초록 ▼

Pulp fibers derived from wood or non-wood plants or recycled paper products, which are 0.1-30 mm long and about 0.001-0.1 mm in equivalent diameter, are individualized by mechanical action, blended with at least one of the dry ingredients of the cement-based material and then mixed with the remainin

Pulp fibers derived from wood or non-wood plants or recycled paper products, which are 0.1-30 mm long and about 0.001-0.1 mm in equivalent diameter, are individualized by mechanical action, blended with at least one of the dry ingredients of the cement-based material and then mixed with the remaining ingredients of conventional cement-based mixtures using conventional mixing equipment for effectively improving fresh and hardened properties of cement-based materials. Dispersion is achieved by individualizing the plant pulp fibers by mechanical action, and further by blending the individualized fibers with at least one of the dry ingredients of the mix and then with the remaining ingredients of the cement-based material, with fibers added at relatively low dosages of about 0.3-30 kg per cubic meter. The affinity of plant pulp fibers for water facilitates their dispersion in conventional cement-based mixtures. Fresh mixtures of cement-based materials incorporating the dispersed individualized plant pulp fibers possess desirable workability, resistance to segregation and bleeding, pumpability, finishability, and reduced rebound when pneumatically applied. Hardened cement-based materials incorporating the dispersed individualized plant pulp fibers provide improved crack resistance, toughness characteristics, impact resistance, fatigue life, abrasion resistance, and other mechanical, physical and durability characteristics. Plain and reinforced concrete and shotcrete as well as precast and cast-in-place concrete, plaster and stucco, mortar, grout and flowable fill are examples of cement-based materials which can benefit from the improvements in fresh and hardened material properties rendered by dispersed plant pulp fibers.

대표청구항 ▼

[ We claim:] [1.] A process of making cellulose fiber reinforced cement-based material using cellulose pulp derived through at least one of mechanical, thermal and chemical pulping methods from at least one of softwood, hardwood, and non-wood plants, the process comprising the steps of:a. drying the

[ We claim:] [1.] A process of making cellulose fiber reinforced cement-based material using cellulose pulp derived through at least one of mechanical, thermal and chemical pulping methods from at least one of softwood, hardwood, and non-wood plants, the process comprising the steps of:a. drying the wet cellulose pulp resulting from the pulping methods under conditions to achieve a dried fluff pulp with low fiber-to-fiber bonding therein;b. using mechanical action to break fiber-to-fiber bonds and produce substantially individual fibers;c. mixing the dried pulp with at least one of dry ingredients of the cement-based material which include cement, aggregates, and chemical, mineral, polymeric and air-entraining admixtures to produce a premix;d. adding the said premix to the remaining ingredients of the cement-based material to reach a fiber dosage ranging from about 0.3-30.0 kg per cubic meter, said cement-based material further including about 50-1500 kg per cubic meter of cementitious material, about 50-1000 kg per cubic meter of water, and about 100-3600 kg per cubic meter of aggregate; ande. mixing the cement-based material incorporating fibers so as to disperse the fibers uniformly throughout the cement-based material.