论文部分内容阅读
混凝土中掺用木素磺酸钙作为附加剂(减水剂)具有节约水泥,增加混凝土抗压强度,改善混凝土和易性和抗渗性,推迟水化热热峰出现时间等优点。我段去年在上海铁道学院的帮助下,在几个工程中使用了这种附加剂。我段使用的水素磺酸钙系吉林省延吉县开山屯化学纤维浆厂生产,出厂价格420元/吨。掺用量不得超过水泥用量的0.25％。使用时先将木素磺酸钙加水搅拌均匀成溶液,当混凝土加水(减去溶液水量)搅拌后,再慢慢将该溶液掺入混凝土中,继续搅拌均匀。要防止由于搅拌不匀造成局部混凝土中的木素磺酸钙掺用量超过0.25％的现象。使用前需做一些小型的级配试验。现将使用情况简介如下。一、用于10米跨度的予制钢筋混凝土梁
The addition of calcium lignosulfonate as an additive (water reducing agent) to the concrete has the advantages of saving cement, increasing the compressive strength of the concrete, improving the workability and impermeability of the concrete, and postponing the appearance time of the heat and heat peak of the hydration. Last year, I used this additive in several projects with the help of the Shanghai Railway Institute. The calcium sulphonate used in our section is produced at the Kaishantun Chemical Fiber Pulp Plant in Yanji County, Jilin Province, and the ex-factory price is 420 yuan/ton. Dosage should not exceed 0.25% of the amount of cement. When used, the calcium lignosulfonate is first mixed with water and stirred to form a solution. When concrete is added with water (minus the amount of solution), the solution is slowly mixed into the concrete and the stirring is continued. It is necessary to prevent the phenomenon that the amount of calcium lignosulfonate added in the local concrete exceeds 0.25% due to uneven stirring. Some small grading tests are required before use. The usage profile is as follows. First, for the prefabricated reinforced concrete beam of 10 meters span