Preparation technology of nanometer SiO2 composite cement

Abstract

The invention belongs to the field of building industry, in particular to a preparation technology of nanometer SiO2 composite cement, which mainly provides the technology for preparing nanometer SiO2 from agricultural waste rice hulls at low price and preparing ultrahigh-intensity and ultrahigh-durability nanometer SiO2 composite cement through mixing the nanometer SiO2 into the cement materials. The preparation technology is characterized in that the problems of high cost and difficult nanometer material dispersion of the nanometer SiO2 preparation in the prior art can be solved, and the prepared SiO2 composite cement has incomparable excellent performance compared with other cement materials.

Description

technical field

[0001] The technical invention relates to a nano-SiO 2 The preparation technology of composite cement belongs to the field of building materials industry, and is mainly used in the production of special cement with ultra-high strength and ultra-high durability. technical background

[0002] The application of nanotechnology to the improvement of cement is expected to further improve the microstructure of cement, so as to significantly improve its physical and mechanical properties and durability. Nano-materials are used in cement research. Nano-mineral powder can not only fill the fine gaps between cement pastes, improve the accumulation effect of such materials, and accelerate the curing rate of cement; it can also exert the surface effect and small size effect of nanoparticles, The bonding strength of cement is obviously improved.

[0003] nano-SiO 2 Due to its special structural level, it has the effect of modifying many materials (including concrete, e...

Examples

Embodiment (1

[0020] Implementation example (1): nano-SiO in rice husk 2 extraction of

[0021] The rice husk is pretreated, first washed with water and then pickled to remove the soil and other dirt attached to the surface of the rice husk to ensure that the prepared SiO 2 Has high purity. Put the pretreated rice husk into the incinerator, first raise the temperature in the furnace to 100°C in an open state and keep it warm for 1 hour, then close the furnace door, raise the temperature to 500-600°C and incinerate for 2~ 3h. The incinerator has an incineration container. There are many small holes distributed on the bottom plate of the container. There are heat exchange water pipes and gas exchangers distributed in the container. The incineration temperature in the rice husk is controlled by adjusting the distribution density of the heat exchange water pipes and the gas flow rate. The circulation of the rice husk ensures the full combustion of the rice husk, and at the same time, the hea...

Embodiment (2

[0022] Implementation example (2): preparation of nano-SiO 2 composite cement

[0023] Grind cement materials and slag into superfine mineral powder, and use the incineration heat derived from rice husk to dry at 60-80°C. nano-SiO 2 Dry and disperse evenly in ultra-fine cement mineral powder according to the mass percentage content in Table 1.

[0024] Table 1 Nano-SiO 2 Modified cement flexural strength, compressive strength

[0025]

[0026] As shown in the table above, doped with nano-SiO 2 It can significantly improve the early flexural strength and compressive strength of concrete, and improve the performance of cement. 3% Nano SiO 2 With the optimum dosage, the flexural strength of the modified cement increases by about 54.9% to 62.8%; its compressive strength increases by about 45.5% to 54.9%.

technical field

[0001] The technical invention relates to a nano-SiO 2 The preparation technology of composite cement belongs to the field of building materials industry, and is mainly used in the production of special cement with ultra-high strength and ultra-high durability. technical background

[0002] The application of nanotechnology to the improvement of cement is expected to further improve the microstructure of cement, so as to significantly improve its physical and mechanical properties and durability. Nano-materials are used in cement research. Nano-mineral powder can not only fill the fine gaps between cement pastes, improve the accumulation effect of such materials, and accelerate the curing rate of cement; it can also exert the surface effect and small size effect of nanoparticles, The bonding strength of cement is obviously improved.

[0003] nano-SiO 2 Due to its special structural level, it has the effect of modifying many materials (including concrete, e...

Examples

Embodiment (1

[0020] Implementation example (1): nano-SiO in rice husk 2 extraction of

[0021] The rice husk is pretreated, first washed with water and then pickled to remove the soil and other dirt attached to the surface of the rice husk to ensure that the prepared SiO 2 Has high purity. Put the pretreated rice husk into the incinerator, first raise the temperature in the furnace to 100°C in an open state and keep it warm for 1 hour, then close the furnace door, raise the temperature to 500-600°C and incinerate for 2~ 3h. The incinerator has an incineration container. There are many small holes distributed on the bottom plate of the container. There are heat exchange water pipes and gas exchangers distributed in the container. The incineration temperature in the rice husk is controlled by adjusting the distribution density of the heat exchange water pipes and the gas flow rate. The circulation of the rice husk ensures the full combustion of the rice husk, and at the same time, the hea...

Embodiment (2

[0022] Implementation example (2): preparation of nano-SiO 2 composite cement

[0023] Grind cement materials and slag into superfine mineral powder, and use the incineration heat derived from rice husk to dry at 60-80°C. nano-SiO 2 Dry and disperse evenly in ultra-fine cement mineral powder according to the mass percentage content in Table 1.

[0024] Table 1 Nano-SiO 2 Modified cement flexural strength, compressive strength

[0025]

[0026] As shown in the table above, doped with nano-SiO 2 It can significantly improve the early flexural strength and compressive strength of concrete, and improve the performance of cement. 3% Nano SiO 2 With the optimum dosage, the flexural strength of the modified cement increases by about 54.9% to 62.8%; its compressive strength increases by about 45.5% to 54.9%.

Images