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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 21 Abstracts search results
Document:
23-257
Date:
August 1, 2024
Author(s):
Leigh E. W. Ayers and Isaac L. Howard
Publication:
Materials Journal
Volume:
121
Issue:
4
Abstract:
In this paper, several hundred specimens were compacted and tested to evaluate the potential of beam testing protocols to directly measure four mechanical properties from one beam. Mechanical properties measured through beam testing protocols were compared to properties of plastic mold (PM) device specimens and were found to be comparable once specimen densities were corrected. Mechanical properties were also used to quantify mechanical property relationships, often used as pavement design inputs. When compared to traditionally recommended mechanical property relationships, relationships between elastic modulus and unconfined compressive strength, as well as modulus of rupture and unconfined compressive strength, were overly conservative; however, indirect tensile strength and unconfined compressive strength relationships from the literature were accurate. This paper also assessed an elevated-temperature curing protocol to simulate later-life pavement mechanical properties on laboratory specimens. Mechanical properties of laboratory specimens that underwent accelerated curing were shown to be comparable to 10- to 54-year-old cores taken from Mississippi highways.
DOI:
10.14359/51740780
21-409
September 1, 2022
A. S. Carey, L. A. Cooley Jr., A. Middleton, W. G. Sullivan, L. E. W. Ayers, and I. L. Howard
119
5
10.14359/51735957
19-193
March 1, 2020
Murat Mollamahmutoglu and Eyubhan Avcı
117
2
In this study, the goal was to investigate the shear strength properties of superfine cement (SC) stabilized clayey soil (CS). In this regard, standard compaction tests were run on the clayey soil specimens stabilized with 8, 10, and 12% SC to determine their optimum moisture contents and the maximum dry densities. Thereafter, unconsolidated undrained (UU) triaxial tests were conducted on them to find out their shear strength parameters and stress-strain characteristics at different time intervals under wet-cured and air-dried conditions. The shear strength parameters—namely the cohesion intercept and the internal friction angle of CS—increased with the stabilization of SC under both curing conditions. Additionally, the shear strength parameters of SC-stabilized CS were increased more with the increase of SC content and time under both curing conditions. The internal friction angles of air-dried specimens were higher than those of wet-cured specimens. On the other hand, the cohesion intercepts of wet-cured specimens were greater than those of air-dried specimens. The stress-strain behavior of CS was also influenced with the stabilization of SC such that as the stresses of CS were increased with the increase of SC content and time their strains decreased and they experienced brittle failures under both wet-cured and air-dried conditions.
10.14359/51722403
18-444
Wang Penghui, Qiao Hongxia, Feng Qiong, and Cao Hui
Because of ordinary reinforced concrete’s poor durability in saline soil areas and Qinghai Salt Lake, magnesium oxychloride-coated steel-cement concrete was adopted in this area. The process of the degradation of coated steel bars’ durability was evaluated according to the actual service situation of magnesium-oxychloridecoated reinforced concrete in saline soil areas and Qinghai Salt Lake. The corrosion parameters of coated steel bars in magnesium oxychloride cement concrete were obtained by the accelerated immersion and natural corrosion tests in a drying environment. Using the Copula function as the connection function, the corrosion current density of the coated steel obtained by accelerated tests and natural rust tests was adopted as the degradation factor of the edge distribution function. The results demonstrated that the Clayton-Copula function reflects the actual process of the degradation in durability of coated steel bars well, and the coated steel bars reached a severe state of corrosion at 18,250 days.
10.14359/51720298
17-367
November 1, 2018
115
6
In this paper, some geotechnical properties of low-plasticity clay blended with calcium aluminate cement (CAC) at different contents were investigated and compared with those of sulfate-resistant cement (SRC)-blended low-plasticity clay. As the liquid limits of CAC and SRC-blended low-plasticity clay decreased, their plastic limits increased. Additionally, the liquid limit and the plastic limit of CAC-blended low-plasticity clay were found to be lower than those of SRC-blended low-plasticity clay. The optimum moisture content and maximum dry density of low-plasticity clay were increased by both CAC and SRC agents. Moreover, the optimum moisture content and maximum dry density values of CAC-blended low-plasticity clay were higher than those of SRC-blended low-plasticity clay. The shear strength of low-plasticity clay was also increased with the CAC and SRC additives. The internal friction angles of CAC-blended low-plasticity clay were higher than those of SRC-improved low-plasticity clay under both the wet-cured and air-dried conditions. The cohesion intercepts of CAC-improved low-plasticity clay under both the wet-cured and air-dried conditions were lower than those of SRC-improved low-plasticity clay. The compressibility and swell characteristics of low-plasticity clay were considerably reduced with both CAC and SRC admixtures. However, the swell and compressibility of CAC-blended low-plasticity clay were lower than those of SRC-blended low-plasticity clay. Generally, the CAC agent was more effective than the SRC agent in the improvement of aforementioned low-plasticity clay properties.
10.14359/51702347
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