Email Address is required Invalid Email Address
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
Learn More
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.
Staff Directory
ACI World Headquarters 38800 Country Club Dr. Farmington Hills, MI 48331-3439 USA Phone: 1.248.848.3800 Fax: 1.248.848.3701
ACI Middle East Regional Office Second Floor, Office #207 The Offices 2 Building, One Central Dubai World Trade Center Complex Dubai, UAE Phone: +971.4.516.3208 & 3209
ACI Resource Center Southern California Midwest Mid Atlantic
Feedback via Email Phone: 1.248.848.3800
ACI Global Home Middle East Region Portal Western Europe Region Portal
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.
Showing 1-5 of 37 Abstracts search results
Document:
SP329
Date:
October 2, 2018
Author(s):
Jiaping Liu, Ziming Wang, Terence C. Holland, Jing Huang, Johann Plank
Publication:
Symposium Papers
Volume:
329
Abstract:
On October 28-31, 2018, the Chinese Ceramic Society and the China Academy of Building Research (CABR), Beijing China, in association with ACI, sponsored the Twelfth International Conference on Superplasticizers and other Chemical Admixtures in Concrete in Beijing China. More than 80 papers from all over the world were received and peer reviewed. A total of 36 refereed papers were accepted for publication in the proceedings of the conference. The proceedings were published by the ACI as SP 329. Also, 54 additional papers were presented at the conference, and were published in the Supplementary Papers Volume. The organizers of the conference were the Chinese Ceramic Society, Beijing and the Committee for the Organization of International Conferences (formerly CANMET/ACI Conferences).
DOI:
10.14359/51712247
SP-329-30
September 26, 2018
Luigi Coppola, Denny Coffetti, and Elena Crotti
The article deals with the evaluation of the effect of a tartaric acid-based set retarding admixture on the properties of environmentally friendly mortars manufactured with CSA, anhydrite, hydrated lime and supplementary cementitious materials (fly ash, metakaolin and slag cement). Results indicated that the tartaric acid, acts as superplasticizer and it is effective to extend the pot-life of mortars up to about 2 hours. On the other hand, the set-retarding admixture determines a strong retardation of binder hydration and, consequently, a reduction of compressive strength at early ages. Mortars without tartaric acid showed an initial expansion during the first 5-7 days as a consequence of ettringite formation than mixtures shrink. When set-retarding admixture is used, the initial free-expansion totally disappears and shrinkage begins immediately after final set has occurred. However, after 270 days shrinkage is substantially the same for mortars with and without tartaric acid.
10.14359/51711228
SP-329-29
Jinming Wang, Kaiyu Wang, Yongwei Wang, Yongsheng Liu, and Jie Zhang
Ordinary cementitious grout for sleeve coupler of reinforcement splicing cannot be applied normally when the temperature is below 5oC. In this paper, a new type of sleeve cementitious grout with sulphoaluminate cement as the main binding material used in the negative temperature is developed. Besides, the effects of polycarboxylate water-reducing agents, thixotropic agents, superfine beads, plastic expansion agents and antifreeze components on the performance of grouting materials are also studied. The results show that the sleeve cementitious grout studied has good rheological properties and strong ability to resist frost. The compressive strength can still develop even in the environment of -10 oC, and there is no special construction technology required. This reduces significantly the difficulty of the construction of prefabricated building connection in low temperature environment.
10.14359/51711227
SP-329-36
Josephine Cheung, Elizabeth Burns, Joshua Curto, and Nathan Tregger
The production of sustainable building materials, such as concrete, has drawn increasing attention in the last decade. Breakthroughs in the development of new admixtures, optimized mix designs, innovative concrete management systems, together with a deeper understanding of the best-mode usage of admixtures with different cementitious materials have resulted in the production of sustainable concrete with better performance at a lower cost. This paper presents three approaches for producing sustainable concrete: (1) introduction of a new class of admixture systems that produce control flow concrete or concrete with flow characteristics of self-consolidating concrete (SCC) without using high cement content, (2) minimization of polycarboxylate ether/ester (PCE) and cement usage through better understanding of the interaction between PCEs and sulfates and (3) use of in-transit concrete management systems (iCMS) to consistently deliver concrete that will meet desired specifications with minimal over-design.
10.14359/51711234
SP-329-17
Harald Justnes
Other compounds than gypsum to regulate the setting of Portland cement clinker have been investigated. This will potentially improve particle packing of such a cement since elongated ettringite needles should NOT form on the surface of the cement grains in the fresh state as with gypsum as set regulator. It has been demonstrated that small dosages of citric acid (0.2%), lignosulphonate (0.3%) and tannic acid (0.05%) can be viable alternative set regulating admixtures to 3.5% gypsum in Portland cement clinker. It has been proven for paste specimen cured for 90 days that the porosity of clinker paste with w/c = 0.45 using 0.05% tannic acid has more than 20% reduced porosity compared to paste made with the normal 3.5% gypsum dosage of clinker mass at the same w/c. In addition to reduced total porosity, the pore openings were also finer.
Other compounds than gypsum to regulate the setting of Portland cement clinker have been investigated. This will potentially improve particle packing of such a cement since elongated ettringite needles should NOT form on the surface of the cement grains in the fresh state as with gypsum as set regulator.
It has been demonstrated that small dosages of citric acid (0.2%), lignosulphonate (0.3%) and tannic acid (0.05%) can be viable alternative set regulating admixtures to 3.5% gypsum in Portland cement clinker.
It has been proven for paste specimen cured for 90 days that the porosity of clinker paste with w/c = 0.45 using 0.05% tannic acid has more than 20% reduced porosity compared to paste made with the normal 3.5% gypsum dosage of clinker mass at the same w/c. In addition to reduced total porosity, the pore openings were also finer.
10.14359/51711215
Results Per Page 5 10 15 20 25 50 100