High-expansion low-shrinkage bentonite and preparation method
A technology of low shrinkage and bentonite, applied in chemical instruments and methods, and other chemical processes, can solve problems that are not conducive to the self-healing performance of bentonite and affect the anti-seepage ability of bentonite, so as to ensure chemical stability, improve compactness, The effect of securing weather resistance and corrosion resistance
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Embodiment 1
[0034] A kind of bentonite with high expansion and low shrinkage rate, in the natural bentonite with a water content of 10-20%, mixed with nano-silicon oxide at a mass ratio of 100:3-10.
[0035] The preparation method comprises the following steps:
[0036] 1. Air-dry and sieve the natural bentonite soil sample; the particle size of the natural bentonite is less than 2mm;
[0037] 2. Add an appropriate amount of water to the natural bentonite and configure it to the target moisture content;
[0038] 3. The configured natural bentonite is sealed and maintained for more than 8 hours; in the preferred solution, the configured natural bentonite is placed in a plastic bag, sealed and maintained for 12 hours, so that the water is evenly distributed in the natural bentonite.
[0039] 4. Mix the natural bentonite and nano silicon oxide evenly according to the set mass ratio;
[0040] The bentonite with high expansion and low shrinkage rate is obtained through the above steps.
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Embodiment 2
[0049] Restricted expansion-shrinkage test: The test equipment includes saturator, vacuum pump, shrinkage meter, dial indicator, filter paper and permeable stone. First, the bentonite compacted sample in Example 1 was evacuated and saturated for about ten days. After the sample was completely soaked and saturated, the sample was taken out, and the soil sample was pushed out with a bulldozer, placed on a perforated plate, and the sample and perforated plate were called. The mass, weighing accuracy to 0.1g. Then install the dial indicator, the head of the dial indicator touches the surface of the sample, so that the gauge sub-meter maintains a certain degree of preload, and write down the initial reading. Conduct the shrinkage test at a room temperature not higher than 30°C. According to the sample temperature and shrinkage speed, record the reading of the dial indicator every 4 hours, and weigh the entire set of devices and the mass of the sample, accurate to 0.1g. After sever...
Embodiment 3
[0052] Free expansion-contraction test: test instruments include dilatometer, shrinkage meter, dial indicator, filter paper and permeable stone. The dilatometer is mainly used for the free expansion of the sample. Fix the bentonite compaction ring knife sample in the dilatometer, and maintain a constant load on the sample. If there is no load on the upper part of the sample, the surface of the sample will be uneven after expansion, which is not conducive to the development of subsequent tests. That is, the load is enough to keep the surface of the sample after expansion flat. Then the bentonite compacted ring knife sample was soaked in water and saturated for about ten days, and the contraction test was carried out in the same process as the limited expansion and contraction test process.
[0053] From Figure 6 Among them, it can be concluded that under the condition of free expansion, the compacted bentonite will expand significantly after soaking in water. The expansion r...
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