912CONCRETE CURING MATERIALS AND ADMIXTURES

912.01Curing Materials

Curing materials shall be in accordance with the following requirements.

This material shall be new or reclaimed and thoroughly vacuum cleaned burlap. Burlap from sugar, salt, or fertilizer bags shall not be used. The burlap shall weigh no less than 10 oz/sq yd and shall be in strips of not less than 40 in. or more than 120 in. wide and no less than 2 ft longer than the width of the pavement being cured. 10

These blankets shall be in accordance with ASTM C171.

The sheeting shall be in accordance with ASTM C171.

These sheets shall be in accordance with ASTM C171.

Materials shall be selected from the QPL of Liquid Membrane Forming Curing Compounds.

Storage of liquid membrane forming compounds shall be in accordance with the manufacturer’s recommendations. Compounds shall be kept from freezing and shall not be applied when the ambient temperature is less than 40ºF. Compounds that are more than one year past the date of manufacture shall not be used.

Products will be considered for incl usion on the QPL of Liquid Membrane 30 Forming Curing Compounds by completing the requirements in ITM 806, Procedure

PEAS. To maintain approval, the manufacturer shall submit an annual recertification letter to the Department by January 1 of each year. The manufacturer shall also submit 912.01

a Type A certification for a single batch every four months to the Department’s Division of Materials and Tests.

These compounds shall meet or exceed requirements of ASTM C309, Type 2, Class A, when tested in accordance with ASTM C156. 40

These compounds shall be in accordance with ASTM C309, Type 2, Class B, 100% Poly-alpha-methylstyrene, PAMS, resin with the following exceptions:

PAMS Curing Compound Properties Physical Tests Specification Requirements Total solids, % by weight of compound ASTM D2369 • Reflectivity, % in 72 h ASTM E1347 • Loss of water, kg/m² in 24 h ASTM C156 ” Loss of water, kg/m² in 72 h ASTM C156 ” Infrared Spectrum, vehicle Match reference IR scan 100% poly-alpha- methylstyrene V.O.C. Content, g/L 326 IAC 8-15 < 350 Long-Term Settling Test, ml/100 ml in 72 hrs PEAS ”

Samples of PAMS curing compound may be obtained randomly for verification at the point of incorporation into the work in accordance with 106.02. Verification testing will include:

The sheeting shall be in accordance with ASTM C171.

912.02Blank 60

912.03Admixtures for Use in Concrete

Admixtures for use in PCC shall be selected from the QPL of PCC Admixtures and Admixture Systems. An admixture will be considered for inclusion on the QPL by completing the requirements in ITM 806, Procedure D. Admixtures containing chloride added as an ingredient of manufacture will not be acceptable.

912.02

Air-entraining admixtures are materials to be added to PCC mixtures at the mixer for the purpose of entraining air. 70

Chemical admixtures are ma terials to be added to PCC mixtures at the mixer for purposes indicated below.

Type A is a water reducing admixture that reduces the quantity of mixing water required to produce concrete of a given consistency.

Type B is a retarding admixture that retards the setting of concrete.

Type C is an accelerating admixture that accelerates the setting and early strength development of concrete.

Type D is a water reducing and retarding admixture that reduces the quantity of mixing water required to produce concrete of a given consistency and retards the setting of concrete. 90

Type E is a water reducing and accelerating admixture that reduces the quantity of mixing water required to produce concrete of a given consistency and accelerates the setting and early strength development of concrete.

Type F is a high range water reducing, HRWR, admixture that reduces the quantity of mixing water required to produce concrete of a given consistency by 12% or greater. 100

7 . T y p e G Type G is a high range water reducing and retarding, HRWRR, admixture that reduces the quantity of mixing water required to produce concrete of a given consistency by 12% or greater and retards the setting of concrete.

HRWR admixture system is a combinatio n of admixtures that act as a Type F admixture within a concrete mixture. The system consists of chemical admixtures and an air-entraining admixture. One of the components shall be a Type F admixture. 110 Components shall be in accordance with 912.03 for their respective types.

912.03

HRWRR admixture system is a combinatio n of admixtures that act as a Type G admixture within a concrete mixture. The system consists of chemical admixtures and an air-entraining admixture. One of the components shall be a Type F or a Type G admixture. One of the components shall retard the setting of the concrete. Components shall be in accordance with 912.03 for their respective types.

( c ) T e s t R e p o r t 120 Testing shall be performed by a recognized laboratory in accordance with ITM 806.

AASHTO M 154.

M 194 for their respective types.

of the approval year. New submittals of test reports more than five years old will be accepted if all subsequent five year limited retest reports are submitted. Subsequent limited retest results shall comply with the dating and age requirements specified above and shall include the following tests as a minimum requirement for compliance:

gravity,

912.04Latex Modifiers

Latex modifiers are an admixture to be added to the concrete mixture at the continuous mixer. The latex shall be one of the latex modifiers on the QPL of Latex Modifiers. 150

The formulated latex admixture shall be a non-toxic, film forming, polymeric emulsion in water to which all stabilizers have been added at the point of manufacture and shall be homogeneous and uniform in composition.

A Type B certification in accordance with 916 shall be provided for the latex modifiers. The limits of the following shall be shown on the certification:

912.04

Polymer Type ............................ Styrene Butadiene Stabilizers .................................. Anionic and Nonionic Surfactants 160 Antifoaming Agent .................... Polydimethylsiloxane Percent Solids, % by Mass ........ 46.0 minimum Mass Per Gallon ........................ 8.4 lb at minimum pH (as shipped) .......................... 9.0 - 11.0 Freeze/Thaw Stability ................ 5 Cycles, -15° to 25°C Shelf Life ................................... 2 Years, minimum Color .......................................... White

912.05Foaming Agent

Foaming agents used in making preformed foam for cellular concrete fill and 170 cellular concrete grout shall be in accordance with ASTM C869. A Type C certification in accordance with 916 shall be provided for the foaming agent.

912.06Synthetic Fibers for Use in PCC

Synthetic, non-metallic fibers are used for concrete three-dimensional reinforcement to promote post-crack control and improve the long-term performance of PCC. Synthetic fibers shall be introduced into PCC mixtures at a minimum dosage rate of 4.0 lb/cu yd at the batching plant or a ready-mix truck. 180

Synthetic fibers for use in PCC shall be selected from the QPL of Synthetic Fibers. Hybrid fibers which include a combination of macro and micro fibers will be accepted. Synthetic fibers will be considered for inclusion on the QPL by completing the requirements in ITM 806, Procedure F.

Synthetic fibers shall be Type III in accordance with ASTM C1116 and ASTM D7508 with the following exceptions: 190

Testing shall be in accordance with ASTM C1579 and ASTM C1609, using roller 200 supports meeting the requirements of ASTM C1812.

Testing of fiber-reinforced concrete shall be performed by a recognized independent commercial laboratory and regularly inspected by the CCRL for PCC 912.06

materials, to ensure that the properties of the fiber-reinforced concrete are in accordance with the following:

Required Hardened Fiber-Reinforced Concrete Properties Physical Test Specif ication Requirements Equivalent Residual Flexural Strength ( fT,150 150 or fe3)*, min. ASTM C1609 150 psi Equivalent Flexural Strength Ratio (RT,150 150 or Re3)*, min. ASTM C1609 25% Crack Reduction Ratio, (CRR), min. reduction ASTM C1579 >85% * The specimens shall be tested when the concrete ultimate flexural strength at peak stress (fp ) is a minimum of 650 psi. For 6 by 6 by 20 in. FRC beam the maximum required net deflection value of 1/150 of the 18 in. span length is 0.12 in.