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International Concrete Abstracts Portal

Showing 1-5 of 19 Abstracts search results

Document: 

19-193

Date: 

March 1, 2020

Author(s):

Murat Mollamahmutoglu and Eyubhan Avcı

Publication:

Materials Journal

Volume:

117

Issue:

2

Abstract:

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.

DOI:

10.14359/51722403


Document: 

18-444

Date: 

March 1, 2020

Author(s):

Wang Penghui, Qiao Hongxia, Feng Qiong, and Cao Hui

Publication:

Materials Journal

Volume:

117

Issue:

2

Abstract:

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.

DOI:

10.14359/51720298


Document: 

17-367

Date: 

November 1, 2018

Author(s):

Murat Mollamahmutoglu and Eyubhan Avcı

Publication:

Materials Journal

Volume:

115

Issue:

6

Abstract:

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.

DOI:

10.14359/51702347


Document: 

17-226

Date: 

July 1, 2018

Author(s):

Murat Mollamahmutoglu and Eyubhan Avcı

Publication:

Materials Journal

Volume:

115

Issue:

4

Abstract:

The aim of this research was to investigate such geotechnical properties as consistency limits, unconfined compressive strength (UCS), permeability, swelling potential, and the compressibility of slag-based, superfine cement (SSC)-stabilized, high-plasticity clayey soil. UCS of high-plasticity clayey soil was increased by SSC stabilization under both wet-cured and air-dried conditions. UCS values of SSC stabilized specimens under both conditions increased with time. Additionally, UCS values of SSC-stabilized specimens under air-dried condition were higher than those of SSC- stabilized specimens under wet-cured condition. The permeability of high plasticity clayey soil was reduced by the SSC stabilization, and the permeability of SSC-stabilized soil decreased with time. The swelling potential and the compressibility of high-plasticity clayey soil were also reduced by SSC stabilization.

DOI:

10.14359/51701924


Document: 

16-185

Date: 

July 1, 2017

Author(s):

Vahab Toufigh, Mostafa Jafarian Abyaneh, and Khashayar Jafari

Publication:

Materials Journal

Volume:

114

Issue:

4

Abstract:

In this investigation, polymer concrete (PC) with three different epoxy resin contents, ordinary cement concrete (OCC), lightweight concrete (LWC), and lime-mortar soil (LMS) have been studied under uniaxial and triaxial compression tests to determine their mechanical behavior by measuring axial stress-strain and volumetric strain versus axial strain curves. According to the results, PC showed higher strength, ductility, and energy absorption than that of OCC and LWC. Then, nonlinear finite element analysis (NFEA) was implemented to predict the experimental results using hierarchical single-surface (HISS) failure criterion and disturbed state concept (DSC) to capture the elastoplastic behavior of concrete materials including volumetric strain. Moreover, the pattern of failure was estimated using ultimate disturbance values obtained from the model, followed by comparison with the experimental and Mohr-Coulomb failure patterns. The proposed model is applicable to a variety of materials with different behavior, and its prediction is in good accordance with experimental results.

DOI:

10.14359/51689716


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