In today’s market, it is imperative to be knowledgeable and have an edge over the competition. ACI members have it…they are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them.
Read more about membership
Become an ACI Member
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.
American Concrete Institute
38800 Country Club Dr.
Farmington Hills, MI
Chat with Us Online Now
Feedback via Email
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: Reproduction of Ancient Cementitious Material Used in China 5000 Years Ago
Author(s): K. Asaga, M. Daimon, Z. X. Li, and K. Yokozeki
Publication: Special Publication
Appears on pages(s): 123-138
Keywords: cementitious; concrete; hydraulic cement; materials
Abstract:In China, ancient concrete was excavated in which a hydraulic type of cement resembling modern cement was supposed to have been used. This paper gives first, detailed characterization on the raw stone of this ancient cement both from chemical and mineralogical point of view. Also, an attempt has been made to reproduce the ancient cementitious material by burning the raw stone. The change in the hydration products and mechanical properties of hardened specimen were pursued during a hydration test, and the results can be summarized as follows. l The raw stone bears a striking resemblance in chemical composition to the modern ordinary Portland cement (as recalculated in the de-carbonated form). l Small crystal size silicious species such as quartz, clay, mica and feldspar were well dispersed in the texture of the raw stone. l B -Ca,SiO, was observed in the burned stone at 1000°C. l An increase in hydration products( CSH and Ca(OH) 2 ) were observed with progress of hydration. l The hydrated paste specimen showed a compressive strength of 10 MPa at 28 days with a w/c of 0.60.
Click here to become an online Journal subscriber