水泥浆液在低温环境下的凝结特性试验研究
Experimental Study on Coagulation Characteristics of Cement Slurry Under Low Temperature Environment
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摘要: 针对冻土区、井筒解冻区注浆遇到水泥浆液凝结时间长、加固、堵漏效果差等问题，为了研究低温或负温环境下掺加外加剂的水泥浆液凝结特性，根据工程实际应用要求，配制了添加工业盐、甲酸钙、氯化钙的17种水泥浆液，分别研究其在3、0、-2 ℃环境温度下的初凝及终凝时间，分析不同低温环境下、不同添加剂对普通硅酸盐水泥浆液凝结时间的影响。研究结果表明：添加工业盐、甲酸钙或氯化钙的水泥浆液可有效缩短初凝和终凝时间，水泥浆液初凝、终凝时间均随着温度的降低而延长；3 ℃环境温度时，水泥浆液初、终凝时间随工业盐含量增加而缩短，甲酸钙、氯化钙含量为4%时水泥浆液初凝时间最短，氯化钙含量为2%时水泥浆液终凝时间最短；0 ℃环境温度时，工业盐含量5%时、甲酸钙或氯化钙含量2%时的水泥浆液的初凝时间、终凝时间最短；-2 ℃条件下，工业盐含量5%时、甲酸钙或氯化钙含量3%时的水泥浆液的初凝时间、终凝时间最短，凝结效果良好。Abstract: The grouting in the frozen soil area and the thawing area of the shaft encountered many problems, such as long setting time of cement slurry, poor effect of reinforcement and plugging. In order to study the coagulation characteristics of cement slurry with admixtures under low temperature or negative temperature conditions, 17 kinds of cement slurry added with industrial salt, calcium formate and calcium chloride were compounded on the basis of the requirements of engineering application. The initial setting time and the final setting time at 3 ℃, 0 ℃ and -2 ℃ were studied. The influence of different temperature and different additives on the setting time of Portland cement slurry was analyzed. The results show that: the initial and final setting time of cement slurry can be effectively shortened by adding industrial salt, calcium formate or calcium chloride, the initial and final setting time of cement slurry extend with the decrease of temperature. The initial and final setting time of cement slurry is shortened with the increase of industrial salt content at 3 ℃ environmental temperature, when the content of calcium formate and calcium chloride is 4%, the initial setting time of cement slurry is the shortest, and the final setting time of cement slurry is the shortest when the content of calcium chloride is 2%. The initial and final setting time of the cement slurry is the shortest when the content of industrial salt is 5%, and the content of calcium formate or calcium chloride is 2% at 0 ℃ ambient temperature. The initial and final setting time of the cement slurry is the shortest when the content of industrial salt is 5%, and the content of calcium formate or calcium chloride is 3% at -2 ℃ ambient temperature.
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Keywords:
- industrial salt /
- calcium formate /
- calcium chloride /
- low temperature environment /
- cement slurry /
- setting time
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