Investigation of physical and mechanical properties of mortars produced by polymer coated perlite aggregate

Akyüncü, Veysel; Sanliturk, Firat

doi:10.1016/j.jobe.2021.102182

Cited by 22 publications

(10 citation statements)

References 22 publications

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“…However, its porous nature affects the workability of concrete and as more water is necessary for the soaking of the perlite aggregates, the strength of LWC is counted to be decreased [19]. Research on sealing the open pore system of expanded perlite mainly by applying hydrophobic coatings has already been reported in the literature [20,21] and further investigation into the subject will be productive.…”

Section: Introductionmentioning

confidence: 99%

Durability of Structural Lightweight Concrete Containing Different Types of Natural or Artificial Lightweight Aggregates

Badogiannis

Stratoura

Aspiotis

et al. 2021

CMD

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Different structural lightweight concrete mixtures of specific density and strength classes were produced by using various lightweight aggregates (LWAs) such as pumice, perlite, and rice husk ash. Their properties were evaluated in fresh and hardened states with regards to compressive strength and durability parameters such as water absorption (open porosity and capillary absorption), chloride’s penetration resistance, and carbonation depth. According to the results, most LWA concrete mixtures performed satisfactorily in terms of the designed strength and density and they could be used as structural LWA concrete mixtures. As far as the durability of LWA concrete was concerned, open porosity and resistance to the carbonation of LWA concrete were burdened with the porous nature of LWAs, while sorptivity in some mixtures and especially chlorides’ penetration resistance in all mixtures were reported to be significantly improved. The overall strength and durability performance of the designed LWA concrete mixtures could mitigate the concerns stemming from its vulnerability to extreme exposure conditions.

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Section: Introductionmentioning

confidence: 99%

Durability of Structural Lightweight Concrete Containing Different Types of Natural or Artificial Lightweight Aggregates

Badogiannis

Stratoura

Aspiotis

et al. 2021

CMD

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“…On the one hand, a lot of research [ 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ] proved that application of initially impregnated LWAs may result in lower cement content, stabilization of concrete workability, the decrease in concrete water absorption, shorter time of element/structure drying out and the increase in concrete strength and durability as well as thermal and acoustic insulation. On the other hand, LWAs impregnation may restrain internal curing with water accommodated in aggregate, the increase in concrete autogenous shrinkage, the increase in a rate of drying shrinkage and the increase in density, as well as deterioration of the bond between aggregate and cement paste [ 12 , 13 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Lightweight Aggregate Impregnation on Selected Concrete Properties

Domagała

Podolska

2021

Materials

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The impregnation of lightweight aggregate (LWA) is an alternative method to its pre-moistening, which is used to limit the loss of fresh concrete workability due to the aggregate’s ability to absorb a great amount of mixing water. The aim of this study was to access the effectiveness, by pre-coating LWAs with cement paste, in modifying the properties of concrete composites. Two types of lightweight aggregates (Lytag and Leca) characterized with a relatively open-structure shell were selected. The other changeable parameters taken into consideration in this research were: LWA size, initial moisture of aggregate before the impregnation process and type of cement paste applied as an impregnant. Sixteen concretes prepared with pre-moistened and pre-coated lightweight aggregates were subject to a density test in different moisture conditions, a water absorption test and a compressive strength test. On the one hand, the pre-coating of LWAs with cement paste resulted in a relatively slight increase in concrete density (by up to 19%) compared to the pre-moistening of LWAs. On the other hand, it caused a very significant reduction (by up to 52%) in the composite’s water absorption and an incomparably greater growth (by up to 107%) in compressive strength. The most crucial factors determining the effectiveness of impregnation of LWAs with cement pastes in improvement of composite properties were the aggregate type and its size. The composition of impregnating slurry and the initial moisture content of LWA before pre-coating also mattered.

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“…There are many technologies used for aggregate impregnations. In order to increase the aggregate tightness, depending on its type, it may be coated with e.g.,: cement paste [ 21 , 22 , 23 , 24 , 25 , 26 ], natural and synthetic polymers [ 21 , 24 , 27 , 28 , 29 , 30 , 31 , 32 ], calcium metasilicate [ 33 ], sodium silicate [ 22 , 24 , 30 ] or sodium carbonate solutions [ 34 , 35 ], kerosene, different oils [ 24 ], paraffin [ 18 , 31 , 36 , 37 , 38 , 39 ]. It should be stated that in some research, the priority goal of LWA immersion in paraffin or polyethylene glycol is not so much to make concrete tighter but to incorporate the phase change material into the composite in order to improve its thermal properties [ 31 , 36 , 37 ] or freeze-thaw resistance [ 39 ].…”

Section: Introductionmentioning

confidence: 99%

“…Generally, the impregnation process of a lightweight aggregate may lead to a lower cement content, stabilization of concrete workability, decrease in concrete water absorption, shorter time of element/structure drying out, the increase in concrete durability, strength, thermal, and acoustic insulation [ 24 , 25 , 28 , 29 , 30 , 31 , 32 , 33 , 36 ]. On the other hand, LWA pre-coating may affect the higher concrete density, lack of internal curing with water accommodated in aggregate, higher autogenous shrinkage, and higher rate of drying shrinkage, leading to a worse bond between aggregate and cement paste [ 24 , 31 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

“…The idea of the impregnation of lightweight aggregates [ 22 , 24 ] or recycled concrete aggregates (RCA) [ 21 , 22 , 23 , 26 ] with cement paste seems to be less popular than pre-coating the aggregates with polymers [ 21 , 24 , 27 , 28 , 29 , 30 , 31 , 32 ]. There are probably some concerns regarding less effective impregnation with cement paste in concrete tightness enhancement, higher increase in density, or slightly longer procedure of preparation.…”

Section: Introductionmentioning

confidence: 99%

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The Properties of Lightweight Aggregates Pre-Coated with Cement Pastes and Their Suitability for Concrete

Domagała

Bryła

2021

Materials

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One of the biggest technological problems connected with the production of lightweight concretes made of porous aggregates is their much higher water absorption, which may cause on the one hand workability loss, and on the other hand excess water content in concrete. The aim of this research was to assess the effect of impregnation of lightweight aggregates (LWAs) with cement paste on their properties and to verify its effectiveness in concretes. Three types of lightweight aggregates differing in porosity and pore structure (sintered fly ash Lytag, expanded clay: Leca and Liapor) were selected for the tests. The following parameters were taken into consideration in the research program: LWA type and size, LWA initial moisture content, strength, and rheology of cement pastes. The tests of 22 different aggregates, plain and coated with cement paste, included density, crushing strength, and development of water absorption in time. The research program proved that porous aggregates, due to their impregnation with cement pastes, may be effectively sealed and strengthened. All tested LWAs showed a considerable decrease in water absorption by up to 71%. However, only Lytag aggregate showed a visibly enhanced crushing strength. Verification of effectiveness of aggregate sealing on the enhancement of concrete properties showed both a considerable reduction in water absorption of composites (by up to 52%) and a very high increase in their strength (by up to 107%).

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Investigation of physical and mechanical properties of mortars produced by polymer coated perlite aggregate

Cited by 22 publications

References 22 publications

Durability of Structural Lightweight Concrete Containing Different Types of Natural or Artificial Lightweight Aggregates

Durability of Structural Lightweight Concrete Containing Different Types of Natural or Artificial Lightweight Aggregates

Effect of Lightweight Aggregate Impregnation on Selected Concrete Properties

The Properties of Lightweight Aggregates Pre-Coated with Cement Pastes and Their Suitability for Concrete

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