Sustainable Lightweight Concrete Designed with Modified Solidified Wastewater Sludge as Partial Replacement of Cement

被引：0

作者：

Skondric, Marina ^{[1
]}

Radevic, Aleksandar ^{[1
]}

Savic, Aleksandar ^{[1
]}

Naunovic, Zorana ^{[1
]}

Radovanovic, Zeljko ^{[2
]}

Svetozarevic, Snezana ^{[3
]}

Rajakovic-Ognjanovic, Vladana ^{[1
]}

机构：

[1] Univ Belgrade, Fac Civil Engn, Bulevar kralja Aleksandra 73, Belgrade 11000, Serbia

[2] Univ Belgrade, Fac Technol & Met, Karnegijeva 4, Belgrade 11000, Serbia

[3] Univ Belgrade, Fac Philosophy, Dept Psychol, 18-20 Cika Ljubina St, Belgrade 11000, Serbia

来源：

SUSTAINABILITY | 2025年 / 17卷 / 03期

关键词：

cement replacement; lightweight concrete; solid waste management; wastewater sludge; sustainable solutions for cement-based composites; human factor in sustainable solutions; SEWAGE-SLUDGE; ASH; ATTITUDES; MANAGEMENT; BEHAVIORS; AGGREGATE; REUSE;

D O I：

10.3390/su17030945

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The requirement for high-quality drinking water and the treatment of wastewater prior to discharge into the environment results in the generation of sludge. As with any high-volume materials, beneficial reuse applications are being sought to promote sustainable environmental solutions. This research examined the possibilities of producing sustainable lightweight concrete using modified solidified wastewater sludge as a partial replacement of cement. Wastewater sludge was modified by the addition of aluminum oxide and magnesium silicate hydrate. The properties of the modified wastewater sludge were examined, as well as the influence of the partial cement replacement with the sludge in lightweight concrete. Besides testing the physical and mechanical properties of four mortar mixtures, an additional analysis of the willingness of final users to accept novel material containing wastewater sludge was addressed. The results obtained for the mortar samples indicate that 20% cement replacement is the upper limit for the modified sludge's application. The lightweight concrete prepared with the modified sludge (in the amount of 20%) was tested in a hardened state. The water permeability was reduced by 33.3% with the addition of the modified sludge. Both tested concrete mixtures showed good frost resistance. The maximal measured reduction in the compressive strengths was 7.6%. Citizens' perceptions and responses regarding the beneficial reuse of materials emphasize the importance of comprehensive education for their future acceptance.

引用

页数：25

共 59 条

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