Miscellaneous fiber reinforced cement-base composite moterial without plastic cracking

Abstract

The present invention belongs to the field of material science and engineering technology, and is one kind of miscellaneous fiber reinforced cement-base composite material without plastic cracking. The miscellaneous fiber consists of organic synthetic fiber and inorganic fiber, has excellent reducing and inhibiting effect on plastic shrinkage cracking of cement-base material from initial solidification to final solidification and can reduce plastic crack by over 80 %. Compared with single fiber, the miscellaneous fiber has 20-60 % raised plastic crack reducing effect. The present invention may be used widely in cement-base material engineering, such as cement concrete road, bridge surface, terrace, revetment, dam and other engineering, to raise engineering quality.

Description

technical field [0001] The invention belongs to the field of material science and engineering science and technology, and in particular relates to a hybrid fiber cement-based composite material (cement paste, mortar, concrete and composite materials thereof) that prevents plastic shrinkage and cracking. Background technique [0002] Concrete is one of the largest and most widely used building materials in the world. At present, my country's annual concrete consumption has reached about 1 billion cubic meters. It is estimated that by 2010, my country's cement output will increase to 800-850 million tons, which is almost double the 490 million tons in 1996, and the corresponding concrete consumption will also increase. increased badly. Therefore, it can be affirmed that concrete will still be the main building material of modern engineering construction in our country for a long period of time in the future. Moreover, because it has the advantages of wide application range, c...

AI Technical Summary

Problems solved by technology

For cement-based materials, the early shrinkage cracking often includes the loss of water shrinkage in the plastic stage and the drying shrinkage in the early stage of hardening, so it is not complete to use synthetic fibers to prevent cracking of cement-based materials.

For inorganic fiber materials, although its modulus of elasticity is higher than that of cement-based materials, different inorganic fiber materials also have some shortcomings. For example, the diameter of steel fibers is not easy to make very thin, and the crack reduction effect of synthetic fibers needs to be increased several times. Fiber content; glass fiber, ceramic fiber, mineral fiber and other inorganic non-metallic fibers generally have small ultimate tensile deformation, which cannot adapt to the situation of large shrinkage deformation in the plastic stage, and the price of synthetic fiber per unit volume is much higher than Inorganic fiber