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Preparation method of anti-freezing cement mortar with rice husk ash and silica fume

A technology for cement mortar and rice husk ash, which is applied in sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of insufficient frost resistance and durability of cement mortar, so as to solve the problem of frost resistance and improve durability. Strength, frost resistance, and effect of increasing specific surface area

Inactive Publication Date: 2019-05-24
NORTHEAST FORESTRY UNIVERSITY
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of insufficient frost resistance and durability of the existing cement mortar, and to provide a preparation method for double-doped rice husk ash and silica fume antifreeze cement mortar, which fully utilizes rice husk ash and silica fume , the prepared cement mortar can significantly improve the frost resistance durability of concrete materials in cold regions

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  • Preparation method of anti-freezing cement mortar with rice husk ash and silica fume

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specific Embodiment approach 1

[0024] Specific embodiment 1: This embodiment records a method for preparing antifreeze cement mortar with double mixing of rice husk ash and silica fume. The specific steps of the method are as follows:

[0025] Step 1: High-temperature calcination: Place the natural rice husk in a muffle furnace and calcine at 800°C for 2 hours to obtain rice husk ash;

[0026] Step 2: Ball milling: Put the rice husk ash obtained in Step 1 into a planetary ball mill tank and equip it with steel balls, and mill it at a speed of 300r / min for 2h;

[0027] Step 3: Proportioning: take materials according to weight fraction, 100 parts of cement, 8.33 parts of rice husk ash obtained in step 2, 16.67 parts of silica fume, 375 parts of standard sand, and 62.5 parts of water;

[0028] Step 4: Mixing and stirring: Add water, cement, rice husk ash, silica fume, and standard sand to the mixing pot in sequence, and mix evenly to obtain a mixture;

[0029] Step 5: Vibration: Pour the mixture obtained in step 4 into ...

specific Embodiment approach 2

[0031] Specific embodiment two: the preparation method of double-mixed rice husk ash and silica fume antifreeze cement mortar described in specific embodiment 1, in step 2, the added amount of rice husk ash accounts for 75% of the volume of the planetary ball mill tank %.

specific Embodiment approach 3

[0032] Specific embodiment three: The preparation method of a double-mixed rice husk ash and silica fume antifreeze cement mortar described in specific embodiment 1, in step 2, the steel balls are composed of 200 large balls with a diameter of 10 mm and 1,000 It consists of a small ball with a diameter of 6mm.

[0033] Specific embodiment four: the preparation method of a double-mixed rice husk ash and silica fume antifreeze cement mortar described in specific embodiment 1, in step four, the mixing and stirring are specifically: first putting water into a mixing pot , Then add cement, rice husk ash and silica fume, mix at low speed for 30s; then pour standard sand into the mixing pot, stir at low speed for 30s while pouring, clean the mortar on the blades and pot wall; finally, mix at high speed for 30s; The low-speed rotation speed described in the above two places is 140 r / min and 62 r / min; the high-speed rotation speed is 285 r / min and 125 r / min.

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Abstract

The invention belongs to the technical field of manufacture of building materials in cold regions, relates to a preparation method of anti-freezing cement mortar with rice husk ash and silica fume, and is intended to solve the problem that existing cement mortar has insufficient anti-freezing capacity and durability. The preparation method comprises the steps of calcining at a high temperature; performing ball milling; proportioning; mixing; vibrating; steam-curing at a high temperature. The preparation method has the advantages that rich husk ash and silica fume as industrial and agriculturalbyproducts contain massive active SiO2 and may be used as mineral admixtures to replace cement so that usage of building cement can be effectively reduced, with emission of CO2 upon cement productionreduced; therefore, waste is turned into wealth, energy is saved, and environment is protected; the rice husk ash is calcined at 800 DEG C, the interior network structure can be broken, and therefore, the finished material has greatly enlarged specific surface area, with the quantity of active SiO2 in the finished material also increased.

Description

technical field [0001] The invention belongs to the technical field of building material manufacturing in cold regions, and in particular relates to a preparation method of antifreeze cement mortar double-doped with rice husk ash and silica fume. Background technique [0002] In the northeast, northwest and some cold regions of North my country, the freeze-thaw cycle is the most serious durability problem faced by concrete structural engineering. Freezing and thawing cycles will cause damage to the interior of the concrete material, deteriorating mechanical properties such as strength and deformation capacity, so that the structure gradually loses its bearing capacity. From the material point of view, improving the frost resistance of cement mortar is the key to solve the durability of concrete structures in cold regions. Contents of the invention [0003] The purpose of the present invention is to solve the problem of insufficient frost resistance and durability of the e...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B18/10C04B18/14C04B111/20
CPCY02W30/91
Inventor 辛大波孙铭邹超英
Owner NORTHEAST FORESTRY UNIVERSITY
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