Grout. 2 History of Grout Reinforced masonry came to the forefront following the 1933 Long Beach,...

Grout

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History of Grout

Reinforced masonry came to the forefront following the 1933 Long Beach, California

earthquake.

Prior to the 1990’s, Michigan designers utilized unreinforced masonry.

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Purpose

Thinner walls

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Purpose

Taller and stronger walls

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Purpose

Sound resistance

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Purpose

Increased Fire Resistance

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Purpose

Improved thermal performance

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Grout

Products

ASTM C 476 Scope

Referenced Documents

Materials

Grout Type and Proportions

Measurement and Production

Application

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ASTM’s Related to Grout

Standard Specifications

C404Standard Specification for Aggregates for Masonry Grout

C476Standard Specification for Grout for Masonry

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not in binder

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Grout

Products

ASTM C 476 Scope


Materials



Application

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C476-02Standard Specification forGrout for Masonry1

1.1 This specification covers two types of grout, fine and coarse grout, for use in the construction of masonry structures. Grout is specified by (1) proportions or (2) strength requirements.

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C1180 – 03aε1

Standard Terminology forMortar and Grout for Unit Masonry1

grout, n – a mixture of cementitious materials, aggregates, water, with or without admixtures, initially produced to pouring consistency without segregation. Requirements for grout are contained in Specification C476.

not in binder

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Grout

Products

ASTM C 476 Scope


Materials



Application

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2. Referenced Documents2.1 ASTM Standards

C 5 Specification for Quicklime for Structural Purposes2

C143/C143M Test Method for Slump of Hydraulic-Cement

Concrete3

C150 Specification for Portland Cement2

C207 Specification for Hydrated Lime for Masonry Purposes2

C260 Specification for Air-Entraining Admixtures for Concrete3


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C404 Specification for Aggregates for Masonry Grout4

C595 Specification for Blended Hydraulic Cements2

C618 Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use as a Mineral Admixture in Concrete2

C989 Specification for Ground Granulated Blast-Furnace Slag for Use in Concrete and Mortars3

C1019 Test Method for Sampling and Testing Grout4

C1157 Performance Specification for Hydraulic Cement2


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C404-03Standard Specification forAggregates for Masonry Grout1

3.1 Aggregates shall consist of natural sand or manufactured sand, used alone or in combination with coarse aggregate as described in this specification.

not in binder

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Grout

Products

ASTM C 476 Scope


Materials



Application

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3.1 Materials used as ingredients in grout shall conform to the requirements specified in 3.1.1-3.1.8.

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3.1.1 Cementitious Materials

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3.1.3 Aggregates

sand

pea gravel

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3.1.4 Water

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3.1.5 Admixtures – Integral waterproofing compounds, accelerators, or other admixtures not mentioned definitely in the specification shall not be used in grout for use in reinforced masonry without approval from the purchaser.

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3.1.6 Pumping Aids – Pumping aids are permitted to be used in cases where the brand, quality, and quantity are approved in writing by the purchaser or are definitely stipulated in the specification.

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3.1.7 Antifreeze Compounds – No antifreeze liquids, salts, or other substances shall be used in grout to lower the freezing point.

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3.1.8 Storage of Materials – Cementitous materials and aggregates shall be stored in such a manner as to prevent deterioration or intrusion of foreign material or moisture. Any material that has become unsuitable for good construction shall not be used.

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Grout

Products

ASTM C 476 Scope


Materials



Application

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4.1 Type – Grout type shall be specified as fine or coarse.


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Note 2 – Building code provisions and grout space dimensions should be reviewed when selecting grout type or types.

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4.2 Proportions of Ingredients – Grout proportions shall be determined by one of the following methods:

4.2.1 Requirements of Table 1.

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TABLE 1 Grout Proportions by Volume

Type

Parts by Volume of Portland

Cement or Blended Cement

Parts by Volume of

Hydrated Lime or Lime Putty

Aggregate,

Measured in a Damp,

Loose Condition

Fine Coarse

Fine Grout

1 0 – 1/10

2¼ - 3 times the sum of the volumes of

cementitious materials

---

Coarse Grout

1 0 – 1/10

2¼ - 3 times the sum of the volumes of


1-2 times the sum of volumes of the



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NCMA TEK 9-2 (2002)Grout for Concrete Masonry

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4.2.2 Specified Compressive Strength – Proportions established by 28-day compressive strength tests in accordance with Test Method C1019 that obtain the specified compressive strength. The grout shall be mixed to a slump of 8 to 11 in. as determined by Test Method C143/C143M and shall have a minimum compressive strength of 2000 psi at 28 days.

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ASTM C 476


Proportions of Ingredients

Table 1• By

volume

Specified Compressive Strength

• Proportions established by 28-day comp. strength tests (C1019)

• Slump of 8 to 11 inches• Minimum compressive

strength of 2000 psi at 28 days

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C1019-03Standard Test Method forSampling and Testing Grout1

Note 1 – The testing agency performing this test method should be evaluated in accordance with Practice C1093.

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Note 3 – Nonabsorbent blocks may be of plastic, wood, or other nonabsorbent material. Certain species of wood contain sugars which retardation of cement. In order to prevent this from occurring, new wooden blocks shall be soaked in limewater for 24 h, sealed with varnish or wax, or covered with an impermeable material prior to use.

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5. Test Specimens5.1 Each grout specimen shall have a

square cross-section, 3 in. or larger on the sides and twice as high as its width. Dimensional tolerances shall be within 5% of the width selected.


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6. Mold Construction6.1 Select a level location where the molds

remain undisturbed for 48 h.

Note 5 – The location of specimen construction should be protected and as free from perceptible vibration as possible.


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6.3 Form a space with a square cross-section, 3 in. or larger on each side and twice as high as its width, by stacking masonry units of the same type and moisture condition as those being used in the construction. The surface of the unit in contact with the grout specimen shall not have been previously used to mold specimens…


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6.3 …Tolerance on space and specimen dimensions shall be within 5% of the specimen width. See Fig. 1, Fig. 2, and Fig 3 and accompanying notes.


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Note 6 – Other methods of obtaining grout specimens and specimens of different geometry have been employed in grout testing, but are not described in this test method. Other methods used to obtain grout specimens include: drilling grout-filled cores of regular units; filling cores of masonry units specifically manufactured to provide grout specimens; filling compartments in slotted corrugated cardboard boxes specifically manufactured to provide grout specimens; and forming specimens from different sized masonry units of the same or similar material…

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…Since test results vary with methods of forming and specimen geometry, comparative test results between the specimen described in this test method and the proposed specimen should be required and confined to a single specimen shape and method of forming.

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6.4 Line the masonry surfaces that will be in contact with the grout specimen with a thin, permeable material to prevent bond to the masonry units.

Note 7 – The lining, such as paper towel, is used to aid in stripping the grout specimen from the mold. Proper installation of the lining prevents irregularly sized specimens and varying test results.


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8. Temperature and Slump Test8.1 Measure and record the temperature of

the grout sample in accordance with Test Method C1064/C1064M.

8.2 Begin filling the slump cone within 5 min of obtaining the final portion of the sample.


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8.3 Measure and record the slump in accordance with the requirements of Test Method C143/C143M


8 to 11 inches

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9. Compressive Test Specimen9.2 Fill the mold with grout in two layers of

approximately equal depth. Rod each layer 15 times with the tamping rod. Rod the bottom layer through its depth. Slightly overfill the mold. Rod the second layer with the tamping rod penetrating ½ in. into the lower layer. Distribute the strokes uniformly over the cross section of the mold.


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9.3 Strike off the top surface of the specimen with a straightedge to produce a flat surface that is even with the top edge of the mold and that has no depressions or projections larger than 1/8 in. Cover immediately with a damp absorbent material such as cloth or paper towel.


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9.4 Within 30 min after filling the mold, add sufficient grout without rodding to fill the depression caused by initial water loss…

9.5 Protect the specimens from freezing and variations in temperature…


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10. Transportation, Curing, and Testing of the Specimens

10.1 Remove the molds between 24 and 48 h after making the specimens.

10.2 Within 30 min after removing the molds, place specimens in a protective container and keep specimens damp.


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10.3 Transport field specimens to the laboratory within 8 h after mold removal.

10.4 Within 8 h after mold removal, place in a moist room, moist cabinet, or water storage tank conforming to Specification C511. Store there until day of testing.


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Grout

Products

ASTM C 476 Scope


Materials



Application

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5. Measurement and Production5.1 Measurement of Materials – Measure

materials for grout such that the required proportions of the grout materials are controlled and accurately measured.

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5.2.1 Materials Mixed at Job Site:

5.2.1.1 Individual cementitous materials and aggregates stored at the job site shall be mixed in a mechanical mixer for a minimum of 5 min with sufficient water to achieve the desired consistency.

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5.2.1.2 Individual dry ingredients transported to the job site in suitable compartments shall be mixed with water at the job site using continuous volumetric proportioning equipment to achieve the desired consistency. Mix with an auger of appropriate length to provide adequate mixing.

Typically not used in

Michigan.

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5.2.2 Materials Transported to the Job Site:

5.2.2.1 Factory dry-blended cementitious materials and aggregates delivered to the job site shall be mixed in a mechanical mixer for a minimum of 5 min with sufficient water to achieve the desired consistency.

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5.2.2.2 Wet-mixed grout shall arrive at the job site in a ready-mixed condition. Slump shall be adjusted as necessary, and grout shall be re-mixed at mixing speed for at least 1 min before discharging to achieve the desired consistency.

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Grout

Products

ASTM C 476 Scope


Materials



Application

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NCMA TEK 3-2 (2003)Grouting Concrete Masonry Walls

In reinforced concrete masonry wall construction, grout often is placed only in wall spaces containing steel reinforcement. The grout bonds the masonry units and steel so that they act together to resist imposed loads. In some reinforced loadbearing masonry walls, all cores with and without reinforcement are grouted to further increase the wall’s resistance to loads.

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NCMA TEK 3-3A (2001)Reinforced Concrete Masonry Construction

Standard two-core concrete masonry units can be effectively reinforced when protruding lap splices are not long, since the mason must lift the units over any protruding reinforcing bars.

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NCMA TEK 3-3A (2001)Reinforced Concrete Masonry Construction

Open-ended units allow the units to be placed around reinforcing bars. This eliminates the need to thread units over the top of the reinforcing bar.

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• Grout is a material used in reinforced masonry that is quite misunderstood.

• Grout is not mortar and grout is not concrete.• The big difference between concrete, mortar and

grout is their plasticity or fluidity in the initial stage.

Grout…the Third Ingredient

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Date post:	30-Mar-2015
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