Method for reducing volume shrinkage of inorganic polymer binding material
An inorganic polymer and cementitious material technology, applied in cement production and other directions, can solve the problem of inorganic polymer cement shrinkage cracking, which has not been well solved, the volume change of inorganic polymer cementitious materials is also less studied, and the setting time Too short and other problems, to achieve the effect of improving volume stability and durability, improving volume stability, saving natural resources and energy
Active Publication Date: 2017-04-26
GUANGDONG RES INST OF WATER RESOURCES & HYDROPOWER
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During the research process, it was also found that this type of cementitious material has some problems: such as too short setting time, pan-alkali, cracking and ash, etc.
Among them, the first two problems can be solved by adjusting the modulus of the activator or adding admixtures and proper maintenance, but the shrinkage and cracking of inorganic polymer cement has not been well resolved. For the study of volume change of inorganic polymer cementitious materials also less
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[0030] The shrinkage compensating admixture is added to the inorganic polymer gelling material, and the dosage of the admixture in the inorganic polymer is 4%, 6% and 8% respectively. The ratio of activated magnesia and nano silicon dioxide in the admixture is 1:1, wherein the activity of activated magnesia is 40s, the content of magnesia in activated magnesia is 95wt%, and the median diameter of nano silicon dioxide is 50nm. Mix the admixture with the inorganic polymer evenly, add water and mix to prepare a slurry, and test its autogenous shrinkage, chemical shrinkage and drying shrinkage respectively. At the same time, no shrinkage-compensating admixture is added to the inorganic polymer gelling material as a comparative example, that is, the admixtures in the inorganic polymer are respectively 0%. See the attached graph for the curves of the autogenous shrinkage of different dosages figure 1 , the curves of chemical shrinkage effects of different dosages are shown in the a...
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The invention discloses a method for reducing volume shrinkage of an inorganic polymer binding material. The method includes the steps that a shrinkage-compensating additive is added into the inorganic polymer binding material, the materials are mixed to be uniform, and water is added; the shrinkage-compensating additive is formed by mixing high-activity magnesium oxide and nanosilicon dioxide. By means of the method, volume shrinkage of inorganic polymer hardened paste is remarkably relieved while the strength of an inorganic polymer is guaranteed, and great scientific value is achieved for improving the volume stability and durability of a cement-based material. Very great significance is achieved for efficiently utilizing slag, coal ash and other industrial waste residues for producing the inorganic polymer binding material with high strength and good volume stability, protecting the environment and achieving sustainable development of the society.
Description
technical field [0001] The invention relates to a method for reducing the volume shrinkage of an inorganic polymer gelling material, which belongs to the field of civil engineering materials. Background technique [0002] In civil engineering, all substances that can cement other solid materials into a whole and have a certain mechanical strength through a series of physical and chemical changes are collectively referred to as cementitious materials. At present, the cementitious material commonly used in civil engineering is Portland series cement. However, Portland cement is produced through the process of "two grindings and one burning", which consumes a lot of energy and emits a lot of CO 2 and dust, so, looking for other more environmentally friendly and energy-saving gelling materials has always been a research hotspot in this field. Inorganic polymer gelling material is a kind of environmentally friendly new gelling material, which is composed of alkaline activator a...
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Login to View More IPC IPC(8): C04B12/00C04B7/153C04B7/24
CPCC04B7/1535C04B7/243C04B12/005Y02P40/10
Inventor 李兆恒杨永民陈晓文张君禄王立华蔡杰龙
Owner GUANGDONG RES INST OF WATER RESOURCES & HYDROPOWER