Patent name: manufacturing method of lime crystal
Technical field:
The invention relates to the field of building materials.
At present, lime used in construction projects needs to consume a lot of raw materials, manpower and energy, from limestone mining to transportation and incineration of finished lime. Quarrying also destroys the natural landscape, burning wasteland and polluting the natural environment. Therefore, saving lime consumption is of great significance. In the construction industry, someone once used an additive called strong powder as lime slurry, which can replace part of lime paste to reduce the amount of lime. But it is not convenient to dilute with boiling water when using. Moreover, this additive has high cost and is not suitable for long-term storage. If the dosage is improper, it will also affect the quality of mortar. Therefore, it is difficult to achieve large-scale promotion and use today.
The purpose of this invention is to provide a building mortar additive lime crystal with simple manufacturing process and low cost, which can replace a large amount of lime paste and ensure the engineering quality without dilution with boiling water.
The purpose of this invention is to dilute triethanolamine with 5 times of clear water, then add micro foaming agent and calcium carbonate powder without stirring evenly, and then dry to obtain white powdery lime crystals. Lime crystal is a good plasticizer for air-entraining mortar and a strong surfactant. Good water solubility. When in use, lime crystals are mixed into mortar and stirred to form a large number of micro-foams. These microbubbles can change the activity of two-phase interface in mortar and improve the workability and water retention of mortar. That is, it plays a plasticizing role in mortar. A large number of micro-foams combine with calcium atoms on the surface of mortar particles, which makes the mortar form a network structure. In this way, the volume of mortar will not be reduced by reducing the amount of lime. Experiments show that it also improves the later compressive strength of mortar, and one kilogram of lime crystal can replace 300 kilograms of lime paste.
Using lime crystallization can greatly reduce the amount of lime, reduce the construction labor, reduce the construction cost, improve the strength of mortar, ensure the engineering quality, save energy and be beneficial to environmental protection. It has good economic and social benefits.
In the embodiment of the invention, firstly, 8% triethanolamine is diluted with 5 times of clear water. Then 8% micro foaming agent was mixed with triethanolamine. Then 84% calcium carbonate powder is added, evenly stirred, finally dried and subpackaged in plastic bags to obtain the finished lime crystal. When in use, it is not diluted with boiling water, but directly added into the mortar, and can be used after being stirred evenly. In the added mortar, the amount of lime is only 30% of the conventional amount. The amount of lime crystals added is three thousandths of the amount of lime. Therefore, a lot of lime can be saved. Practice has proved that 1 kg lime crystal can replace 300 kg lime paste.
The lime crystal sample of the present invention has been sent to An Metallurgical Architecture Research Institute (presided over by Professor Zhang Lingmao), Beijing Building Material Quality Supervision and Inspection Station, Guangxi Building Science Design Institute, Testing Station of the Sixth Engineering Company of the Ministry of Petroleum, Guangxi Beihai Construction Engineering Laboratory and other units for testing. Good compression resistance, aging resistance and other properties. For example, the test results of Xi 'an Institute of Metallurgy and Architecture (chaired by Professor Zhang Lingmao) are as follows: 1. Lime crystal is a plasticizer of air-entraining mortar with good performance, which can replace lime paste in mortar to prepare building mortar with performance meeting construction requirements. Mortar can reach M2.5, M5, M7.5 and M 10 after hardening.
2. During the test and observation for half a year, there is no phenomenon of mortar strength shrinkage and "aging" tendency. It is speculated that the strength of 1 to 5 years will still be enhanced.
3. In building engineering, replacing a large amount of lime paste (1∶300) with a small amount of lime crystals can improve the construction conditions, ensure the quality, save lime and reduce the cost, and save cement as long as the mixture ratio is properly selected.
claim of right
1. Lime crystal consists of triethanolamine, calcium carbonate, micro foaming agent and other raw materials. Characterized in that: a. Triethanolamine is diluted with 5 times of clear water, then mixed with micro foaming agent and calcium carbonate respectively, evenly stirred and dried to obtain the finished lime crystal. B "lime crystal" can produce a large number of micro-foams, change the vitality of mortar two-phase interface, improve the workability and water retention of mortar, and play a plasticizing role in mortar.
2. The lime crystal according to claim 1, characterized in that when in use, mortar can be directly added and stirred without being diluted by boiling water.
Full text abstract
Lime crystal is a white powdery plasticizer with good air-entraining mortar performance. It is widely used to make all kinds of building mortar and precast all kinds of cement bricks. Each kilogram of lime crystal can replace 300 kilograms of lime paste. Low cost, convenient use, can improve mortar strength, ensure engineering quality, improve construction conditions, reduce engineering cost, save energy and protect the environment. It has good economic and social benefits.
The file number is c04b40/00gk1kloc-0/02630sq931kloc-0/463.
Publication date1May 1995 17 Application date1993165438+1October 10 Priority date19931/.
Inventor Lai Applicant: Lai