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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.
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-329-10
Ying Qiu, Guo-Xin Chen, Ye-Ran Zhu, Xiu-Sheng Tang, and Zheng Cui
A high-performance liquid alkali-free setting accelerator (HSL) in sprayed concrete was prepared by dimethyl sulfoxide modified sepiolite and aluminum hydroxide as the main raw materials. The sprayed concrete rebound have been investigated by concrete penetration resistance tester. Its set accelerating mechanism is studied by pore structure analysis,XRD characterization methods. The pore structure analysis shows that the total porosity and pores larger than 3.94 in. [100 mm] of cement pastes mixed with HSL are slightly reduced after 28 days hydration and the hydration of C3A was accelerated by the polyamine complexation of accelerator, resulting in forming a large number of acicular ettringite and reducing the amount of Ca(OH)2 crystal, which will not affect the later hydration of cement,to improve the final compressive strength. The 1day compressive strength of the concrete mixed with HSL reaches 22.3 MPa (3234 psi), the 28 days compressive strength ratio increasing by 118.5%.
10.14359/51711208
SP-329-26
Hongxia Zhao, Yanwei Wang, Yong Yang, Xin Shu, Jiaping Liu, and Qianping Ran
Computational simulations have become a powerful tool to investigate the conformational properties of polycarboxylate superplasticizers in solution and at liquid-solid interfaces. Those properties are difficult to measure experimentally. Our group has recently carried out some studies on conformation using the all-atom model to explore the effects of counter-ion species and concentration, solution pH, content of methyl groups, and hydrophobic modifications on polymer properties. Such studies were driven by the experimental work carried out in our group during the course of product development, and have in return provided useful information for an improved understanding of experimental phenomena. In this work, we discuss the conformation properties of superplasticizers performed by all-atom molecular dynamics simulations and the correlation of the microscopic conformation with the experimental phenomena.
10.14359/51711224
SP-329-25
Yanwei Wang, Xin Shu, Yong Yang, Qianping Ran, and Jiaping Liu
Conformational properties of comb-shaped copolymer polyelectrolytes such as polycarboxylate ether-based superplasticizers (PCEs) in aqueous solutions and at liquid/solid interfaces are fundamental to their performances as polymeric dispersants. Pioneering studies of Flatt and coworkers have demonstrated the great relevance of polymer theory to the PCE community. The present work revisits this topic with an emphasis on the semi-flexible characteristics of the anionic backbone decorated with flexible side chains. A simple physical picture, where the backbone adopts a "train-like" conformation on the surface, effectively as a two-dimensional worm-like chain, with the side chains mimicking surface-tethered chains, is presented for PCEs in the strongly adsorbed state.
10.14359/51711223
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