Internally cured high performance concrete with magnesium based expansive agent using coal bottom ash particles as water reservoirs

Rodríguez-Álvaro, Roberto; González-Fonteboa, Belén; Seara-Paz, Sindy; Hossain, Khandaker M. Anwar

doi:10.1016/j.conbuildmat.2020.118977

Cited by 23 publications

(11 citation statements)

References 73 publications

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“…Furthermore, drying shrinkage has a greater magnitude, so that total shrinkage mainly depends on it [9]. In this way, drying shrinkage and total shrinkage usually exhibit similar trends [39]. However, in the present study, this was only fulfilled for two of the three factors analysed:…”

Section: Total Shrinkagementioning

confidence: 53%

“…Furthermore, the lower stiffness of early-age RA compared to matured RA and their shrinkage also increased the total shrinkage of HPC; • On the other hand, the use of MgO reduced the total shrinkage of HPC, even though its use increased drying shrinkage, as was also observed in mortars [40]. This was because the decrease of autogenous shrinkage was much greater than the increase of drying shrinkage caused by the increment of the water content to retain workability [39]. In line with this, the length increase of the specimens during the first days, due to MgO expansion, was explicitly reflected in the total-shrinkage curves (Fig.…”

Section: Total Shrinkagementioning

confidence: 90%

“…As explained in the introduction, reactive MgO is expansive, since the resulting Mg(OH) 2 after its hydration has a larger volume than MgO [27]. This quality allows using this product as shrinkage-reducing agent in cement-based materials [39], as recently demonstrated in mortars [40]. Fig.…”

Section: Shrinkage Behaviour 331 Autogenous Shrinkagementioning

confidence: 99%

“…So far, the use of reactive MgO has been validated exclusively regarding the production of cement pastes and mortars. Recent studies have shown that reactive MgO as cement replacement in relatively high quantities (10-20%) can be successfully used to produce mortars with improved shrinkage behaviour [37], reducing both autogenous [38] and total shrinkage [39]. The decrease in total shrinkage obtained for a MgO content of only 10% was between 18 and 49%, depending on its fineness [40].…”

Section: Introductionmentioning

confidence: 99%

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Mechanical performance and autogenous and drying shrinkage of MgO-based recycled aggregate high-performance concrete

Revilla‐Cuesta

Evangelista

Brito

et al. 2022

Construction and Building Materials

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Section: Total Shrinkagementioning

confidence: 53%

Section: Total Shrinkagementioning

confidence: 90%

Section: Shrinkage Behaviour 331 Autogenous Shrinkagementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Mechanical performance and autogenous and drying shrinkage of MgO-based recycled aggregate high-performance concrete

Revilla‐Cuesta

Evangelista

Brito

et al. 2022

Construction and Building Materials

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“…The only properties that were considered for the assessment of the technical performance are the compressive strength in sealed conditions at 90 days (f c ) and the final autogenous shrinkage (AS) (at 14 days for CM and 56 days for BCM). The compressive strength and shrinkage in airdrying conditions were excluded, as they were only representative of the concrete next to the surface in an improperly cured concrete element [63]. The coefficients 0.6 and 0.4 are chosen to reflect that a higher priority is given to shrinkage over strength when dealing with the internal curing of high performance concrete.…”

Section: Efficiency Of Leca and Wamentioning

confidence: 99%

Wood ash versus expanded clay aggregate as internal curing water reservoirs in high performance concrete

et al. 2022

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The performances of expanded clay aggregate and wood ash as internal curing water reservoirs were studied in the mortar phase of a hypothetical high performance concrete with a low water-to-binder ratio. The two materials substituted the 15 and 30% of the sand volume. Two different binders, Portland cement and high-volume fly ash blended cement, were used. The compressive strength and the volume stability of the mortars in sealed and air-drying conditions were studied. Furthermore, the desorption capacity of the internal curing water reservoirs and the internal humidity inside the mortars during the first days after casting were analysed. The results shown that the reduction in the self-desiccation shrinkage was higher when the expanded clay aggregate was used, even in air-drying curing conditions, due to its higher desorption capacity in low-relative-humidity environments in comparison to that of the wood ash. However, wood ash had a stronger beneficial effect on early age autogenous shrinkage without significantly increasing the drying shrinkage. The two alternative aggregates influenced the strength moderately. Considering the technical, economic, and environmental implications of using the two lightweight aggregates, wood ash is recommended.

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An experimental study on strength and durability characteristics of self‐curing self‐compacting concrete

Mohan¹,

Kumar²,

Manoj³

2022

Structural Concrete

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The present study is focused on the compressive strength, water retention, and workability by varying the percentage of poly ethylene glycol 200 and liquid paraffin wax from 0% to 1% by weight of cement for self‐compacting concrete and compares it with conventional SCC. Percentages of 0.1%, 0.5%, and 1% (in proportion to the weight of cement) were adopted in the study. The comparison was done in a grade concrete and with cases such as indoor curing and water‐based curing. Slump‐flow test and V‐funnel tests were carried out on the fresh concrete to evaluate the workability of concrete. Concrete weight loss with time is evaluated to determine the water retention capacity. Compressive strength of cube specimens was conducted at the end of 7 and 28 days of curing. The durability of the concrete was assessed by immersing the concrete specimens in acids. The fresh properties were satisfied according to EFNARC specifications. Based on the weight loss percentage and satisfaction of compressive strength, the dosage of a self‐curing compound was determined. XRD analysis of the concrete was also performed on the concrete specimens.

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Internally cured high performance concrete with magnesium based expansive agent using coal bottom ash particles as water reservoirs

Cited by 23 publications

References 73 publications

Mechanical performance and autogenous and drying shrinkage of MgO-based recycled aggregate high-performance concrete

Mechanical performance and autogenous and drying shrinkage of MgO-based recycled aggregate high-performance concrete

Wood ash versus expanded clay aggregate as internal curing water reservoirs in high performance concrete

An experimental study on strength and durability characteristics of self‐curing self‐compacting concrete

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