Research On The Plastic Shrinkage Of Fiber Concrete

The concrete is the civil engineering most main material, it follows the engineering construction to need to progress with the science and technology development. At present, as a result of the admixture technology progress, the configuration intensity high, the work related good concrete is no longer difficult. The concrete intensity and the fluidity all can be able to give dual attention to, at the same time the project quality and the speed can enhance. But concrete inherent weakness is the brittle material, has the low tensile strength and the strain, easy to produce the crack because of brittleness. Expands along with the crack can create the performance depression, so that causes the loss of life; When structural design because of the crack opening limit, the excel in building material superiority cannot obtain the full application. Therefore the modern concrete except must achieve high resistant to compression, requests and so on outside Gao Kangla, but also must easy construct, and can the long-term maintenance excel in, toughness, high impervious and so on the performance, this has caused the high performance concrete appearance, the textile fiber concrete is arises at the historic moment in the concrete modified process.The textile fiber concrete development begins in at the beginning of for the 20th century, especially develops most by the steel textile fiber concrete research and the application early and most widespread. At present, the steel textile fiber concrete entered the commercialization production base. Looked on our country to the textile fiber concrete research that, starts in the 70's, and already in the water conservation, the war industry, the transportation, the building, the mining and metallurgy unit and the universities, colleges and institutes carried on the textile fiber concrete mixture ratio, strengthened the mechanism, the physical mechanics performance and so on the productive research work, enabled the textile fiber concrete to apply in the actual project. Looked on at present that, the textile fiber concrete, the steel textile fiber concrete is in particular most successful in project application, such as bridge floor surface coating and structure, road, ground, street and runway and so on. Besides the steel textile fiber, the carbon fiber, the glass fiber, the polypropylene textile fiber, the nylon fiber has also won initial success in concrete application.The continual basalt textile fiber is one kind of new inorganic fibrous material, because it has thermostable, anti-corrosive, the acidproof alkalinity can strong, bear chemistry performance good and the thermostability superior and so on the merits, does intentionally has the very good prospects for development for the construction industry enhancement compound materials.The research indicated that, mixes in the textile fiber to improve the concrete dehiscence to have the remarkable effect, because the textile fiber concrete has in many structure merits, assumes the three dimensional uniform distribution in the concrete, causes the concrete the stress in the structural material lateral section and a length direction evener disperser, has avoided the stress concentration, therefore can reduce the crack or impediment crack extending effectively with the expansion, so long as mixes in the quantity few textile fibers to be able to reduce the concrete obviously the dehiscence.The experiment indicated that, after in the concrete mixes in the textile fiber the curving performance to strengthen, the anti-booklet intensity enhances, causes the member in bending the bearing capacity large scale enhancement. The textile fiber has the anti- crack, the enhancement, the plasticizing function in the textile fiber concrete to the substrate.The anti- crack function is refers to the textile fiber after to mix the concrete early time contraction crack and the hardened contraction crack newly produces with the expansion hindrance function.The textile fiber has the anti- crack, the enhancement, the plasticizing function in the textile fiber concrete to the substrate.The anti- crack function is refers to the textile fiber after to mix the concrete early time contraction crack and the hardened contraction crack newly produces with the expansion hindrance function. The textile fiber to the substrate enhancement function, mainly for to the tensile strength enhancement, correspondingly, take the main tension as the control destruction, like curved pulls the intensity (to call anti-booklet intensity, breaks off module), the shearing strength and so on also along with it enhancement. When the high elasticity module textile fiber content is high, the textile fiber concrete compressive strength also has the distinct enhancement.Material toughness usually refers to the material to enter the plastic stage under each kind of stressful condition to maintain certain resisting force distortion ability.The textile fiber concrete most major characteristic lies in the tough remarkable improvement.This article has performed the systematic experiment and the fundamental research to the textile fiber concrete anti-plastic shrinkage performance, the research thought in the concrete mixes in the textile fiber to be possible to suppress the concrete effectively the plastic cracking, may enhance the concrete large scale the durability. But because the coagulation soil constituent is complex, affects the factor extremely numerous, the structure ever changing, in addition testing method and the experimental time limit as well as the research content complexity, the present research also has certain limitation, the textile fiber enhances the degree to the concrete lasting quality not to be able to carry on the quantification, therefore waits for the further research and the exploration.