A kind of manufacturing method of anti-radiation and anti-shrinkage hydraulic cementitious material

Abstract

The invention discloses a manufacturing method of a radiation-resistant anti-shrinking hydraulic gel material. Barite, strontianite, and camsellite tailings are taken as the raw material, and mixed into a conventional silicate raw material according to the barium-strontium-boron synergistic principle. Then the mixture is sintered, after the sinter cools down, a proper amount of gypsum is added into the sinter, and the mixture is pulverized to produce the radiation-resistant anti-shrinking hydraulic gel material. The material is widely applied to hospital / nuclear plant buildings with a radioactive source or civil buildings with high requirements, and the problems of shrinking and cracking of conventional silicate cement are solved. The problem that the expansion of a large amount of clinker hydrate causes the structural destruction or destructions on decoration is solved. The comprehensive utilization of barite, strontianite, and camsellite tailings is achieved. The sintering temperature is reduced by 100 to 150 DEG C. The goals of energy saving and energy consumption reduction can be achieved. At the same time the material has an anti-radiation performance. The long-term problems of short service life of conventional silicate cement and shrinkage caused by dryness are solved.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a kind of anti-radiation micro-expansion clinker obtained by sintering barite tailings, strontite, boormagnesite and silicate raw meal and its modification by using the clinker The invention discloses a method for manufacturing a radiation-resistant and shrinkage-resistant hydraulic gelling material obtained by grinding traditional silicate clinker. Background technique [0002] Due to the high content of tricalcium silicate and tricalcium aluminate in traditional Portland cement clinker, the water demand and heat of hydration are large during hydration, and the thermal stress and drying shrinkage after coagulation are relatively large, especially its thermal expansion. The coefficient reaches 2‰~3‰. When the concrete undergoes high and low temperature differences and freeze-thaw cycles, the concrete products will crack. With the harmful gases such as sulfur dioxide, s...

AI Technical Summary

Problems solved by technology

[0002] Due to the high content of tricalcium silicate and tricalcium aluminate in traditional Portland cement clinker, the water demand and heat of hydration are large during hydration, and the thermal stress and drying shrinkage after coagulation are relatively large, especially its thermal expansion. The coefficient reaches 2‰~3‰. When the concrete undergoes high and low temperature differences and freeze-thaw cycles, the concrete products will crack. With the harmful gases such as sulfur dioxide, sulfur trioxide, carbon dioxide and nitrogen dioxide in the air and their harmful The erosion of acid rain formed by gas has exacerbated the aging of Portland cement products. The repeated erosion of concrete projects in acid rain-prone areas is a clear evidence

Although there are dam cements with low thermal expansion coefficients, due to their narrow sintering range and difficulty in controlling their crystal forms, resulting in poor quality stability, high cost, and limited output, they cannot be widely used in common cement cements. industrial and civil buildings;

[0003] The traditional anti-radiation cement mainly includes barium cement, strontium cement and boron cement; the manufacturing method of barium cement is to use barite and clay as the main raw materials, and obtain clinker composed of dibarium silicate as the main mineral through calcination, and then mix It is made by adding appropriate amount of gypsum, but its thermal stability is poor and its strength is low, so it cannot be used as a structural engineering, especially because of its short service life and high cost; strontium cement is made by replacing all or part of strontium carbonate in Portland cement raw materials Limestone is calcined to obtain clinker composed of tristrontium silicate as the main mineral, which is ground by adding an appropriate amount of gypsum. Its performance is similar to that of barium cement, but its radiation resistance is slightly inferior to that of barium cement; while boron cement is made at high Boron-containing cement can be obtained by adding an appropriate amount of boronite and gypsum to the aluminum water clinker and grinding together, and its concrete products are used in neutron and thermal neutron protection and shielding projects;

[0004] In 2010, the scientific research team led by Professor Cheng Xin of Jinan University released the results of "Preparation Technology and Marine Engineering Application of Barium (Strontium) Calcium Sulfate Aluminate-based Special Cement" and won the National Second Prize. However, due to its high-sulfur alkali Compared with raw meal, it cannot be mass-produced in a decomposition kiln outside the kiln, and the cost is high, so it cannot be industrialized