Abstract: There is provided a cementitious mixture and method of making same. The cementitious mixture includes a cementitious material, aggregate and water. The cementitious mixture further includes a combination of fiber reinforcement, which includes a first amount of polymeric material fiber and a second amount of recycled polymeric fiber. According to embodiments, a relationship between the first amount of fiber and the second amount of fiber is defined by a ratio, wherein the ratio is between 1:7 and 7:1. The ratio of 1:7 is indicative of the total fiber in the cementitious mixture being 12.5% polymeric material fiber and 87.5% recycled polymeric fiber (RPF) and the ratio 7:1 is indicative of the total fiber in the cementitious mixture being 87.5% polymeric material fiber and 12.5% RPF fiber.

Abstract: The present invention relates to a polymer composition for forming fibers for reinforcement of cement-based composites, polymer fibers made from the composition and methods of making the polymer fibers. The polymer composition comprises an olefin polymer and a bonding agent comprising vinyl alcohol based polymer, a pozzolanic material or a combination thereof.

Abstract: Repair mortar and methods of preparing repair mortar are provided. The repair mortar comprise a cement binder, fine aggregate and cellulose fibrils. In some embodiments, the cellulose fibrils are dispersed uniformly throughout the repair mortar. In some embodiments, the cellulose fibrils comprise nanofibrillated cellulose and/or microfibrillated cellulose. In some embodiments, the cellulose fibrils comprise an aspect ratio of between about 20 to about 500. The methods comprise mixing a cement binder, fine aggregate with water/chemical admixture to provide a cementitious material of good consistency, mixing cellulose fibrils with water to provide a cellulose fibril slurry, and mixing the cellulose fibril slurry with the workable cementitious material. In some embodiments, the cellulose fibrils are dispersed uniformly throughout the workable cementitious material.

Abstract: The present invention relates to a polymer composition for forming fibers for reinforcement of cement-based composites, polymer fibers made from the composition and methods of making the polymer fibers. The polymer composition comprises an olefin polymer and a bonding agent comprising vinyl alcohol based polymer, a pozzolanic material or a combination thereof.

Abstract: The present invention relates to a polymer composition for forming fibers for reinforcement of cement-based composites, polymer fibers made from the composition and methods of making the polymer fibers. The polymer composition comprises an olefin polymer and a bonding agent comprising vinyl alcohol based polymer, a pozzolanic material or a combination thereof.

Abstract: A structural material composition comprises: a geopolymer matrix, the geopolymer matrix formed from an alumina silicate source and an alkaline activator; and an antibacterial agent (e.g. biocide and/or heavy-metal based antibacterial agent) encapsulated in an antibacterial agent carrier to form a first plurality of encapsulated antibacterial agent particles. The first plurality of encapsulated antibacterial agent particles is integrated with the geopolymer matrix during polymerization.

Abstract: A process for preparing a cellulosic pulp for use as an internal curing agent for a hydraulic cement-based composite material is disclosed. The process involves selecting a degree of refining of the cellulosic pulp to cause sufficient fibrillation to provide a change in water retention capacity for the cellulosic pulp while simultaneously limiting a decrease in dispersability within a mixture for forming the composite material due to excess fibrillation. The process also involves controlling refining of the cellulosic pulp using the selected degree of refinement to produce the cellulosic pulp internal curing agent.

Abstract: The present invention relates to a polymer composition for forming fibers for reinforcement of cement-based composites, polymer fibers made from the composition and methods of making the polymer fibers. The polymer composition comprises an olefin polymer and a bonding agent comprising vinyl alcohol based polymer, a pozzolanic material or a combination thereof.

Abstract: A concrete reinforcing member for admixture into a concrete composite. The concrete reinforcing member has a body extending in a longitudinal direction along an axis, the body having a lateral width. At least two anchor segments are axially spaced on the body, each anchor segment having at least one lateral extension projecting in a lateral direction along an associated plane that extends radially relative to the axis of the body. The associated plane of the lateral extension of one of the anchor segments is offset radially about the axis at an angle of greater than 0° and less than 90° relative to the associated plane of the lateral extension of the other anchor segment.

Abstract: A cement-based mixture comprises a polymeric fiber. The polymeric fiber may be obtained from a recycled vehicle tire. The cement-based mixture may comprise between 0.1% and 1.0% polymeric fiber by mass of cement. The cement-based mixture may comprise about 0.4% polymeric fiber by mass of cement. The cement-based mixture may be a mortar or a concrete. The polymeric fiber may be polyethylene-terephthalate.

Abstract: A concrete reinforcing member for admixture into a concrete composite. The concrete reinforcing member has a body extending in a longitudinal direction along an axis, the body having a lateral width. At least two anchor segments are axially spaced on the body, each anchor segment having at least one lateral extension projecting in a lateral direction along an associated plane that extends radially relative to the axis of the body. The associated plane of the lateral extension of one of the anchor segments is offset radially about the axis at an angle of greater than 0° and less than 90° relative to the associated plane of the lateral extension of the other anchor segment.

Abstract: Fiber additives for addition to proportioned concrete comprise a plurality of thermoplastic fibers having a profile geometry defined by the equation, ##EQU1## wherein the amplitude a.sub.0 falls within a range of from about 0.1 d.sub.f to 2.0 d.sub.f and the period .lambda. falls within a range of from about 2 d.sub.f to 15 d.sub.f for fibers having a diameter d.sub.f of from about 0.5 to about 1 mm; the peak pull-out stress .sigma..sub.peak and the specific pull-out energy absorbed to a maximal displacement of 7.5 mm .psi..sub.peak, both increase linearly with a deformity factor defined by the equation, ##EQU2## where .alpha.=0.8 and .beta.=-1, such that the peak pull-out stress is defined by the equation, ##EQU3## and the specific pull-out energy is defined by the equation, ##EQU4## the fiber additives having an optimimum deformity,D.sub.optimum .apprxeq.(0.5 to 1)D.sub.critical,D.sub.critical being that deformity where the ultimate tensile strength of the fiber equals k.sub.1 D.sub.

Abstract: An improved reinforcing fiber for concrete is formed with two types of anchors positioned adjacent to each axial end of the fiber. A drag anchor which frictionally resist being pulled from the concrete without fiber breakage and a dead anchor between the drag anchor and adjacent axial end of the fiber, the dead end engages the concrete to develop stresses at a weakened point in the fiber formed between the drag anchor and its adjacent dead anchor to break the fiber or deform the dead anchor before maximum tensile strength of the fiber is reached so that the dead anchor functions to maximize the load carrying capacity while at the same time protecting against fiber rupture and the drag anchor continues to function after release of the weak point of the fiber.

Abstract: A metal fiber for reinforcing cement-based materials comprises an elongated, substantially straight central portion and sinusoid shaped end portions. The sinusoid at each end portion has an optimum amplitude A.sub.o,opt defined by:A.sub.o,opt =[k.sub.1 (.sigma..sub.c).sup.k.sub.2 ][.sigma..sub.u.sup..alpha. .epsilon..sub.f.sup..beta. ][A.sub.f /P.sub.f ]wherek.sub.1 = 2.025.times.10.sup.-2,.sigma..sub.c =compressive strength of the cement-based material in MPa,k.sub.2 =3.19.times.10.sup.-1,.sigma..sub.u =ultimate tensile strength of the metal in MPa,.alpha.= 6.60.times.10.sup.-1,.epsilon..sub.f =ductility of the metal in percent, and.beta.= 3.20.times.10.sup.-1,A.sub.f =cross-sectional area of the fiber in mm.sup.2, andP.sub.f =perimeter of the fiber in mm.The sinusoid further has a wavelength L.sub.s defined by:L.sub.s =(L.sub.f -L.sub.m)/2whereL.sub.f =length of the fiber,L.sub.m =length of the central portion,and wherein 0.5 L.sub.f <L.sub.m <0.75 L.sub.f.