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International Concrete Abstracts Portal

Showing 1-5 of 6 Abstracts search results

Document: 

23-330

Date: 

September 1, 2024

Author(s):

Peiyuan Chen, Chunning Pei, Liheng Zhang, Shangkun Li, and Jialai Wang

Publication:

Materials Journal

Volume:

121

Issue:

5

Abstract:

The applications of alkali-activated slag (AAS) face challenges such as poor workability, rapid setting, and high autogenous shrinkage, which require chemical admixtures (CAs) to adjust the performance of AAS. Unfortunately, there are limited specific CAs available to tune AAS properties. To address this gap, this study proposes using a ubiquitous, naturally occurring compound, L-ascorbic acid (LAA), as a multifunctional performanceenhancing additive for AAS to overcome the major challenges of AAS. The findings showed that LAA can function as a retarder, plasticizer, strength enhancer, and autogenous shrinkage reducer for AAS. When 0.5% LAA was added, the compressive strengths of AAS mortars at 3 and 28 days increased by 28.9% and 19.6%, respectively, and the 28-day autogenous shrinkage decreased by 43.1%. Both surface adsorption and ion complexation have been confirmed as the working mechanisms of LAA in hydrated AAS.

DOI:

10.14359/51742041

Document: 

15-330

Date: 

May 1, 2017

Author(s):

A. Muthadhi and V. Dhivya

Publication:

Materials Journal

Volume:

114

Issue:

3

Abstract:

To address the environmental constraints due to cement production and sand scarcity, strength properties of high-calcium fly ash (CFA)-based geopolymer concrete with quarry dust as fine aggregate is explored in this paper. River sand was replaced with quarry dust from 0 to 100% by mass. Sodium hydroxide solution with 8M and 14M concentration, alkaline liquid-to-fly ash ratios of 0.50 and 0.60, and three curing regimes—oven curing, ambient curing, and external exposure curing—were used. The results indicated that geopolymer concrete achieved comparably equal strength to that of the reference concrete mixture at a 100% quarry dust level. External exposure and ambient curing can be practiced to attain comparable strength properties of geopolymer concrete with quarry dust as fine aggregate. Experimental values of split tensile strength of geopolymer concrete with quarry dust follows good relations with various empirical equations.

DOI:

10.14359/51689674

Document: 

12-406

Date: 

September 1, 2014

Author(s):

Lesley H. Sneed, Tommaso D’Antino, and Christian Carloni

Publication:

Materials Journal

Volume:

111

Issue:

5

Abstract:

This paper presents the results of an experimental study conducted to understand the behavior and stress-transfer mechanism of fiber-reinforced cementitious matrix (FRCM) composites externally bonded to a concrete substrate for strengthening applications. The FRCM composite was comprised of a polyparaphenylene benzobisoxazole (PBO) fiber net embedded within two layers of polymer-modified cement-based mortar. Single-lap shear tests were conducted on specimens with composite strips bonded to concrete prisms. Parameters that varied were bonded length and width of composite. Additionally, the external coating layer of matrix was omitted on a limited number of specimens to examine the interfacial behavior between fibers and matrix and the role of the matrix in the stress transfer. Strain measurements along the composite bonded length were used to investigate the stress-transfer mechanism. Results suggest that the effective bond length of this composite is within the range of 250 to 330 mm (10 to 13 in.). Unlike with fiber-reinforced polymer (FRP) composites, no width effect was observed in terms of the maximum load. Finally, the stress-transfer mechanism at the matrix-fiber interfaces on either side of the fiber net was found to be unequal.

DOI:

10.14359/51686604

Document: 

94-M25

Date: 

May 1, 1997

Author(s):

Jian Ding, Yan Fu, and J. J. Beaudoin

Publication:

Materials Journal

Volume:

94

Issue:

3

Abstract:

Hydration and strength development characteristics of high-alumina cement (HAC) containing sodium sulfate and a variety of different zeolites were studied. The zeolites obtained from different sources included different types containing clinoptilolite, chabazite, stilbite, and natrolite. The one-day compressive strength of HAC mortars containing a commercially available zeolite and sodium sulfate was as high as 60 MPa. No strength reduction occurred in the HAC mortars water-cured at 38 C for 330 days. Hydrogarnet formation was significantly inhibited. Clinoptilolite or chabazite-based zeolites in combination with sodium sulfate were more effective in preventing the formation of hydrogarnet in HAC paste than stilbite or natrolite-based zeolites. Zeolite alone was not able to prevent the hydrogarnet formation in the HAC paste. Chabazite was the most effective zeolite in promoting str tlingite formation in the HAC paste.

DOI:

10.14359/302

Document: 

90-M41

Date: 

July 1, 1993

Author(s):

ACI Committee 330

Publication:

Materials Journal

Volume:

90

Issue:

4

Abstract:

This standard covers minimum requirements for the construction of plain concrete parking lots on grade. Included are requirements for materials, placing, texturing, curing, jointing, and opening to traffic.

DOI:

10.14359/3898

12

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