Formwork Rust Ithaca NY

Steel formwork is used in prefabrication operations because of its robustness and reusability, as well as its ability to produce prefabricated units with smooth surfaces. On these steel molds, brownish-reddish rust spots sometimes form while the concrete hardens. This rust could lead to brown or red spotty discolorations on the concrete surface lower the concrete element's appearance, Fig. 1 .

Local Companies

Fastenal- Ithaca
607-277-8379
229 Cherry St Ithaca, NY, 14850
Ithaca, NY
Valu Home Center #43
607-756-6007
1122 Rt 222
Cortland, NY
Alpine Building Supply
315-497-1221
Route 38
Moravia, NY
Moravia True Value Hardware
(315) 497-1966
102 Main St
Moravia, NY
Cayuga True Value Lumber
(607) 273-0245
801 W State St
Ithaca, NY
Lowe's
(607) 254-2000
130 Fairgrounds Memorial Parkway
Ithaca, NY
Builders Best Do it center
607-756-7871
3798 Luker Road
Cortland, NY
Ag Trac Llc
315-497-1650
1044 State Route 34
Genoa, NY
Stover Lumber Inc.
607-387-3188
1974 Trumansburg
Jacksonville, NY
Ithaca Agway & True Value
(607) 272-1848
213 S Fulton St
Ithaca, NY

Source: CONCRETE PRODUCER MAGAZINE
Publication date: May 1, 2007

By Peter Boos and Reiner Haerdtl

Introduction

Steel formwork is used in prefabrication operations because of its robustness and reusability, as well as its ability to produce prefabricated units with smooth surfaces. On these steel molds, brownish-reddish rust spots sometimes form while the concrete hardens. This rust could lead to brown or red spotty discolorations on the concrete surface lower the concrete element's appearance, Fig. 1 . Removing these discolorations by sanding and resurfacing is costly and time-consuming.

Reasons for corrosion

There are several reasons for metal corrosion, and thus different forms: contact corrosion, crack corrosion, inter-crystalline corrosion, pitting corrosion, etc. The corrosion of iron and/or steel is an electrochemical process in the presence of water and oxygen. Metal corrosion occurs at the spot with the higher electro-negative potential. Here, the metal ions dissolve from the surface into the solution and when they collide with hydroxide ions they precipitate as iron hydroxide.

The resulting iron minerals are formed, depending on temperature and air humidity. Due to constant recrystallization, no permanent protective rust layer is formed on the surface that would prevent further corrosion.

Click here to read full article from The Concrete Producer

Related Article
- Hand Tools Ithaca NY
The Sonic Tape, a distance-measuring device from AGL Lasersource can be used to determine length, width, and height and to compute area and volume. The tool has a range from 2 feet to 50 feet and an accuracy of 99.5 percent.