Development of corrosion of steel bars embedded in mortar made with slag from secondary metallurgy

The aim of this work is to study the evolution of the corrosion rate of reinforcements embedded in mortar specimens that have been partly or fully replaced by the sand ladle furnace white slag. Prisms are manufactured mortar 6cm x 8cm x 2cm in which are embedded reinforcing steel bars of 6mm diameter B500SD. At the time of mixing were added varying amounts of chloride ion content by weight of cement (0%, 0.4%, 0.8%, 1.2%, 2%). The specimens were made totally or partially replacing the white slag, getting four different mixes depending on the degree of substitution. After curing the specimens for 28 days in moist chambers proceeded to dry up naturally. Here are gradually dampened by its conservation in a moist chamber, periodically measuring the corrosion rate of the bars using the technique of polarization curve. The results, in terms of corrosion current and corrosion potential, were compared with those obtained on standard samples, without replacement by slag aggregate. The analysis of results allows us to know, depending on the type of mortar used, the chloride threshold with the depassivation produced steel and the corrosion rates achieved in steels in the active state in terms of mortar moisture, obtained from qualitatively using gravimetric techniques. The results achieved to date support the conclusion that no significant differences in the behavior against corrosion induced by chloride ions, between the steel bars embedded in standard samples and the steel bars embedded in samples including with aggregates from slag. Both the chloride threshold resulting in the depassivation steel as the corrosion rate reached through the bars in an active state are very similar in both types of mortars when they have the same moisture content.

Durability and compressive strength of blast furnace slag-based cement grout for special geotechnical applications

Special foundations, most prominently micropiles and soil anchors, are frequently used in construction today. In Spain, the grout for these special technical applications is generally prepared with portland cement, although the codes and standards in place stipulate only the minimum compressive strength required, with no mention of cement type. Those texts also establish a range of acceptable water:cement ratios. In the present study, durability and compressive strength in cement grout prepared with blast furnace slag cement at different w/c ratios are characterised and compared to the findings for a reference portland cement grout. The results show that slag grout exhibits greater durability than the portland cement material and complies with the compressive strength requirements laid down in the respective codes.

Handbook of narrow-gauge equipment, 60-centimeter, for 12-inch mortar railway mount, model 1918. April 23, 1919.

At head of title: Form 2025.

A practical treatise on soluble or water glass, silicates of soda and potash, for silicifying stones, mortar, concrete, and hydraulic lime ...

Mode of access: Internet.

Stem design and shotcrete, grout, and concrete support /

Project pre-SCHOONER.

Concrete, grout, and shotcrete support, and design and postshot evaluation of stem /

Project pre-DUGOUT.

Effect of mortar properties on strength of masonry /

"Issued November 20, 1961."

Unit maintenance : carrier, personnel, full tracked, armored, M113A2, 2350-01-068-4077; carrier, command post, light tracked, M577A2, 2350-01-068-4089; carrier, mortar, 107-mm, M30, self-propelled, M106A2, 2350-01-069-6931; carrier, mortar, 81-mm, M29A1, self-propelled, M125A2, 2350-01-068-4087; chassis, gun, anti-aircraft artillery ... carrier, smoke generator, full tracked ... combat vehicle, anti-tank ....

"July 1990--[Vol. 2].

Direct support maintenance manual for mortar, 4.2-inch, M30 (Cannon M30 on Mount M24A1), (1015-00-840-1840) and Trainer, Subcaliber, 60-mm, M31 (8429878).

Includes index.

Direct support maintenance repair parts and special tools list (including depot maintenance repair parts) for mortar, 4.2-inch, M30 (cannon M30 on mount M24A1) (1015-00-840-1840) and trainer, subcaliber, 60-mm, M31 (8429878).

Includes index.

Operator's manual for mortar, 81-mm, M29A1, (1015-00-999-7794).

Includes index.

Operator's manual for 4.2-inch mortar, M30 (1015-00-840-1840).

"March 1985."

Field maintenance : 60-mm mortars M2 and M19, 60-mm mortar mount M5, 60-mm mortar baseplate M1, 81-mm mortars M1 and M29, and 81-mm mortar and mounts M4, M23A1, M23A2, and M23A3.

Includes index.

Subcaliber mortar trainer M32 with 25-mm training projectile M379.

"September 1960."

Operator's manual : carrier, personnel, full tracked, armored M113A1, 2350-00-968-6321; carrier, command post, light, tracked M577A1, 2350-00-056-6808; carrier, mortar, 107-mm, self-propelled M106A1, 2350-00-076-9002; carrier, mortar ... carrier, flame thrower ....

"August 1978."