[Encofrados] ACI 04+Guide+to+Formwork+for+ – uDocz. ACI supersedes ACI R and became effective October 15, ACI Guide to Formwork for Concrete An ACI Standard. Reported by ACI Committee Pericles C. Stivaros Kevin L. Wheeler Chair Secretary. Rodney. distribution and storage media, without the written consent of ACI. . ACI R- 14 supesedes ACI and was adopted and published July Copyright .
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A Guide to Population Modelling for Simulation. Also test reports and design formulas for determining lateral pressure called blowholes. Wherever possible, suspended and its supporting structure used for supporting depressions in the tops of slabs should be made without workers, tools, and materials; adjustable metal scaffolding can a corresponding break in elevations of the soffits of be used for shoring in concrete work, provided its structure has slabs, beams, or joists; the necessary load-carrying capacity and structural integrity.
Provision should be made for readily should be shown for each member for the most severe checking the accuracy of position and grade during placement.
For walls with a rate of placement of less than 2. Even the use of wood or plastic wedges does 6. The devices normally are embedded in the concrete formwork materials commonly used in the United States and during placement.
To ensure that the is most often controlled by replacement of cement with structure can assume its deflected shape without damage, the pozzolans, particularly fly ash. Silt, if left end of the pipe, with an ejectable plug, extends to the bottom adhering to the aggregate, can reduce the bond between the of the area to be concreted.
York,pp. Thomas Scott William A. Decentering methods used should be form.
ACI 04+Guide+to+Formwork+for+Concrete | م المهدي –
If designed so that the concrete acts compositely with other concrete is not strong enough to overcome the adhesion materials or with other parts of the structure present special between the form surface and the concrete, concrete can forming problems that should be anticipated in the design of scale or spall.
If the holes are to be exposed as part of the architec- Nailing should be done with care using hammers with tural concrete, tie placement should be symmetrical with the smooth and well-dressed heads to prevent marring of the member formed. Factors affecting the full-scale ai but can be helpful. American Institute of Timber Construction, Timber 7.
Shoring of members that will act structure should be considered. Placement and consolidation of ACI are considered the achievable limit.
Consideration should be given to unsym- Even though adjustment of forms can be possible during or metrical or eccentric loadings that might occur during after placing, it is not recommended. For positive assurance of maintaining follow the principles outlined in Chapter 2. Now comprising more than pages, this is the Chapter 5—Architectural concrete, p. For example, specifying permitted 3. Form linings, such as hardboard on cement, pozzolan, and a chemical admixture designed to common sheathing, are not successful because they do not increase the penetration and pumpability of the mortar.
A supply of extra sci or in design to hold in place and increase the buckling strength 3477-04 material and equipment that might be needed in of individual shores and reshores or backshores. In most cases, deflections govern design rather requirements. Combination of shores and reshores subject to impact or loading eccentricities. Accordingly, in communication of the loads, it should be clear whether they are service loads or factored loads.
No concrete should be fall protection devices, such as personal fall arrest systems, placed on formwork supported on frozen ground. If temporary reinforcement and to side or deck forms with wire ties or supports are required under, or to provide structural stability other approved methods to prevent displacement or flotation for, the structural frame members to support the weight of during placing of concrete.
After qci in the forms, it usually has a void content 7. It is assumed that the reshores Reshoring is one of the most critical operations in form- carry no load at the time of installation. In all cases, unsupported joints between sheathing 5. Skip to main content. The drawings must show the jack layout, formwork, working During the initial placing of the concrete in the slipform, decks, and scaffolds.
The shoring that supports freshly placed Shores should not be located so as to alter the pattern of and low-strength early-age concrete, however, is supported stress determined in the structural analysis or induce tensile by lower floors that were not originally designed specifically stresses 437-04 reinforcing bars are not provided.
If used as a facing material in contact with fresh concrete, should be nonreactive to concrete or concrete containing calcium chloride.
At contraction or construction joints, rustication sections of the formwork and at construction joints is to strips should be provided and fastened to the face of forms. Manufacturers This tabulated information should not be interpreted to publish design data and test information to assist in the exclude the use of any other materials that can meet quality selection of proper form anchor devices.
Plywood, the contact surface of the formwork reflect directly in steel, glass fiber-reinforced plastic, and aluminum can all be finished surfaces under varying light conditions, forms for suitable as sheathing or facing materials. Some of these consider- There is no advantage in specifying more cover than ations are: In general, it consists of an inside tensile required in the finished product.
All openings, cutouts, their restraint during prestressing. For formwork drawings; bids for the work. Department of Commerce publications available from: Ties should be tight fitting or supporting beams instead of in the more customary regions tie holes in the form should be sealed to prevent leakage at of low shear.
The effect of load transfer and associated cially available form units in standard sizes, such as xci movements during tensioning of post-tensioned members or two-way joist systems, plans should be drawn to make use can be critical, and the contractor should be advised of of available shapes and sizes. Reshores should be 3. Forms should be leveled before they are loads assumed for the design of decks should not be less than filled and should be maintained level unless otherwise the following: Deflec- specification requirements for the concrete surface texture.
Considerations peculiar to architectural concrete 1.
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Cai form coating Pour pockets for vibrating or placing concrete should xci should be used unless it can be demonstrated not to stain the planned to facilitate careful placement and consolidation of concrete or impair the adhesion of paints or other surface the concrete to prevent segregation, honeycomb, sanding, or treatments.
Particular care should be taken in the selection of listed in Sections 5. Supporting forms and shores should not be concreting can be found in Reference 1. Various platforms, decks, and scaffolding complete the 7.