Difference between revisions of "703 - Mortar and Concrete Patching Repair and Resurfacing Mixes"
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Mortar and concrete patching, repair and resurfacing mixtures will be combined in proportions specified for the various types. Unless otherwise specified, air entrained concrete or mortar will be required. Except as otherwise provided, this work will be done according to Section [http://mdotcf.state.mi.us/public/specbook/files/2012/701%20PCC%20for%20Structures.pdf 701]. | Mortar and concrete patching, repair and resurfacing mixtures will be combined in proportions specified for the various types. Unless otherwise specified, air entrained concrete or mortar will be required. Except as otherwise provided, this work will be done according to Section [http://mdotcf.state.mi.us/public/specbook/files/2012/701%20PCC%20for%20Structures.pdf 701]. | ||
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==MATERIALS== | ==MATERIALS== | ||
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===Equipment=== | ===Equipment=== | ||
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Equipment for producing concrete by volumetric batching and continuous mixing will conform to ASTM C 685. The Contractor will be required to demonstrate that the equipment is properly calibrated for yield and proportions by certification and by field tests. Equipment use will be permitted provided that a satisfactory product is obtained, as determined by the Engineer. | Equipment for producing concrete by volumetric batching and continuous mixing will conform to ASTM C 685. The Contractor will be required to demonstrate that the equipment is properly calibrated for yield and proportions by certification and by field tests. Equipment use will be permitted provided that a satisfactory product is obtained, as determined by the Engineer. | ||
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====Mixing Concrete and Mortar==== | ====Mixing Concrete and Mortar==== | ||
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Concrete and mortar patching mixtures may be mixed and transported by any method described in section [http://mdotcf.state.mi.us/public/specbook/files/2012/701%20PCC%20for%20Structures.pdf 701]. Latex modified mixtures will be furnished in continuous mixing equipment. | Concrete and mortar patching mixtures may be mixed and transported by any method described in section [http://mdotcf.state.mi.us/public/specbook/files/2012/701%20PCC%20for%20Structures.pdf 701]. Latex modified mixtures will be furnished in continuous mixing equipment. | ||
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===Mixture Requirements=== | ===Mixture Requirements=== | ||
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Adjustments may be made by the Engineer if the specific material gravity used varies by more than 0.02 from the assumed values. The amount of water specified is approximate. The actual amount of water used will be the least amount necessary to provide the consistency required for the specific mixture. | Adjustments may be made by the Engineer if the specific material gravity used varies by more than 0.02 from the assumed values. The amount of water specified is approximate. The actual amount of water used will be the least amount necessary to provide the consistency required for the specific mixture. | ||
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====Mortar and Concrete Patching Mixtures==== | ====Mortar and Concrete Patching Mixtures==== | ||
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The mixture used will be based on the patched area depth and the length of curing time available before the patches are opened to traffic (see '''''Table 703-1'''''). | The mixture used will be based on the patched area depth and the length of curing time available before the patches are opened to traffic (see '''''Table 703-1'''''). | ||
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====Latex Modified Concrete Overlay Mixtures==== | ====Latex Modified Concrete Overlay Mixtures==== | ||
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In addition to the requirements of Section [http://mdotcf.state.mi.us/public/specbook/files/2012/902%20Aggregate.pdf 902], the 26A course aggregate will be 100 percent crushed. | In addition to the requirements of Section [http://mdotcf.state.mi.us/public/specbook/files/2012/902%20Aggregate.pdf 902], the 26A course aggregate will be 100 percent crushed. | ||
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====Silica Fume Modified Concrete (SFMC) Overlay Mixture==== | ====Silica Fume Modified Concrete (SFMC) Overlay Mixture==== | ||
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[[File:Table 703.04-6.jpg|thumb|center|750px|Table 703-2 - Overlay Mixtures (Metric)]] | [[File:Table 703.04-6.jpg|thumb|center|750px|Table 703-2 - Overlay Mixtures (Metric)]] | ||
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==CONSTRUCTION== | ==CONSTRUCTION== | ||
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<span style="color: red"> -Reserved- </span> | <span style="color: red"> -Reserved- </span> | ||
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==MEASUREMENT AND PAYMENT== | ==MEASUREMENT AND PAYMENT== | ||
<span style="color: red"> -Reserved- </span> | <span style="color: red"> -Reserved- </span> | ||
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Revision as of 14:26, 25 June 2013
GENERAL
Mortar and concrete patching, repair and resurfacing mixtures will be combined in proportions specified for the various types. Unless otherwise specified, air entrained concrete or mortar will be required. Except as otherwise provided, this work will be done according to Section 701.
MATERIALS
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Portland Cement Type I, Type IA |
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Silica Fume |
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Polypropylene Fibers |
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Coarse Aggregate 6AA, 6A, 26A |
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Fine Aggregate, 2NS |
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Latex Emulsion Admixture |
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Water Reducing and Water Reducing-Retarding Admixtures |
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Air-Entraining Admixtures |
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Water |
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Equipment
Equipment for producing concrete by volumetric batching and continuous mixing will conform to ASTM C 685. The Contractor will be required to demonstrate that the equipment is properly calibrated for yield and proportions by certification and by field tests. Equipment use will be permitted provided that a satisfactory product is obtained, as determined by the Engineer.
Mixing Concrete and Mortar
Concrete and mortar patching mixtures may be mixed and transported by any method described in section 701. Latex modified mixtures will be furnished in continuous mixing equipment.
Mixture Requirements
The mixture proportions will be as shown in Table 703-1 of the Standard Specifications for Construction, reprinted here for reference, for the various patching mortar and concrete type:
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Gravel & Stone |
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Slag |
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Adjustments may be made by the Engineer if the specific material gravity used varies by more than 0.02 from the assumed values. The amount of water specified is approximate. The actual amount of water used will be the least amount necessary to provide the consistency required for the specific mixture.
Mortar and Concrete Patching Mixtures
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Fine, medium and coarse |
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Latex modified |
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High Early - increased cement content |
*Type F mixtures are mortars
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Regular Strength |
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High-Early-Strength |
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*Unless otherwise specified, will be at the option of the Contractor.
The mixture used will be based on the patched area depth and the length of curing time available before the patches are opened to traffic (see Table 703-1).
Latex Modified Concrete Overlay Mixtures
This mixture is used for resurfacing existing bridge decks. The mixture used will be according to Table 703-2.
In addition to the requirements of Section 902, the 26A course aggregate will be 100 percent crushed.
Silica Fume Modified Concrete (SFMC) Overlay Mixture
This mixture is used for resurfacing existing bridge decks. The mixture shall be according to Table 703-2. The silica fume admixture is to be supplied in dry-densitied form.
CONSTRUCTION
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MEASUREMENT AND PAYMENT
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