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Showing 1-5 of 22 Abstracts search results

Document: 

SP354

Date: 

July 1, 2022

Author(s):

Sponsored by: ACI Committees 212, 236, 238, and 239

Publication:

Symposium Papers

Volume:

354

Abstract:

In May 1978, the Canada Centre for Mineral and Energy Technology (CANMET), in association with the American Concrete Institute (ACI) sponsored a 3-day conference in Ottawa, ON, Canada, on the use of superplasticizers in concrete. Selected papers from the conference were published as ACI SP-62. In 1981, CANMET, again in association with ACI, sponsored a second 3-day international conference in Ottawa on the use of the superplasticizers in concrete. Proceedings of the conference were published as ACI SP-68. The purpose of the third international conference in Ottawa in 1989 was to review the progress made since the meetings in 1978 and 1981, and to bring together representatives of the chemical admixtures, cement, and concrete industries to exchange information and delineate new areas of needed research. The scope of this conference was expanded to include chemical admixtures other than superplasticizers. Proceedings of the conference were published as ACI SP-119. In October 1994, CANMET in association with ACI and several other organizations sponsored the fourth conference in Montreal, QC, Canada. The objective of this conference was to bring attention to new developments in chemical admixture since the last conference in 1989. The proceedings of the conference were published as ACI SP-148. In October 1997, the Committee for the Organization of CANMET/ACI International Conference, (ACI Council), in association with ACI and several cement and concrete organizations in Italy, sponsored the fifth conference in Rome, Italy. The conference was aimed at transferring technology in the fast-moving field of chemical admixtures. The proceedings of the conference were published as ACI SP-173. In October 2000, Committee for the Organization of CANMET/ACI International Conferences, (ACI Council), in association with several organizations in Canada and France, sponsored the sixth conference in Nice, France. More than 50 papers from more than 20 countries were received and reviewed by an ACI review panel, and 37 were accepted for publication in the proceedings of the conference. The proceedings were published as ACI SP-195. In October 2003, the Committee for the Organization of CANMET/ACI International Conferences (ACI Council) in association with several organizations in Canada and Germany, sponsored the seventh conference in Berlin, Germany. The conference attracted more than 275 delegates and proceedings of the conference consisting of 39 papers, were published as ACI SP-217. In October 2006, the Committee for the Organization of CANMET/ACI International Conferences, (ACI Council), sponsored the eighth conference in Sorrento, Italy. More than 60 papers from more than 25 countries were received, and peer reviewed by the CANMET/ACI review panel in Budapest, and 36 were accepted for publication as ACI SP-239. In October 2009, the Committee for the Organization of International Conferences (COIC) (formerly CANMET/ACI International Conferences) sponsored the ninth ACI International Conference in Seville, Spain. More than 50 papers from more than 20 countries were received and peer reviewed, and 35 were accepted for publication in the proceedings of the conference. The proceedings were published as ACI SP-262. In October 2012, COIC sponsored the Tenth International Conference on Superplasticizers and Other Chemical Admixtures in Concrete in Prague, Czech Republic. More than 70 papers from all over the world were peer reviewed, and 33 were accepted for publication in the proceedings of the conference. The proceedings were published as ACI SP-288. In July, 2015, the COIC in association with ACI sponsored the Eleventh International Conference on Superplasticizers and Other Chemical Admixtures in concrete in Ottawa, ON, Canada. More than 60 papers from the world over were peer reviewed, and 28 were accepted for publication in the proceedings of the conference. Also, additional papers were presented at the conference that were published in the Supplementary Papers Volume. In October 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 as ACI SP-329. The proceedings were published as ACI SP-302. Also, 54 additional papers were presented at the conference, and were published in the Supplementary Papers Volume. In July, 2022, after a postponement for the COVID-19 pandemic, the ACI Italy Chapter and the University of Bergamo, Italy, sponsored the Thirteenth International Conference on Superplasticizers and Other Chemical Admixtures in Concrete in Milan, Italy. The proceedings of the conference consisting of 35 refereed papers were published by ACI as SP-354. In addition to the refereed papers, about 20 other papers were presented at the conference, and were published in a supplementary papers volume. The main topics of the papers presented at the conference are related to superplasticizers, accelerating admixtures, retarding admixtures, air-entraining agents, shrinkage-reducing agents, superabsorbent polymers, and self-healing admixtures, and their influence on the properties of the concrete in fresh and hardened state. These properties include: workability, slump-loss, time of setting, heat of hydration, strength, durability, shrinkage, and creep of the concrete mixtures. Thanks are extended to the reviewers for the valuable efforts in reviewing all the manuscripts published in the conference proceedings and in the supplementary volume. The guidance from Dr. V. M. Malhotra and Prof. M. Collepardi, the Honorary Chairpersons of the conference, is sincerely appreciated. Also, acknowledged is the support of ACI International for the publication of the proceedings (ACI SP-354). The Editors Dr. Denny Coffetti Prof. Luigi Coppola Dr. Terence Holland

DOI:

10.14359/51736102


Document: 

SP-355_25

Date: 

July 1, 2022

Author(s):

Oğulcan Canbek, Francesca Lolli, Christopher M. Childs, Newell R. Washburn, Kimberly E. Kurtis

Publication:

Symposium Papers

Volume:

355

Abstract:

The global warming potential (GWP) of limestone calcined clay cements (LC3) is mainly affected by the production of Portland cement (PC) and calcined clay, and by the transportation of the raw materials. However, the relative contributions of varying proportions and particle sizes of constituent materials to LC3 sustainability have not been studied extensively, particularly in the context of their influence on other properties like strength development. In this research, a quantitative multi-objective design tool that can predict the LC3’s GWP and compressive strength development was developed. The model was supported by experimental results from 18 LC3 compositions with varying proportions of PC:MK:LS and limestone (LS) particle sizes, and a “cradle-to-gate” life cycle assessment (LCA) to quantify the GWP. Key findings include: (1) the nucleation effect by fine (D50 = 3 μm) limestone is pronounced and increases early (3-D) strength but only if limestone proportion is higher than that of metakaolin (MK), and (2) MK:LS affects both the 3-D strength and the GWP, while PC content is the main determinant for long-term strength gain. The multi-objective optimization results suggest that strength and sustainability improvements for LC3 can be realized by optimizing the limestone particle sizes and the PC:MK:LS.

DOI:

10.14359/51736035


Document: 

SP-330-17

Date: 

September 26, 2018

Author(s):

Dongmin Wang and Dawang Zhang

Publication:

Symposium Papers

Volume:

330

Abstract:

This work aims to investigate the buildability of geopolymer printing materials with silicon-to-aluminum (Si/Al) from 4.5-5.5 were prepared by addition different content of steel slag into printing materials matrix. Effects of Si/Al on the buildability of geopolymer printing were investigated by open time and rheology of fresh pastes. The results show that Si/Al ratios cause the change of buildability. Higher Si/Al of geopolymer printing materials is beneficial to buildability: longer open time, lower plastic viscosity, higher yield stress, and great thixotropic guaranteed the continuity and stability of structure in the printing system.

DOI:

10.14359/51711251


Document: 

SP-330-15

Date: 

September 26, 2018

Author(s):

Wen Zhou, Yongxiang Zhou, Peng Feng, Zuqi Wang, Jing Wang, and Putao Song

Publication:

Symposium Papers

Volume:

330

Abstract:

Preparing concrete with coral gravel and coral sand as aggregates is of great significance for the construction of offshore islands short of building materials. LC30 and LC50 coral aggregate concrete (CAC) using aggregate from South China Sea were prepared and basic properties of CAC were studied and compared with ordinary concrete (OC) and lightweight aggregate concrete (LAC). The results show that prewetting aggregates improves the compressive strength of CAC with low water-cement ratio (w/c). With the same level of cube compressive strength (fcu), the compressive strength (fc) of CAC is higher than that of OC and LAC, the splitting tensile strength (fsp) of CAC is close to that of OC and higher than that of LAC, the elastic modulus (Ec) of CAC is between that of OC and LAC. Test results on durability properties show that 3-day shrinkage of CAC is 43% of OC; and CAC’s ability to resist chloride diffusion is inferior to OC but better than LAC.

DOI:

10.14359/51711249


Document: 

SP326-01

Date: 

August 10, 2018

Author(s):

N. Banthia, O. Onuaguluchi, and D. Cui

Publication:

Symposium Papers

Volume:

326

Abstract:

One very effective way of enhancing durability of concrete is by refining the microstructure using internal curing. This paper will describe some novel insights into providing internal curing in concrete using inexpensive and recycled engineered cellulose fiber (CF). Such bio-inspired materials also provide self-healing and reduce the continual need for repair and intervention. This study investigates the effect of 0 kWh/t, 100 kWh/t and 185 kWh/t degree of cellulose pulp refinement on fiber morphology, fiber water retention and desorption and fresh and hardened properties of cement composites containing these fibers as internal curing agents. 3-D Dual Scan Computer Tomography (CT) was also used to understand the refinement due to CF addition. It was concluded that CF addition resulted in a higher degree of hydration, pore refinement and interface densification. Results also show that CF can be further refined mechanical to increase the surface fibrillation and this may result in significant further improvement in the internal curing performance.

DOI:

10.14359/51710971


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