Section 2105

A quality assurance program shall be used to ensure that the constructed masonry is in compliance with the approved construction documents.

The quality assurance program shall comply with the inspection and testing requirements of Chapter 17 and TMS 602.

, f ′ m . [OSHPD 1R, 2 & 5] The specified compressive strength, f ′ m, assumed in design shall be 2,000 psi (13.79 MPa) for all masonry construction using materials and details of construction required herein. Testing of the constructed masonry shall be provided in accordance with Section 2105.5 or 2105.6.

Exception: Subject to the approval of the enforcement agency, higher values of f ′ m may be used in the design of reinforced grouted masonry and reinforced hollow-unit masonry. The approval shall be based on prism test results submitted by the architect or engineer which demonstrate the ability of the proposed construction to meet prescribed performance criteria for strength and stiffness. The design shall take into account the mortar joint depth. In no case shall the f ′ m assumed in design exceed 3,000 psi (20.7 MPa).

Where an f ′ m greater than 2,000 psi (13.79 MPa) is approved, the architect or structural engineer shall estab- lish a method of quality control of the masonry construc- tion acceptable to the enforcement agency which shall be described in the contract specifications. Compliance with the requirements for the specified strength of constructed masonry shall be provided using the prism test method and core shear testing in accordance with Sections 2105.5 and 2105.4. Substantiation for the specified compressive

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100735044

MASONRY

strength prior to the start of construction shall be obtained by using the prism test method in Section 2105.5.

These tests are to establish whether the masonry components meet the specified component strengths.

At the beginning of all masonry work, at least one test sample of the mortar shall be taken on three successive work- ing days and at one-week intervals thereafter. Samples of grout shall be taken for each mix design, each day grout is placed, and not less than every 5,000 square feet of masonry wall area. They shall meet the minimum strength requirement given in ASTM C270 Table 1 and TMS 402 Section 7.4.4.2.2 for mortar and ASTM C476/TMS 602 Section 2.2 for grout. Additional samples shall be taken whenever any change in materials or job conditions occur, as determined by the build- ing official. When the prism test method in accordance with Section 2105.5 is used during construction, the tests in this section are not required.

Test specimens for mortar and grout shall be made as set forth in ASTM C1586 and ASTM C1019.

Exception: For nonbearing nonshear masonry walls not exceeding total wall height of 12 feet above top of founda- tion, mortar test shall be permitted to be limited to those at the beginning of masonry work for each mix design.

. [OSHPD 1R, 2 & 5] Not less than two cores shall be taken from each building for each 5,000 square feet (465 m ² ) of the masonry wall area or frac- tion thereof. The approved agency shall perform or observe the coring of the masonry walls and sample locations shall be subject to approval of the registered design professional.

Core samples shall comply with the following:

1. Cored no sooner than 7 days after grouting of the selected area; 2. Be a minimum of 3 ³ /4 inch nominal diameter; and 3. Sampled in such a manner as to exclude any masonry unit webs, mortar joint, or reinforcing steel. If all cells contain reinforcement, alternate core locations or means to detect voids or delamination shall be selected by the registered design professional and approved by the building official.

Visual examination of all cores shall be made by an approved agency and the condition of the cores reported as required by the California Administrative Code. Shear tests of both joints between the grout core and the outside wythes or face shell of the masonry shall be made 28 days after grouting of the sample area using a shear test apparatus acceptable to the enforcement agency. Core samples shall not be soaked before testing. Core samples to be tested shall be stored in sealed plastic bags or nonabsorbent containers immediately after coring and for at least 5 days prior to testing. The aver- age unit shear value for each pair of cores (4 shear tests) from each 5,000 square feet of wall area (or less) on the cross sec- tion of core shall not be less than 2.5 f ′ m psi.

All cores shall be submitted to an approved agency for examination, even where the core specimens failed during the cutting operation. The approved agency shall report the loca- tion where each core was taken, report the findings of their

visual examination of each core, identify which cores were selected for shear testing, and report the results of the shear tests.

Exceptions:

1. Core sampling and testing is not required for non- bearing nonshear masonry walls, not exceeding total wall height of 12 feet above the top of the foun- dation, built with single-wythe hollow unit concrete masonry that attaches opposite face shells using webs cast as single unit, when designed using an f ′ m not exceeding 2,000 psi (13.79MPa).

2. An infrared thermographic survey or other nonde- structive test procedures shall be permitted to be approved as an alternative system to detect voids or delamination in grouted masonry in conjunction with reduced core sampling and testing. A minimum of two cores shall be taken from each building for each 10,000 square feet (930 m ² ) of the wall.

. [OSHPD 1R, 2 & 5] The prism test method performed prior to the start or during construction shall be in accordance with TMS 602 Section 1.4 B.3. The prism test method performed on constructed walls shall be in accordance with TMS 602 Section 1.4 B.4.

. [OSHPD 1R, 2 & 5] Unit strength method testing shall be performed in accor- dance with TMS 602 Section 1.4 B.2.