As much as 4.8 million tons of construction sludge is dumped each year, the highest among construction wastes. One of the potential technologies for remanufacturing construction materials such as light-weight aggregates (LWAs) and/or drainage materials from construction sludge is sintering. However, the need for a stationary large-scale plant has not been conductive to the commercialization of sintering processes. In this work, a fundamental experiment investigation was conducted into the on -site manufacture of pellets from dehydrated construction sludge cake by using a simple down-flow sintering furnace (SDSF). Test a results obtained with an electric furnace showed that pellets sintered at above 600degreesC did not have a water dissolving tendency and those sintered at above 900degreesC were as hard as commercially available artificial LWA, due to their reduced micro-pore volume and the formation of eutectic crystals. At sintering temperatures higher than 1,100degreesC, however,pellets adhered to each other. When the optimal sintering temperature was set as 1,000degreesC, products from the SDSF were found to have the same performance as the commercial artificial LWAs, showing the potetial utility of the proposed simple on-site SDSF sintering.