Utilization of MSWI fly ash as partial cement or sand substitute with focus on cementing efficiency and health risk assessment

doi:10.1007/s11783-019-1184-6

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Abstract：

• Washed MSWI fly ash was used as partial cement or sand substitute.

• Sand replacing is beneficial for strength, while cement replacement reduces strength.

• Cementing efficiency factor and mortar pore structure explain the strength results.

• Health risk assessment was conducted for MSWI fly ash blended cement mortar.

• CR and HI contributed by different exposures and heavy metals were analyzed.

The strength of cement substituted mortar decreases with the increase in fly ash amount, whereas the strength increases when the fly ash is blended as sand substitute. A mortar with highest strength (compressive strength= 30.2 Mpa; flexural strength= 7.0 Mpa) was obtained when the sand replacement ratio was 0.75%. The k value (cementing efficiency) of fly ash varied between 0.36 and 0.15 for the fly ash fraction in binder between 5% and 25%. The k values of fly ash used for sand replacement were all significantly above that used for cement substitution. The macropores assigned to the gaps between particles decreased when the fly ash was used as sand replacement, providing an explanation for the strength enhancement. The waste-extraction procedure (toxicity-sulphuric acid and nitric acid method (HJ/T 299-2007)) was used to evaluate metal leaching, indicating the reuse possibility of fly ash blended mortar. For the mortar with the mass ratio of fly ash to binder of 0.5%, the carcinogenic risks (CR) and non-carcinogenic hazard quotient (HQ) in sensitive scenario for blended mortar utilization were 9.66 × 10^-⁷ and 0.06, respectively; these results were both lower than the threshold values, showing an acceptable health risk. The CR (9.89 × 10^-⁵) and HQ (3.89) of the non-sensitive scenario for fly ash treatment exceeded the acceptable threshold values, indicating health risks to onsite workers. The main contributor to the carcinogenic and non-carcinogenic risk is Cr and Cd, respectively. The CR and HQ from inhalation was the main route of heavy metal exposure.

Keywords MSWI fly ash Cementing efficiency Health risk assessment of heavy metal Sand replacement Cement replacement

发布日期: 2019-11-19

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	Lei Zheng
	Xingbao Gao
	Wei Wang
	Zifu Li
	Lingling Zhang
	Shikun Cheng

引用本文:

Lei Zheng,Xingbao Gao,Wei Wang, et al. Utilization of MSWI fly ash as partial cement or sand substitute with focus on cementing efficiency and health risk assessment[J]. Front. Environ. Sci. Eng., 2020, 14(1): 5.

网址:

https://journal.hep.com.cn/fese/EN/10.1007/s11783-019-1184-6 OR https://journal.hep.com.cn/fese/EN/Y2020/V14/I1/5

Tab.1 Soluble salts of MSWI fly ash (wt%)

Tab.2 Composition of the different series of cement mortars

Fig.1 Particle size of MSWI fly ash and water washed MSWI fly ash.

Tab.3 Leachable ions of heavy metals in MSWI fly ash and leachable ions limits of heavy metals in cement clinker and leaching results of the crushed hardened mortars (µg/L)

Fig.2 Variation of 7 d compressive strength and flexural strength with respect to different cement mortar compositions.

Fig.3 Cementing efficiencies of MSWI fly ash in cement mortar. The scatters are the calculated data for series 1 and 2. The line is the fitting curve for the series 2.

Fig.4 Pore structure distribution of cement mortars.

Tab.4 Health risk assessment results of water-washed fly ash and its blended mortar (TR= 0.5%)

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