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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 20 Abstracts search results
Document:
SP330
Date:
October 2, 2018
Author(s):
Tongbo Sui, Terence C. Holland, Ziming Wang, Xiaolong Zhao
Publication:
Symposium Papers
Volume:
330
Abstract:
In October 30 to November 2, 2018, the CCS and the China Academy of Building Research (CABR), Beijing China, in association with the COIC sponsored the Fourteenth International Conference on Recent Advances in Concrete Technology and Sustainable Issues in Beijing, China. The proceedings of the Conference consisting of 19 refereed papers were published by the ACI as SP 330. In addition to the refereed papers, more than 52 papers were presented at the conference, and these were published in the supplementary papers volume.
DOI:
10.14359/51712248
SP-330-15
September 26, 2018
Wen Zhou, Yongxiang Zhou, Peng Feng, Zuqi Wang, Jing Wang, and Putao Song
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.
10.14359/51711249
SP-330-17
Dongmin Wang and Dawang Zhang
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.
10.14359/51711251
SP-330-16
J. Fernando Martirena, Eilys Valdes, Adrian Alujas, and Karen Scrivener
This paper presents the results of the work to develop a mineral addition produced with a blend of 60% of calcined clay of kaolinitic origin, 30% of limestone and 10% of gypsum, to be added as Supplementary Cementitious Material directly while mixing concrete. The clay used has a kaolinite content within 40-50%, and has been activated at 800°C. The three components have been interground at a ball mill. The influence of the addition on cement hydration has been studied aided by Isothermal calorimetry of cement pastes having mineral additions of 35% and 50% per weight. Concrete with the minimum cement content required for the most aggressive exposure class (350 kg/m3) has been cast and mineral additions of 17% and 34% per weight have been made. Concrete strength went above 45 MPa, despite having the minimum cement content.
10.14359/51711250
SP-330-02
Zhenping Sun, Chao Chen, Yanliang Ji, Xu Yang, Yuansong Sun, and Lelin Wu
The objective of this study was to evaluate the influence of alkalinity on the properties and acceleration mechanism of the accelerated cement pastes. Properties of cement pastes relating to its setting time and the strength development as well as its hydration behavior were experimentally tested. XRD and SEM analysis were also performed on the cement pastes to identify the hydration products and their structures. Results showed that with the increase of alkalinity, the hydration rate and the early compressive strength of cement paste with both alkaline and alkali–free accelerators were accelerated and the setting time was shortened. However, it is harmful for the long-term compressive strength. XRD analysis disclosed the existence of more ettringite with the increase of the alkalinity. However, it appeared no difference between the formation of the ettringite in the cement paste with different alkalinity.
The objective of this study was to evaluate the influence of alkalinity on the properties and acceleration mechanism of the accelerated cement pastes. Properties of cement pastes relating to its setting time and the strength development as well as its hydration behavior were experimentally tested. XRD and SEM analysis were also performed on the cement pastes to identify the hydration products and their structures.
Results showed that with the increase of alkalinity, the hydration rate and the early compressive strength of cement paste with both alkaline and alkali–free accelerators were accelerated and the setting time was shortened. However, it is harmful for the long-term compressive strength. XRD analysis disclosed the existence of more ettringite with the increase of the alkalinity. However, it appeared no difference between the formation of the ettringite in the cement paste with different alkalinity.
10.14359/51711236
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