gypsum slag cement grout (US)

In the article studies of oil-filled compositions with the addition of blast-furnace slag for strength at elevated temperatures are presented. The rheological parameters of the slag cement slag cement mortar, as well as the setting time, were studied. Conclusions are drawn about the prospects of further study of slag cementcontaining compositions.

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Formation of Iron Sulfides on Carbon Steel in a Specific Cement Grout Designed for Radioactive Waste Repository and Associated Corrosion Mechanisms

Materials ◽

10.3390/ma14133563 ◽

2021 ◽

Vol 14 (13) ◽

pp. 3563

Author(s):

Mathieu Robineau ◽

Valérie Deydier ◽

Didier Crusset ◽

Alexandre Bellefleur ◽

Delphine Neff ◽

...

Keyword(s):

Carbon Steel ◽

Radioactive Waste ◽

Corrosion Product ◽

Product Layer ◽

Cement Grout ◽

Radioactive Waste Disposal ◽

Sulfide Concentration ◽

Iron Sulfides ◽

Corrosion Mechanisms ◽

A Minor

Carbon steel coupons were buried in a specific low-pH cement grout designed for radioactive waste disposal and left 6 months in anoxic conditions at 80 °C. The corrosion product layers were analyzed by µ-Raman spectroscopy, XRD, and SEM. They proved to be mainly composed of iron sulfides, with magnetite as a minor phase, mixed with components of the grout. Average corrosion rates were estimated by weight loss measurements between 3 and 6 µm yr−1. Corrosion profiles revealed local degradations with a depth up to 10 µm. It is assumed that the heterogeneity of the corrosion product layer, mainly composed of conductive compounds (FeS, Fe3S4, and Fe3O4), promotes the persistence of corrosion cells that may lead to locally aggravated degradations of the metal. New cement grouts, characterized by a slightly higher pH and a lower sulfide concentration, should then be designed for the considered application.

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Laboratory Investigation of Pavement Backfilling Materials for Micro-Trenching in Cold Regions

Transportation Research Record Journal of the Transportation Research Board ◽

10.1177/0361198118784172 ◽

2018 ◽

Vol 2672 (12) ◽

pp. 62-71

Author(s):

Leila Hashemian ◽

Vinicius Afonso Velasco Rios ◽

Alireza Bayat

Keyword(s):

Laboratory Investigation ◽

Dynamic Modulus ◽

Laboratory Tests ◽

Hot Mix Asphalt ◽

Cement Grout ◽

Host Material ◽

High Quality ◽

Cold Temperatures ◽

Asphalt Mixes ◽

Freeze Thaw

This study investigated the performance of different materials in a micro-trench composite backfilling design. Laboratory tests were conducted to evaluate the effect of cold temperatures and freeze/thaw cycles on a cement grout and seven preparatory cold asphalt mixes. To compare the performance of cold mix asphalt and epoxy grout with hot mix asphalt as the host material, rutting tests and dynamic modulus tests at different loading frequencies and temperatures were conducted. Finally, laboratory scale micro-trench samples were prepared using different backfilling materials and were loaded using a wheel tracker after freeze/thaw conditioning. The results showed that cement grout could effectively be used to secure the conduit inside the trench. It was also concluded that using high-quality cold mix asphalt, a compatible material with hot mix asphalt, could improve micro-trench durability compared with epoxy grout.

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