Water-containing fluid transport pipe and transport method for water-containing fluid

A method of producing a fresh concrete set, the method comprising:

• pressure-feeding fresh concrete within a pipe for pressure-feeding fresh concrete, wherein
• the fresh concrete set includes a series of fresh concretes which are pressure-fed for at least part of a period of time from start of the pressure feeding until finish of the pressure feeding;
• the pipe comprises an innermost layer formed on at least an inner surface of the pipe, the innermost layer including a material that has a water absorption rate of equal to or less than 0.2% by mass and a thermal conductivity of equal to or less than 10 W/m·K;
• a time from the start of the pressure feeding until the finish of the pressure feeding is divided into four equal phases, and the phases are referred to as first to fourth phases in time order;
• a fresh concrete which finishes being pressure-fed and is discharged from the pipe at an intermediate point of the second phase is referred to as a fresh concrete at the intermediate point of the second phase;
• a fresh concrete which finished being pressure-fed and is discharged from the pipe at an intermediate point of the third phase is referred to as a fresh concrete at the intermediate point of the third phase;
• a mass of an aggregate per unit volume of the fresh concrete at the intermediate point of the second phase is equal to or greater than 90% by mass and equal to or less than 110% by mass of a mass of an aggregate per unit volume of a fresh concrete before being pressure-fed;
• a mass of an aggregate per unit volume of the fresh concrete at the intermediate point of the third phase is equal to or greater than 90% by mass and equal to or less than 110% by mass of a mass of an aggregate per unit volume of a fresh concrete before being pressure-fed;
• and
• the fresh concrete at the intermediate point of the second phase and the fresh concrete at the intermediate point of the third phase have a strength after one week measured according to JIS A 1108 of equal to or greater than 16 N/mm2, or the fresh concrete at the intermediate point of the second phase and the fresh concrete at the intermediate point of the third phase have a strength after four weeks measured according to JIS A 1108 of equal to or greater than 24 N/mm2.

A method of suppressing variations in a composition and a quality between

• a series of fresh concretes in a fresh concrete set obtained by a method of producing a fresh concrete set and
• a fresh concrete after being prepared and before being pressure-fed,
• the method of producing comprising:
• pressure-feeding fresh concrete within a pipe for pressure-feeding fresh concrete, wherein
• the fresh concrete set includes a series of fresh concretes which are pressure-fed for at least part of a period of time from start of the pressure feeding until finish of the pressure feeding;
• and
• the pipe comprises an innermost layer formed on at least an inner surface of the pipe, the innermost layer including a material that has a water absorption rate of equal to or less than 0.2% by mass and a thermal conductivity of equal to or less than 10 W/m·K.

A method of suppressing variations in a composition and a quality between a fresh concrete which is previously pressure-fed and a fresh concrete which is later pressure-fed in a series of fresh concretes in a fresh concrete set obtained by a method of producing a fresh concrete set,

• the method of producing comprising:
• pressure-feeding fresh concrete within a pipe for pressure-feeding fresh concrete, wherein
• the fresh concrete set includes a series of fresh concretes which are pressure-fed for at least part of a period of time from start of the pressure feeding until finish of the pressure feeding;
• and
• the pipe comprises an innermost layer formed on at least an inner surface of the pipe, the innermost layer including a material that has a water absorption rate of equal to or less than 0.2% by mass and a thermal conductivity of equal to or less than 10 W/m·K.