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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Shotcrete Test Center
Author(s): Espen A Rudberg and Thomas Beck
Publication: Special Publication
Appears on pages(s): 183-190
Keywords: shotcrete; test center; alkali free shotcrete accelerator; compression strength development; fresh concrete temperature; curing temperature
Abstract:Early compressive strength development in sprayed concrete is a crucial factor for success. A full scale mixing and spraying test have been done in Mapei’s Shotcrete Test Centre (STC) in Norway. Two identical batches of fresh concrete have been made, but with +13 °C (55.4 °F) and +28 °C (82.4 °F) fresh concrete temperature. Two sample boxes from each concrete batch have been sprayed with 9% alkali-free accelerator and have been stored in warm +20 °C (68 °F) and cold +5 °C (41 °F) conditions. A higher temperature in fresh concrete increased the compressive strength the first hour, while warmer conditions when curing had a stronger influence on the compressive strength at 6, 12 and 24 hour.
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