Fiber for reinforcing cement, and cured cement produced using same
A cement reinforcing fiber of the present invention is a cement reinforcing fiber made of a polyolefin fiber, wherein a fiber treating agent is adhered to a surface of the polyolefin fiber, and the fiber treating agent is a polyoxyethylene alkyl phosphoric ester salt. One preferred polyoxyethylene alkyl phosphoric ester salt is a compound represented by chemical formula (2) below. A cured cement of the present invention contains the above-described cement reinforcing fiber. In the chemical formula (2) above, R is an alkyl group with a carbon number of 2 to 20, A is an alkali metal element, and n is 1 to 20.
1. A cement reinforcing fiber made of a polyolefin fiber,
wherein a fiber treating agent containing a polyoxyethylene alkyl phosphoric ester salt in an amount of 90 mass % or more is adhered to a surface of the polyolefin fiber, and
the polyoxyethylene alkyl phosphoric ester salt is at least one compound selected from the group consisting of a compound represented by chemical formula (2) below and a compound represented by chemical formula (3) below:
where in the chemical formula (2), R is an alkyl group with a carbon number of 2 to 20, A is an alkali metal element, and n is 1 to 20; and
where in the chemical formula (3), R 1 and R 2 are an alkyl group with a carbon number of 2 to 20, A is an alkali metal element or an alkaline-earth metal element, and n and m are 1 to 20.
2. The cement reinforcing fiber according to claim 1 , wherein an adhesion amount of the polyoxyethylene alkyl phosphoric ester salt is in a range of 0.1% to 5% by mass based on 100% by mass of the polyolefin fiber.
3. The cement reinforcing fiber according to claim 2 , wherein the polyolefin fiber is hydrophilized through at least one hydrophilization treatment selected from a fluorine gas treatment, a plasma discharge treatment, and a corona discharge treatment.
4. The cement reinforcing fiber according to claim 1 , wherein the polyolefin fiber is hydrophilized through at least one hydrophilization treatment selected from a fluorine gas treatment, a plasma discharge treatment, and a corona discharge treatment.
5. The cement reinforcing fiber according to claim 1 ,
wherein n in the polyoxyethylene alkyl phosphoric ester salt represented by the chemical formula (2) is 1 to 15, and
n and m in the polyoxyethylene alkyl phosphoric ester salt represented by the chemical formula (3) are 1 to 15.
6. A cured cement comprising a cement reinforcing fiber made of a polyolefin fiber,
wherein a fiber treating agent is adhered to a surface of the polyolefin fiber,
the fiber treating agent is a polyoxyethylene alkyl phosphoric ester salt, and
the polyoxyethylene alkyl phosphoric ester salt is at least one compound selected from the group consisting of a compound represented by chemical formula (2) below and a compound represented by chemical formula (3) below:
where in the chemical formula (2), R is an alkyl group with a carbon number of 2 to 20, A is an alkali metal element, and n is 1 to 20; and
where in the chemical formula (3), R 1 and R 2 are an alkyl group with a carbon number of 2 to 20, A is an alkali metal element or an alkaline-earth metal element, and n and m are 1 to 20.
7. The cured cement according to claim 6 , wherein an adhesion amount of the polyoxyethylene alkyl phosphoric ester salt is in a range of 0.1% to 5% by mass based on 100% by mass of the polyolefin fiber.
8. The cured cement according to claim 7 , wherein the polyolefin fiber is hydrophilized through at least one hydrophilization treatment selected from a fluorine gas treatment, a plasma discharge treatment, and a corona discharge treatment.
9. The cured cement according to claim 6 , wherein the polyolefin fiber is hydrophilized through at least one hydrophilization treatment selected from a fluorine gas treatment, a plasma discharge treatment, and a corona discharge treatment.
10. The cured cement according to claim 6 ,
wherein n in the polyoxyethylene alkyl phosphoric ester salt represented by the chemical formula (2) is 1 to 15, and
n and m in the polyoxyethylene alkyl phosphoric ester salt represented by the chemical formula (3) are 1 to 15.