JIS A 5031:2016 PDF Download

JIS A 5031:2016 is a standard that specifies the requirements for melt-solidified slag aggregate for concrete derived from municipal solid waste and sewage sludge. The standard outlines the manufacturing process, characteristics, and application of the melt-solidified aggregate.

The melt-solidified aggregate is produced by melting municipal solid waste, sewage sludge, and their burned ashes at a temperature of at least 1200°C and then cooling and solidifying them. This aggregate is intended for efficient utilization of waste materials in melt-solidifying facilities.

The standard includes different types of melt-solidified slag aggregate, such as those produced in private melt-solidifying facilities entrusted by municipal authorities or those subjected to magnetic selection and particle size adjustment.

The application of the melt-solidified aggregate is specified in the standard. It can be used for concrete with a design standard strength of 35 N/mm2 or lower and a water-cement ratio of 55% or smaller to ensure durability. It can also be used for precast concrete products with a design standard strength higher than 35 N/mm2, under specific conditions and requirements specified by the purchaser.

However, the melt-solidified aggregate cannot be used for prestressed concrete applications or precast concrete used for certain critical parts of buildings, including foundations, principal structural parts, and parts related to safety, fire prevention, or hygiene.