ASTM C 881 :- Epoxy-Resin-Base Bonding Systems for Concrete

Standard Specification for
Epoxy-Resin-Base Bonding Systems for Concrete

This specification covers two-component, epoxy-resin
bonding systems for application to Portland-cement concrete,
which are able to cure under humid conditions and bond to
damp surfaces.

This specification does not cover epoxy-resin-base
bonding systems that have been modified by addition of
components such as cement, fine aggregate, or fiber reinforcement. Additional testing may be required to meet applicable
specifications for these applications.

This specification does not address the effects of creep
on epoxy-resin-base bonding systems while under load or the
potential for creep rupture. Additional testing is required for
applications where creep and creep rupture are critical.

Terminology

Binder :- The cementitious part of a grout, mortar, or
concrete that binds the aggregate or filler into a cohesive mass.

Bonding system :- The product resulting from the
combination of all the components supplied for use as a
bonding material.

Component :– A constituent that is intended to be
combined with one or more other constituents to form a
bonding system.

Contact strength :- Bond strength measured by slant
shear after a specified contact and cure time.

Contact time :- specified time between when the
epoxy system is applied and when the two segments are
bonded together and still achieve a specified bond strength
after a specified curing time and temperature.

Curing agent :- a substance that causes the conversion of a fluid resin system to a solid cured resin by means of
a chemical reaction.

Epoxy equivalent :- The weight of resin containing
one molecular weight of epoxy groups.

Epoxy resin :- A resin that contains or did contain
epoxy groups principally responsible for its polymerization.

Filler :- A finely divided solid, predominantly passing
the 75-µm [No. 200] sieve, that is used to improve certain
properties of the bonding system or to reduce cost.

Formulator :- The agency responsible for preparing
the separate components and for recommending the proportions to be used in preparing the final bonding system.

Lot or batch :- That quantity of manufactured material which has been subjected to the same unit chemical or
physical processes intended to make the final product substantially uniform.

Reactive diluent :-A relatively free flowing liquid
used to reduce the viscosity of the liquid resin or resin mixture,
and which contains reactive groups that cause it to become an
integral part of the cured resin.

Working (pot) life :- The time after mixing during
which a bonding system or mixture containing it retains
sufficient workability for proper use.

Classification

This specification provides for the classification of
epoxy-resin bonding systems by type, grade, class, and color

Types—Seven types of systems that are distinguished by
the requirements of Table 1 are recognized: 1 

Type I—For use in non-load bearing application for
bonding hardened concrete to hardened concrete and other
materials, and as a binder in epoxy mortars or epoxy concretes. 

Type II—For use in non-load bearing applications for
bonding freshly mixed concrete to hardened concrete.

Type III—For use in bonding skid-resistant materials
to hardened concrete and as a binder in epoxy mortars or epoxy
concretes used on traffic bearing surfaces (or surfaces subject
to thermal or mechanical movements). 

Type IV—For use in load bearing applications for
bonding hardened concrete to hardened concrete and other
materials and as a binder for epoxy mortars and concretes.

Type V—For use in load bearing applications for
bonding freshly mixed concrete to hardened concrete. 

Type VI—For bonding and sealing segmental precast
elements, as in segment-by-segment erection, and for span-by span erection when temporary post tensioning is applied.

Type VII—For use as a nonstress carrying sealer for
segmental precast elements when temporary post tensioning is
not applied as in span-by-span erection.

Grades—Three grades of systems are defined according
to their flow characteristics and are distinguished by the
viscosity and consistency requirements of Table 1. 

 Grade 1—Low viscosity. 
 Grade 2—Medium viscosity. 
 Grade 3—Non-sagging consistency.

Classes—Classes A, B, and C are defined for Types I
through V, and Classes D, E, and F are defined for Types VI
and VII, in accordance with the range of temperatures for
which they are suitable (Note 2). 

Class A—For use below 4°C [40°F] the lowest allowable temperature to be defined by the manufacturer of the
product.

Class B—For use between 4 and 15°C [40 and 60°F]. 

Class C—For use above 15°C [60°F] the highest
allowable temperature to be defined by the manufacturer of the
product.

Class D—For use between 4 and 18°C [40 and 65°F]
for Type VI and VII applications.

Class E—For use between 15 and 30°C [60 and 80°F]
for Type VI and VII applications.

Class F—For use above 25°C [75°F] for Type VI and
VII applications, the highest allowable temperature to be
defined by the manufacturer of the product.

ASTM C 881 free standard downloads 
Enter you comment in comment box