Influence of different monomer ratios and recycled concrete aggregate on mechanical properties and durability of geopolymer concretes

Koushkbaghi, Mahdi; Alipour, Pedram; Tahmouresi, Behzad; Mohseni, Ehsan; Saradar, Ashkan; Sarker, Prabir Kumar

doi:10.1016/j.conbuildmat.2019.01.174

Cited by 106 publications

(53 citation statements)

References 68 publications

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“…conditions was on average about 35% higher than that under dry curing conditions. So, as expected, the curing regimes affect the compressive strength of concrete specimens [46][47][48][49][50][51] and the difference between wet and dry curing conditions can go up to 50% as reported by Mamola and Zaniewski [52]. Under wet curing conditions, the cube compressive strength of the control concrete was on average about 47.6% greater than that of RAC.…”

Section: Slumpsupporting

confidence: 66%

Compressive strength assessment of recycled aggregate concrete using Schmidt rebound hammer and core testing

Kazemi

Madandoust

Brito

2019

Construction and Building Materials

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The main objective of this study was to estimate the compressive strength of recycled aggregate concrete (RAC) by means of Schmidt rebound hammer and core testing. The use of recycled aggregate in concrete has been shown to lead to a decrease in the construction cost and it can reduce the burden on the environment by saving natural aggregates. On the other hand, some nondestructive and semi-destructive techniques, such as Schmidt rebound hammer and core testing, are long-established methods for strength estimation of materials. Thus, the present study intended to obtain the compressive strength of RAC using these methods and then compare it with the results of 150 mm cube specimens. To achieve this goal, after producing concrete mixes with 70% replacement of recycled coarse aggregate, 96 cube specimens and 8 concrete slabs were cast to perform Schmidt rebound hammer, core and cube testing. In addition, the combination of the methods was used to obtain correlations between Schmidt rebound hammer and core testing. The results demonstrate that a multi-variable equation using these tests' results can efficiently predict the compressive strength of RAC and conventional concrete and is more promising than single-variable equations based on the Schmidt rebound hammer test results.

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Section: Slumpsupporting

confidence: 66%

Compressive strength assessment of recycled aggregate concrete using Schmidt rebound hammer and core testing

Kazemi

Madandoust

Brito

2019

Construction and Building Materials

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“…During experimental studies, researchers revealed that the cement paste, including RHA, had a smaller quantity of calcium hydroxide because of the pozzolanic reaction [53]. Accordingly, the porosity and the content of portlandite in the ITZ are reduced in the composite; due to this, the width of this zone between the cement paste and the aggregate is also reduced [54,55]. Reportedly, the improvement in the concrete properties due to the addition of RHA particles has been mainly due to the creation of more C-S-H gels but low portlandite in the composite because of the interaction between the ash and the OHand Ca + ions, as well as calcium hydroxide [3].…”

Section: Pozzolanic Activitymentioning

confidence: 99%

Rice Husk Ash-Based Concrete Composites: A Critical Review of Their Properties and Applications

et al. 2021

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In the last few decades, the demand for cement production increased and caused a massive ecological issue by emitting 8% of the global CO2, as the making of 1 ton of ordinary Portland cement (OPC) emits almost a single ton of CO2. Significant air pollution and damage to human health are associated with the construction and cement industries. Consequently, environmentalists and governments have ordered to strongly control emission rates by using other ecofriendly supplemental cementing materials. Rice husk is a cultivated by-product material, obtained from the rice plant in enormous quantities. With no beneficial use, it is an organic waste material that causes dumping issues. Rice husk has a high silica content that makes it appropriate for use in OPC; burning it generates a high pozzolanic reactive rice husk ash (RHA) for renewable cement-based recyclable material. Using cost-effective and commonly obtainable RHA as mineral fillers in concrete brings plentiful advantages to the technical characteristics of concrete and to ensure a clean environment. With RHA, concrete composites that are robust, highly resistant to aggressive environments, sustainable and economically feasible can be produced. However, the production of sustainable and greener concrete composites also has become a key concern in the construction industries internationally. This article reviews the source, clean production, pozzolanic activity and chemical composition of RHA. This literature review also provides critical reviews on the properties, hardening conditions and behaviors of RHA-based concrete composites, in addition to summarizing the research recent findings, to ultimately produce complete insights into the possible applications of RHA as raw building materials for producing greener concrete composites—all towards industrializing ecofriendly buildings.

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“…As for GPC composed of metakaolin (MK) as an aluminosilicate source along with recycled concrete aggregate (RCA) as a partial alternative of natural aggregate, Koushbaghi et al [49] conducted a microstructural analysis to determine the effects of SS/SH ratio and RCA in diverse dosages on mechanical properties and GPC durability via scanning electron microscopic (SEM). Test results indicated that GPC compressive strength developed with an enhanced SS/SH ratio (Figure 6).…”

Section: Efficiency Of Alkaline Solution and Ambient Condition On Gpcmentioning

confidence: 99%

A Mini Review on Properties of Portland Cement Concrete with Geopolymer Materials as Partial or Entire Replacement

Tee

Mostofizadeh

2021

Infrastructures

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The main aim of this paper is to review recent studies over the past 10 years investigating the influencing factors for improving the mechanical properties of concrete. This focuses on concrete comprising of pozzolanic materials, partially or entirely replacing ordinary Portland cement, in the concrete mixture. Firstly, the effectiveness of main factors such as temperature, water to solid (W/S) ratio, and alkaline solution ratio was briefly discussed. Next, the effects of significant factors such as different superplasticizer and alkaline solutions and combinative materials on the improvement of concrete workability were reviewed and compared. Eventually, other concrete properties such as water absorption and durability were discussed in the last section. After reviewing all types of concrete additives, including mineral or chemical materials, the influence of these admixtures under different laboratory conditions were highlighted to objectively evaluate the benefits of each factor. As a whole, the significant reasons of such experimental tests arising from the usage of these materials, in accordance with the laboratory results obtained from these investigations, are discussed.

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Influence of different monomer ratios and recycled concrete aggregate on mechanical properties and durability of geopolymer concretes

Cited by 106 publications

References 68 publications

Compressive strength assessment of recycled aggregate concrete using Schmidt rebound hammer and core testing

Compressive strength assessment of recycled aggregate concrete using Schmidt rebound hammer and core testing

Rice Husk Ash-Based Concrete Composites: A Critical Review of Their Properties and Applications

A Mini Review on Properties of Portland Cement Concrete with Geopolymer Materials as Partial or Entire Replacement

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