Weathering properties of CO2-cured concrete blocks

Shi, Caijun; Wang, Dehui; He, Fuqiang; Liu, Meng

doi:10.1016/j.resconrec.2012.04.005

Cited by 76 publications

(13 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The UPV of specimens continued to increase in outdoor weathering conditions due to the environment's moist and further hydration of un-hydrated or un-reacted cement particles within the specimens. Similar results have been reported elsewhere (Gunasekaran, Annadurai, and Kumar, 2012;Shi, 2012). A higher UPV shows better uniformity of the concrete.…”

Section: Effect Of Outdoor Weather Exposuresupporting

confidence: 91%

“…As shown in Fig. 6, due to the moist environment and further hydration of unhydrated cement particles within the samples under outdoor weathering condition, strength values are similar to those for water curing at the same age explained in the previous section; this is in agreement with the results reported by Gunasekaran, Annadurai, and Kumar, 2012;Shi, 2012;Roy, Puh and Northwood, 1999. The reduction in strength was between 2 and 75%, 24 and 70%, and 7 and 70% in comparison with the control concrete for Series 1, 2, and 3, respectively.…”

Section: Effect Of Outdoor Weathering Exposuresupporting

confidence: 90%

See 1 more Smart Citation

Assessment of Curing Exposures Effect on the Long-term Engineering Properties of Novel Lightweight Aggregate Concrete

Jannaty

Atrushi

2020

ARO

View full text Add to dashboard Cite

At present, most of the generated waste expanded polystyrene (EPS) in developed countries are transported to landfill and in some developing and/or less-developed countries such as Iraq are sent to open landscapes; consequently, this inadequate waste disposal can be very dangerous to our health and environment. This study describes engineering properties of sustainable lightweight aggregate concrete (LWAC) incorporating novel aggregates of waste EPS produced by a unique recycling technique of densifying. The new recycling technique significantly improved the segregation resistance of EPS beads in concrete as these beads are ultra-light material. The novel LWA of densified EPS (DEPS) was used as partial natural aggregate replacement in the mixes. Three water/cement (W/C) ratios were used. Three different types of curing conditions of indoor full water curing, outdoor weathering exposure, and heating exposure were employed during this study to represent different conditions which concrete may be subject to. The engineering properties of concrete investigated were consistency, dry density, compressive strength, and ultrasonic pulse velocity (UPV) for long-term performance of more than one-year age. It was indicated that the properties of concrete were not only primarily influenced by the employed curing conditions but the content of DEPS in the mixtures and additionally the W/C ratio had effect on the properties of concrete. However, adequate engineering properties can be achieved using an appropriate amount of DEPS with proper W/C and curing conditions.

show abstract

Section: Effect Of Outdoor Weather Exposuresupporting

confidence: 91%

Section: Effect Of Outdoor Weathering Exposuresupporting

confidence: 90%

Assessment of Curing Exposures Effect on the Long-term Engineering Properties of Novel Lightweight Aggregate Concrete

Jannaty

Atrushi

2020

ARO

View full text Add to dashboard Cite

show abstract

“…Furthermore, the carbonated concrete exhibits a similar compressive strength to that of steam-cured concrete during winter weathering exposure [333]. Shi et al [334,335] suggested that pre-conditioning environments have the most crucial effect on the effectiveness of CO2 curing. Additionally, the temperature of the samples rises very quickly once the samples are exposed to CO2; this could reach a peak value of 70 °C during the first 15-20 min, then goes down gradually with time.…”

Section: Carbonated Portland Cement (Pc) Bindersmentioning

confidence: 97%

Recent progress in low-carbon binders

Shi

Provis

2019

Cement and Concrete Research

Self Cite

490

131

View full text Add to dashboard Cite

The development of low-carbon binders has been recognized as a means of reducing the carbon footprint of the Portland cement industry, in response to growing global concerns over CO2 emissions from the construction sector. This paper reviews recent progress in the three most attractive low-carbon binders: alkali-activated, carbonate, and belite-ye'elimite-based binders. Alkali-activated binders/materials were reviewed at the past two ICCC congresses, so this paper focuses on some key developments of alkali-activated binders/materials since the last keynote paper was published in 2015. Recent progress on carbonate and belite-ye'elimite-based binders are also reviewed and discussed, as they are attracting more and more attention as essential alternative low-carbon cementitious materials. These classes of binders have a clear role to play in providing a sustainable future for global construction, as part of the available toolkit of cements.

show abstract

“…Ordinary Portland cement was the most common binder that upon hydration produced C-S-H gel, ettringite hydrate and monosulphate, which served to immobilize contaminants and fill in pores of the matrix to provide mechanical strength [20]. In order to reduce the economic costs and carbon footprint associated with cement production, coal fly ash and lime were also widely used as cement substitutes.…”

Section: Introductionmentioning

confidence: 99%