Patent · US Expired

Easy-working spray concrete

US4772327A · kind A · utility

8Cited by

7References

6Claims

0Family size

Assignee

Dynamit Nobel GmbH · DE

Inventors

Kurt Allemann · Davos, CH
Klaus Deneke
Hansjurgen Hass · Troisdorf, DE
Gunter Vogel · Speyer, DE

Key dates

Filing date	Oct 24, 1985
Grant date	Sep 20, 1988
Priority date	—
Expiry date	Oct 24, 2005

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02W30/91
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

Disclosed is a spray concrete which, even at a water-cement ratio of 0.45 to 0.55, is still easy to work, can be sprayed well, and sets and hardens rapidly. It contains, in addition to the conventional additives, additions of naphthalinesulfonicacid-formaldehyde condensation products and highly concentrated alkaline aqueous solutions of potassium aluminate, potassium carbonate and caustic potash. The concrete according to the invention displays an especially rapid solidification when it contains up to 3% by weight alkali silicates or an adequate amount in highly dispersed silicic acid (SiO.sub.2). The additives are incorporated into the concrete preferably directly at the worksite prior to spraying.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.