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Old - New concrete joints construction chemicals
There are two types of bonding agents are available for joining old to new concrete joint 

1. Latex bonding agents 
Modified Styrene butadiene (SBR) latex rubber emulsion which is supplied as a ready to use white liquid. It is designed to improve the qualities of site-batched cementitious mortars and slurries. Being resistant to hydrolysis, it is ideal for internal and external applications in conjunction with cement for example Fosroc Nitobond SBR , Dr. Fixit Super Latex etc. 

2. Epoxy Bonding Agents
Various epoxy products are available for the bonding of freshly placed concrete to cured concrete and of concrete to steel. Most products contain resins that are 100% solids 
for example Dr. Fixit Epoxy Bonding Agent , Fosroc Nitobond EP Std etc. 

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