publications that the WWF must be at the optimum height in the concrete slab-on-ground to perform as temperature-shrinkage reinforcement.