Abstract: To provide a process for producing a fluoroalkyl iodide, whereby the selectivity for a fluoroalkyl iodide having a desired degree of polymerization is high and the productivity is high. A process for producing a fluoroalkyl iodide (2) represented by RfCF2CF2I (wherein Rf is a fluoroalkyl group having at most 4 carbon atoms), which comprises reacting a fluoroalkyl iodide (1) represented by RfI with tetrafluoroethylene in the presence of a radical initiator, wherein a first reaction step of supplying and reacting tetrafluoroethylene and a radical initiator to the fluoroalkyl iodide (1), is followed by repeating (n?1) times (provided that n is an integer of at least 3) a subsequent reaction step of supplying and reacting a radical initiator, or a radical initiator and tetrafluoroethylene, to a reaction mixture (1) formed in the first reaction step.

Abstract: A filler for reinforcement joint that ensures excellent fluidity and retention thereof, exhibiting appropriate length change ratio and high strength performance; and a method of reinforcement joint filling operation using the same. There are provided a filler for reinforcement joint containing a cement, an expanding material, a pozzolana micropowder, a water reducing agent and a sand, and a method of reinforcement joint filling operation using the same, characterized in that the expanding material is a calcium aluminoferrite expanding material, and that the pozzolana micropowder is a silicious micropowder having a silicon dioxide (SiO2) content of 90% or higher and having a hydrogen ion concentration falling in an acid region, and that the water reducing agent is a polycarboxylic acid water reducing agent. The calcium aluminoferrite expanding material preferably has a value of Brain specific surface area of 2000 to 6000 cm2/g. The sand is preferably a weighty sand of 3.0 g/cm3 or higher density.

Abstract: A filler for reinforcement joint that ensures excellent fluidity and retention thereof, exhibiting appropriate length change ratio and high strength performance; and a method of reinforcement joint filling operation using the same. There are provided a filler for reinforcement joint containing a cement, an expanding material, a pozzolana micropowder, a water reducing agent and a sand, and a method of reinforcement joint filling operation using the same, characterized in that the expanding material is a calcium aluminoferrite expanding material, and that the pozzolana micropowder is a silicious micropowder having a silicon dioxide (SiO2) content of 90% or higher and having a hydrogen ion concentration falling in an acid region, and that the water reducing agent is a polycarboxylic acid water reducing agent. The calcium aluminoferrite expanding material preferably has a value of Brain specific surface area of 2000 to 6000 cm2/g. The sand is preferably a weighty sand of 3.0 g/cm3 or higher density.