Determining ASR characteristics using dilatometer method

Ghanem, Hassan; Zollinger, Dan G; Lytton, Robert L.; Ghanem, Noha

doi:10.1016/j.conbuildmat.2012.06.027

Cited by 12 publications

(6 citation statements)

References 5 publications

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“…On the other hand, several aggregates expanded slowly throughout the test, while the others expanded less at the initial stage, but the rate of expansion increased rapidly at later ages. In general, the degree of ASR reactivity of an aggregate is a function of the alkali concentration of the pore solution indicating that a threshold limit of pH-value of a given aggregate exists below which the ASR reaction will take place [40,41]. (b) The mortar bars submerged in 1.0 N NaOH expanded mostly during the early state of testing, and the expansion rate decreased with an increase in test duration.…”

Section: Discussionmentioning

confidence: 99%

“…The mortar expansion increased with elevating solution concentration from 0.25 to 0.5 N due to the fact that, with compared to the 0.25 N NaOH, an increased number of OH -for the 0.5 N NaOH were accessible to take part in the alkali-silica reactions. Finally, the mortar expansion was shown to be the maximum for the of NaOH [38][39][40]. It was also noticed that the ASR-induced cracks on the mortar bars prepared with reactive aggregates increased drastically with an increase in solution concentration.…”

Section: Mortar Expansion Related To Solution Concentrationsmentioning

confidence: 97%

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Role of solution concentration, cement alkali and test duration on expansion of accelerated mortar bar test (AMBT)

et al. 2015

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The deleterious phenomenon in concrete due to alkali-silica reactivity of an aggregate can be evaluated by an accelerated mortar bar test. This study investigates the individual and combined effect of solution concentration, cement alkali and test duration on expansion, and proposes expansion models consisted of the above-mentioned three parameters. The specimens of this study were prepared from six aggregates having different mineralogy, and three dosages of cement alkalis of 0.42, 0.84 and 1.26 % Na 2 O eq . They were submerged in three concentrations (1.0, 0.5 and 0.25 N) of NaOH solution, and were tested at 14, 28, 56 and 98 days. The results showed that the major contributions to expansion were due to solution concentration, followed by test duration and cement alkali.

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Section: Discussionmentioning

confidence: 99%

Section: Mortar Expansion Related To Solution Concentrationsmentioning

confidence: 97%

Role of solution concentration, cement alkali and test duration on expansion of accelerated mortar bar test (AMBT)

et al. 2015

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“…The association constant (K M ) between DMC and PMAA and the polymerization rate (R p ) were examined through bag lter method and dilatometer method, respectively. 27,28 The details about the two methods were listed in ESI Text S1. †…”

Section: Determination Of K M and Reaction Kineticsmentioning

confidence: 99%

Ultrasonic-template technology inducing and regulating cationic microblocks in CPAM: characterization, mechanism and sludge flocculation performance

et al. 2017

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“…In addition, it will reduce the cost of construction and maintenance [19,20]. Nevertheless, one of the main concerns about using plant fibers in concrete is their effect on its performance, especially its durability [21][22][23]. The durability of concrete depends mainly on its ability to resist the penetration of external aggressive agents, such as chloride ions, sulfate, oxygen, and carbon dioxide.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Adding Phragmites australis Fibers on the Properties of Concrete

et al. 2022

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Nowadays, the increasing demand for concrete is causing serious environmental impact including pollution and waste generation, rapid depletion of natural resources, and increased CO2 emission. Incorporating natural fibers in concrete can contribute toward environmental sustainability. This paper is concerned with the use of natural fibers obtained from the plant species Phragmites australis (PA). The plant is invasive, and rapidly grows abundantly along rivers and waterways, causing major ecological problems. This research is part of a wide range investigation on the use of natural fibers produced from the stem of PA plants in concrete. Using a machine, plant stems were crushed into fibers measuring 40 mm in length and 2 mm in width, and treated with 4% NaOH solution for 24 h. A total of four concrete mixes were prepared with varying additions of treated fibers, ranging from 0% to 1.5% (by volume) with water to cement ratio of 0.5% (by volume). Concrete specimens were tested at 3, 7, and 28 days. Testing included compressive strength, density, total water absorption, and capillary water absorption. The results show that incorporating PA natural fibers reduces the water absorption by total immersion and capillary action by up to 45%. Moreover, there is a negligible decrease in concrete density and strength when fibers were added. It is concluded that adding up to 1.5% natural PA fibers to concrete is a feasible strategy to produce an eco-friendly material which can be used in the production of sustainable building material with adequate mechanical and durability performance.

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Determining ASR characteristics using dilatometer method

Cited by 12 publications

References 5 publications

Role of solution concentration, cement alkali and test duration on expansion of accelerated mortar bar test (AMBT)

Role of solution concentration, cement alkali and test duration on expansion of accelerated mortar bar test (AMBT)

Ultrasonic-template technology inducing and regulating cationic microblocks in CPAM: characterization, mechanism and sludge flocculation performance

The Effect of Adding Phragmites australis Fibers on the Properties of Concrete

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