| Summary: | Self-Consolidating Lightweight Foamed Concrete (SCLFC) is a combi-nation of two technology of concrete which is Self-Consolidating Concrete (SCC) and Lightweight Foamed Concrete (LFC). This SCLFC offers great potential for improved ease of positioning and scaled-down cost through reduced time and labour. Generally, a large amount of waste or paper sludge is generated every day from the paper industry and at the same time brings potential and devastating harmful impacts to the surroundings. For this reason, the search into the use of waste paper sludge ash (WPSA) in the SCLFC is looked into. This research aims to study the effect of the addition of WPSA concerning workability, strength, ultrasonic pulse velocity, porosity, and water absorption characteristics of SCLFC. The effect of the addition of WPSA in the range from 0 to 15% on the workability, strength physical, and absorption characteristics of SCLFC was established and compared to the normal SCLFC. The concrete specimens were subjected to strength at the age of 3, 7, and 28 days. The curing for this research is ambient conditions. The result indicated that the WPSA tends to be adding to the beneficial workability, strength, ultrasonic pulse velocity, porosity, and absorption characteristics of SCLFC. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.
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