Effect of synthesis parameters on the development of unconfined compressive strength of recycled waste concrete powder-based geopolymers

Huo, Wangwen; Zhu, Zhiduo; Chen, Wu; Zhang, Jie; Kang, Zhuanzhuan; Pu, Shaoyun; Wan, Yu

doi:10.1016/j.conbuildmat.2021.123264

Cited by 82 publications

(22 citation statements)

References 52 publications

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“…The observed relationship might be explained as follows: the continuous addition of CCR will result in an increase in the concentration, and then, excessive OH − concentration will hinder the dissolution of Ca(OH) 2 . Furthermore, if the Ca(OH) 2 concentration is excessive, the thickening of alkali solution will reduce ion mobility such as Si 4+ and Al 3+ from the soil particles, preventing further leaching out of ions; similar phenomena have been identified by other researchers [40,41]. Huo et al [41] investigated the variation of Si 4+ and Al 3+ ions precipitation concentration in NaOH solution of different concentrations, and they found that the precipitation concentration of Si 4+ and Al 3+ ions increased with the increase in NaOH solution concentration.…”

Section: Ph and Electric Conductivitysupporting

confidence: 64%

Effect of Calcium Carbide Residue on Strength Development along with Mechanisms of Cement-Stabilized Dredged Sludge

et al. 2022

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The purpose of this research is to explore the feasibility of using calcium carbide residue (CCR), a by-product from acetylene gas production, as a solid alkaline activator on the strength development in CCR–Portland cement-stabilized dredged sludge (CPDS). The effects of cement content, CCR content and curing time on the strength development of CPDS were investigated using a series of unconfined compressive strength (UCS), pH and electric conductivity (EC) tests. Scanning electron microscopy and X-ray diffraction analyses were performed to gain additional insight into the mechanism of strength development. Meanwhile, the carbon footprints of CPDS were calculated. Following the results, it was found that CCR can significantly improve the strength of cemented dredged sludge. On the basis of the strength difference (ΔUCS) and strength growth rate (UCSgr), it was recommended that utilizing 20% cement with the addition of 20% CCR is the most effective way to develop the long-term strength of CPDS. In addition, the microstructural analysis verified that the optimum proportion of CCR benefits the formation of hydration products in CPDS, particularly needle-like gel ettringite, resulting in a less-porous and dense inter-locked structure. Furthermore, the solidification mechanism of CPDS was discussed and revealed. Finally, it was confirmed that CCR can be a sustainable alternative and effective green alkaline activator for the aim of improving cemented dredged sludge.

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Section: Ph and Electric Conductivitysupporting

confidence: 64%

Effect of Calcium Carbide Residue on Strength Development along with Mechanisms of Cement-Stabilized Dredged Sludge

et al. 2022

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“…Figure 2 illustrates the gradation of selected aggregates for the wearing course. The results of practically all chemical and physical tests conducted in the inquiry office are based on the judgments and standard code derived from a few recent investigations [19,20].…”

Section: Break Elongation 750%mentioning

confidence: 99%

“…The Marshall characteristic values are urged from each tried example, using SNI 06-2489-1991 as a strategy. In addition, the Marshall Stability Method is used in pavement design to determine the rate of Optimum Asphalt Content (OAC) in the mix [20,21]. Preliminary studies included experiments in determining the rate of OAC using Marshall Test settings.…”

Section: Asphalt Pavement Quality Assessmentmentioning

confidence: 99%

The Impact of HDPE Plastic Seeds on the Performance of Asphalt Mixtures

Nawir

2021

Civ Eng J

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Plastic waste processing is a problem that almost several countries in the Asian region are unable to overcome. One of the latest innovations carried out in the field of road pavement construction is mixing HDPE type plastic waste that has been processed into plastic seeds into the asphalt concrete mixture. Previous research has shown that HDPE plastic waste may be reused to improve the physical properties of temperature-sensitive asphalt and improve the stability of asphalt concrete. This study was conducted to determine the effect of using HDPE plastic ore as a mixed additive on the Asphalt Concrete-Wearing Course (AC-WC) using Marshall parameters. Marshall Parameters used are stability, flow, VIM, VMA, VFA, and MQ. The study was conducted in a laboratory by testing 42 samples with different levels of HDPE plastic seeds, mixed using wet methods to determine Marshall Characteristics. Manufacture of test objects using asphalt type, which has a penetration rate of 60/70. The initial research results showed that the optimal asphalt content (OAC) is 5.5%, with the percentage content of HDPE plastic seeds around 0, 1, 2, 3, 4, 5, 6, and 7% compared to asphalt weight. The results showed that the effect of HDPE plastic seed content on the AC-WC mixture increased the value of Marshall Characteristics and met all the requirements of SNI 06-2489-1991. This finding shows that HDPE plastic seeds deserve to be an alternative material for road pavements. Doi: 10.28991/cej-2021-03091744 Full Text: PDF

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“…Moreover, it was found that the volume change of the sample Control 0.41 under curing at 80 °C always fluctuated around the zero point, of which the values ranged from −0.005% to 0.006%. According to previous studies [ 22 , 23 , 24 ], curing at elevated temperatures can significantly increase the mobility of ions. Therefore, curing at 80 °C cannot only accelerate the cement hydration [ 25 ] but also facilitate the ASR expansion [ 26 ].…”

Section: Resultsmentioning

confidence: 99%

Accelerated Curing for Glass-Based Mortars Using Water at 80 °C

Lü

Duan

et al. 2022

Materials

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The substitution of river sand with glass aggregate (GA) and cement with glass powder (GP) is a mainstream method to recycle waste glass. Traditionally, standard curing was widely used for glass-based mortars. However, it is time-consuming and cannot address low mechanical strengths of the early-age mortars. Therefore, the effect of water curing at 80 °C on the properties of GA mortars is investigated. Furthermore, the effect of the GP size is also considered. Results show that compared with the expansion of alkali-silica reaction (ASR), water curing at 80 °C has a negligible effect on the volume change. Moreover, the compressive strength of GA mortars under 1-day water curing at 80 °C is comparable with that under 28-day water curing at 20 °C. Therefore, the 1-day water curing at 80 °C is proposed as an accelerated curing method for GA mortars. On the other hand, the addition of GP with the mean size of 28.3 and 47.9 μm can effectively mitigate the ASR expansion of GA mortars. Compared with the size of 28.3 μm, GA mortars containing GP (47.9 μm) always obtain higher compressive strength. In particular, when applying the 1-day water curing at 80 °C, GA mortars containing GP (47.9 μm) can even gain higher strength than those containing fly ash.

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Effect of synthesis parameters on the development of unconfined compressive strength of recycled waste concrete powder-based geopolymers

Cited by 82 publications

References 52 publications

Effect of Calcium Carbide Residue on Strength Development along with Mechanisms of Cement-Stabilized Dredged Sludge

Effect of Calcium Carbide Residue on Strength Development along with Mechanisms of Cement-Stabilized Dredged Sludge

The Impact of HDPE Plastic Seeds on the Performance of Asphalt Mixtures

Accelerated Curing for Glass-Based Mortars Using Water at 80 °C

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