Optimization of Steam-Curing Regime for Recycled Aggregate Concrete Incorporating High Early Strength Cement—A Parametric Study

Hanif, Asad; Kim, Yongjae; Usman, Muhammad; Park, Cheolwoo

doi:10.3390/ma11122487

Cited by 24 publications

(13 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The researchers [34,35] investigated that steam cured concrete has less compressive strength than moist cured concrete at 28 days, indicating that ordinary concrete has lower strength gaining rate after steam curing. However, the steam curing concrete having SCMs has high rate of strength development.…”

Section: Effect Of Steam Curing On Strength Gainmentioning

confidence: 99%

Crossover Effect in Cement-Based Materials: A Review

et al. 2019

View full text Add to dashboard Cite

Cement-based materials (CBMs) such as pastes, mortars and concretes are the most frequently used building materials in the present construction industry. Cement hydration, along with the resulting compressive strength in these materials, is dependent on curing temperature, methods and duration. A concrete subjected to an initial higher curing temperature undergoes accelerated hydration by resulting in non-uniform scattering of the hydration products and consequently creating a great porosity at later ages. This phenomenon is called crossover effect (COE). The COE may occur even at early ages between seven to 10 days for Portland cements with various mineral compositions. Compressive strength and other mechanical properties are important for the long life of concrete structures, so any reduction in these properties is of great concern to engineers. This study aims to review existing information on COE phenomenon in CBMs and provide recommendations for future research.

show abstract

Section: Effect Of Steam Curing On Strength Gainmentioning

confidence: 99%

Crossover Effect in Cement-Based Materials: A Review

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Standard quartz sand (fineness modulus; 2.92; water absorption; 2.40%, unit weight; 1597 kg/m 3 ; specific gravity; 2.60, and 2.2% particles passing through #200 sieve) was used as fine aggregate in preparing the mortar specimens. The tests were conducted in accordance with Korean standards [38,39,40] and adopted in [41].…”

Section: Materials and Experimental Methodsmentioning

confidence: 99%

Incorporating Liquid Crystal Display (LCD) Glass Waste as Supplementary Cementing Material (SCM) in Cement Mortars—Rationale Based on Hydration, Durability, and Pore Characteristics

2018

Self Cite

View full text Add to dashboard Cite

This paper assesses the feasibility of using liquid crystal display (LCD) waste glass as a supplementary cementing material in cement mortars. Two different sizes of LCD waste glass powder (LGP) particles were used (5 µm and 12 µm) with two substitution levels with cement in mortar (10% and 20%). The resulting mortars were evaluated for strength, hydration, porosity and durability through various experimental techniques. It was found that LGP particles lead to appreciable strength gain at all ages in comparison with control mortar, especially significant strength gain of 18% was observed at 28-day. This is attributed to the greater gel-space ratio as corroborated by the experimental determination of porosity, which is found less for LGP-incorporated mortars as compared to control cement mortar. The smaller particle size of LGPs not only accelerates the pozzolanic reaction in alkaline cementitious matrix, but also fills the smaller pores, thus reducing porosity and contributing to strength gain. Increased hydration was also elucidated qualitatively by backscattered electron imaging. Due to the increased hydration in LGP-incorporated pastes and mortars, the durability (in terms of chloride ion permeability) has also been found improved. Thus, it is established that 10% (by weight) of cement can be replaced with 12 μm LGP, whereas 20% can be replaced with 5 μm LDP for improved strength and durability. Incorporating LCD waste in mortars and concretes as partial replacement of cement can not only help utilize this potentially hazardous waste, but also significantly reduce the associated carbon dioxide emissions, thus promoting sustainable development.

show abstract

“…The primary binders used in this study included ordinary Portland cement (OPC) and moderately high early strength cement (MESC). The materials characterization details have already been published earlier in [31] (specific gravity of OPC and MESC: 3.14 and 3.17; Blain surface area: 3340 cm 2 /g and 4490 cm 2 /g; loss on ignition: 2.26% and 1.05%, respectively, conforming to Korean Standards KSL5201-1989. The cement used was produced in the Republic of Korea by the Sungshin Portland Cement Co. Ltd.).…”

Section: Raw Materialsmentioning

confidence: 99%

“…The mix design procedure and concrete mixing, casting, and curing were done according to American Concrete Institute (ACI) standards [44][45][46], and explained by the authors in previously published findings [2,16,17,31,47] and are hence not repeated here. The mix proportions for each series are given in Table 2.…”

Section: Mixture Proportioning and Specimen Castingmentioning

confidence: 99%

“…Precast concrete is employed to ensure (i) quality control, (ii) faster fabrication and construction, and (iii) ease of erection of structural elements at the construction site [27][28][29][30]. In order to attain speedy fabrication of precast elements, use of high early strength cement [2,31] and steam curing [16,17] has been shown beneficial. It is, however, interesting to see that only a handful of research findings are available on the determination of optimal steam curing regime parameters [32][33][34] which particularly deal with ordinary concrete.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Steam-cured recycled aggregate concrete incorporating moderately high early strength cement: effect of binder content and curing conditions

2019

Self Cite

View full text Add to dashboard Cite

Steam curing employed for faster strength gain due to higher hydration rate may lead to shrinkage issues, and hence the use of moderately high early strength cement (MESC) is proposed instead of typically used high early strength cement (HESC) which has a high C3S content. This paper evaluates the suitability of MESC for use in precast concrete. The objective was to (i) determine the feasibility of MESC in recycled aggregate concrete (RAC), (ii) determine the optimum steam curing conditions (curing duration, maximum temperature, and duration of holding maximum temperature), and (iii) evaluating the beneficial use of reduced binder content to compensate for steam curing. Four series of RAC were developed which were subjected to nine different steam curing condition, and the resulting strength properties were determined. Though all the developed concrete specimens achieved the design strength of 30 MPa, those cured at 50 °C with 1 h duration of exposure to maximum temperature exhibited the best performance. Further, it was found that even though reducing the binder content reduces the ultimate strength at 28-day age, curing at 70 °C with 2 h exposure to maximum temperature duration (for 7% reduction in binder volume) leads to merely 11.8% strength decline. It is concluded that MESC can be effectively used in steam cured RAC instead of OPC and HESC with meagre strength loss when cured at maximum temperature of 50 °C maintained for 1 h while the total curing time being 4.5 h. Thus, utilizing MESC in RAC shall not only help combat the persistently declining natural resources but also reduced the associated carbon dioxide emissions, thereby promoting sustainable development.

show abstract

Optimization of Steam-Curing Regime for Recycled Aggregate Concrete Incorporating High Early Strength Cement—A Parametric Study

Cited by 24 publications

References 41 publications

Crossover Effect in Cement-Based Materials: A Review

Crossover Effect in Cement-Based Materials: A Review

Incorporating Liquid Crystal Display (LCD) Glass Waste as Supplementary Cementing Material (SCM) in Cement Mortars—Rationale Based on Hydration, Durability, and Pore Characteristics

Steam-cured recycled aggregate concrete incorporating moderately high early strength cement: effect of binder content and curing conditions

Contact Info

Product

Resources

About