Bamboo pulp cellulosic fiber/hydrated magnesium silicate based composite and preparation method thereof

Abstract

The invention discloses a bamboo pulp cellulosic fiber / hydrated magnesium silicate based composite and a preparation method thereof. The bamboo pulp cellulosic fiber / hydrated magnesium silicate basedcomposite comprises, by weight, 4-16 parts of bamboo pulp cellulosic fiber, 33.6-55 parts of magnesium oxide, and 37.8-60 parts of silica ash. According to the bamboo pulp cellulosic fiber / hydrated magnesium silicate based composite, the bamboo pulp cellulosic fiber serves as a reinforced phase of the magnesium silicate based composite, and the bending strength and fracture toughness of the composite are improved; meanwhile, the pH value of a magnesium silicate matrix is lower than that of Portland cement, the influence of the alkalinity on fiber degradation can be reduced, the fiber in the composite can achieve the long-term reinforcement effect, and the durability is improved. Moreover, magnesium oxide is rich in reserves and excellent in performance. The bamboo pulp fiber is short in growth cycle, high in yield, green and renewable. The bamboo pulp cellulosic fiber / hydrated magnesium silicate based composite and the preparation method thereof provide a new approach to utilization ofbamboo fiber and magnesium oxide. The prepared bamboo pulp cellulosic fiber / hydrated magnesium silicate based composite has the advantages of high strength, high fracture toughness, light weight, lowalkalinity and the like, and follow the concept of sustainable development of a building material.

Description

technical field [0001] The invention belongs to the technical field of fiber-reinforced building materials, and in particular relates to a bamboo pulp cellulose fiber / hydrated magnesium silicate-based composite material and a preparation method thereof. Background technique [0002] As a reinforcing phase, fiber can not only improve the mechanical properties of cement-based materials and other building materials, but also endow materials with new functions and uses, and has become one of the effective ways to strengthen building materials. However, steel fibers are prone to rust, the production process of polypropylene fibers is not environmentally friendly and uneconomical, and glass wool dust and asbestos may cause diseases and endanger health. Due to its low cost, abundant availability, environmental friendliness, wide range of sources, renewable, and degradable properties, plant fibers have shown great potential in replacing synthetic fibers and steel fibers, which has a...

AI Technical Summary

Problems solved by technology

A commonly used cementitious material is Portland cement with calcium silicate as the main component, but its production process consumes a lot of energy and the process is complicated. The most important thing is that its pore solution has a high alkalinity with a pH greater than 12. property, which, as mentioned earlier, greatly affects the durability of plant fibers in a Portland cement matrix

In addition, magnesium oxychloride cement and phosphate cementitious materials are also relatively common cementitious materials, but magnesium oxychloride cement is easy to return halogen and catalyze, has poor water resistance, is easy to warp and deform, and is also prone to frosting and whitening

As for phosphate cementitious materials, its coagulation speed is too fast, its impact resistance is poor, and its strength will shrink when it is in contact with water for a long time. In addition, the global phosphorus resources are scarce, and its cost is relatively expensive. Many factors limit its practical application.

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