1724 - SILICONE RUBBER SURFACE CRACK SEALANT 1700-36
1724.1 Description
This specification covers material for sealing su rface cracks previous to epoxy resin crack repair.
1724.2 Requirements
a. Provide Type S, Grade NS, Class 50, NT or O, on e-part, clear or gray, neutral-cure, silicone rubber sealant that easily extrudes in any weather and cures quickly at room temperature. b. Provide sealant that complies with TABLE 1724-1. TABLE 1724-1: ONE PART SILICONE SEALANT Property Test Method Requirement Tack-Free Time ASTM C 679 3 hrs Working Time ASTM C 639 20-30 minutes Peel Strength ASTM C 794 32 lb/in Tensile Adhesion Strength ASTM C 1135 45 psi at 25% extension c. Clean all tools and other application or mixing equipment frequently using a solvent type that is approved by the crack sealant manufacturer.
1724.3 Test Methods
Test the material in accordance w ith the ASTM standards stated in subsection 1724.2.
1724.4 Prequalification
a. All silicone rubber sealant intended for use under this specification must be prequalified on the basis of Type, Grade, Class and Use prior to prequalification. Manufacturers desiring to supply material for KDOT jobs must submit a written request to the Bureau Chief of Cons truction and Materials, with the following information for each type and brand name:
1.Name, address and telephone number of the manuf acturer. Include the name of the preferred contact person.
2.Brand name of the material.
3.Type, Grade, Class and Use of the material.
4.Information regarding recommended usage and application instructions.
5.Material Safety Data Sheets.
6.One copy of a certified test report prepared by a laboratory regularly in spected by the Cement and Concrete Reference Laboratory (CCRL) of the National Institute of Standards Technology or other approved reference laboratory, showing test resu lts complying with ASTM C 920. Include evidence that the laboratory is inspected regularly. b. The information and test reports will be reviewed by the Bureau Chief of Construction and Materials. The manufacturer will be advised as to whether or not the product is prequalified. c. The Bureau of Construction and Materials will mainta in a list of prequalified silicone rubber sealants. Products will remain prequalified as long as the formula tion and manufacturing processes remain unchanged, and field experience indicates that the materi al functions appropriately. Failure of the material to function in the field will be cause for removal of the product from prequalified status. Products removed from prequalified status will be considered for requalification if the manufacturer can provi de evidence that the cause of failure has been positively identified, and necessary formulation changes and quality control measures have been implemented to eliminate that cause. Complete prequalification testing may be required for products that have been removed from prequalified status.
1724.5 Basis of Acceptance
Receipt and approval of a Type D certification as specified in DIVISION 2600.
Get an email when 1724 changes
Kansas revises spec sections through supplementals and new editions. We check this one every week and email you the day it changes. Free, no account.
Source: Standard Specifications for State Road and Bridge Construction, 2015 Edition. Pages 826–826 of 978. View official source ↗