Effects of pre-soaked super absorbent polymers on fresh and hardened properties of self-consolidating lightweight concrete

AzariJafari, Hessam; Kazemian, Ali; Rahimi, Motahareh; Yahia, Ammar

doi:10.1016/j.conbuildmat.2016.03.010

Cited by 56 publications

(26 citation statements)

References 23 publications

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“…For further investigation, the present study is an effort to assess the effect of SF and PF at various volume contents on the mechanical properties of concrete incorporating LECA with W/B ratios of 0.37 and 0.42 at 3, 7, 28 and 60 days. Since the curing regime and age can affect the mechanical properties of concrete materials [50][51][52][53][54][55] and wet curing condition appear to be highly effective in improving the compressive strength of fibre reinforced concrete (FRC) and LC [56,57], cubic and cylindrical specimens were cured under six curing conditions: wet, 3-day wet, 14-day wet, air-dry controlled, air-dry uncontrolled, and 90 °C vapour. Therefore, the concrete specimens were cured by immersion in a water tank and taken out after different ages; then, the results of these specimens were compared with those cured under 90 °C vapour curing condition.…”

Section: Concrete Is One Of Most Popular Construction Materials and Imentioning

confidence: 99%

Effect of the curing type on the mechanical properties of lightweight concrete with polypropylene and steel fibres

Madandoust

Kazemi

Talebi

et al. 2019

Construction and Building Materials

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This study assessed the effect of steel and polypropylene fibres at various volume contents on concrete incorporating lightweight expanded clay aggregate (LECA) and water/binder (W/B) ratios of 0.37 and 0.42. The concrete specimens were cured under six curing conditions: wet, 3-day wet, 14-day wet, air-dry controlled, air-dry uncontrolled, and 90 °C vapour. The use of lightweight aggregates in the construction industry has drawn the attention of researchers and, on the other hand, fibres with a high strain-hardening response can be used as an appropriate addition in concrete materials. In this study, the mechanical properties of lightweight concrete containing steel or polypropylene fibres were evaluated by means of compressive strength, splitting tensile strength and modulus of elasticity tests at 3, 7, 28 and 60 days. According to the results, fibre reinforced concrete mixes containing LECA, cured under 90 °C vapour curing, achieved the highest mechanical strength. In addition, the optimum contents of steel fibres to obtain the highest compressive and splitting tensile strengths of lightweight concrete were 1% and 3%, respectively.

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Section: Concrete Is One Of Most Popular Construction Materials and Imentioning

confidence: 99%

Effect of the curing type on the mechanical properties of lightweight concrete with polypropylene and steel fibres

Madandoust

Kazemi

Talebi

et al. 2019

Construction and Building Materials

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“…In addition, cubic specimens were cast and prepared and tested with the Schmidt rebound hammer at 11, 28, 42 and 90 days. Since the curing regimes can affect the mechanical properties of concrete materials [34][35][36][37], plain concrete slabs and cubic specimens were cured under both wet and dry conditions. The results of Schmidt rebound hammer and core testing were compared with those of standard cube tests.…”

Section: Introductionmentioning

confidence: 99%

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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“…When SAP powder is added to cement-based mixtures, although it shows a favorable dispersibility in cement-based materials, a common phenomenon of “competitive absorption” is prone to occur between SAP and cement-based materials during mixing and remarkably influences the workability and rheology of mixtures [30,31,32]. As for the swelled SAP, it normally releases the water too rapidly in cement-based mixtures, which can increase the total water-to-cement ratio, impair the effectiveness of internal curing, and work against the mechanical performance of cement-based materials [33,34,35].…”

Section: Introductionmentioning

confidence: 99%

Performances of Cement Mortar Incorporating Superabsorbent Polymer (SAP) Using Different Dosing Methods

et al. 2019

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Modified cement mortar was prepared by incorporating a superabsorbent polymer (SAP) with two kinds of dosing state, dry powdery SAP and swelled SAP (where the SAP has been pre-wetted in tap water), respectively. The mechanical properties, drying shrinkage and freeze–thaw resistance of the mortars were compared and analyzed with the variation of SAP content and entrained water-to-cement ratios. Additionally, the effect of SAP on the microstructure of mortar was characterized by scanning electron microscopy (SEM). The results indicate that agglomerative accumulation is formed in the voids of mortar after water desorption from SAP and there are abundant hydration products, most of which are C-S-H gels, around the SAP voids. The incorporation of the powdery SAP increases the 28 d compressive strength of the mortars by about 10% to 50%, while for the incorporation of swelled SAP, the 28 d compressive strength of the mortar can be increased by about −26% to 6%. At a dosage of 0.1% SAP and an entrained water–cement ratio of 0.06, the powdery SAP and the swelled SAP can reduce the mortar shrinkage rate by about 32.2% and 14.5%, respectively. Both the incorporation of powdery and swelled SAP has a positive effect on the freeze–thaw resistance of cement mortar. In particular, for powdery SAP with an entrained water-to-cement ratio of 0.06, the mass loss rate after 300 cycles is still lower than 5%.

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Effects of pre-soaked super absorbent polymers on fresh and hardened properties of self-consolidating lightweight concrete

Cited by 56 publications

References 23 publications

Effect of the curing type on the mechanical properties of lightweight concrete with polypropylene and steel fibres

Effect of the curing type on the mechanical properties of lightweight concrete with polypropylene and steel fibres

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

Performances of Cement Mortar Incorporating Superabsorbent Polymer (SAP) Using Different Dosing Methods

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