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混凝土氨基磺酸系高效减水剂的使用研究
来源:http://www.jnjrh.com 日期:2019-01-02 发布人:admin
氨基磺酸系(  ASP)  减水剂是完全不同于萘系( NS) 、三聚氰胺系( MS) 的新型减水剂,它与不同水泥品种有相对更好的相容性,具有更高的减水率和保持混凝土高流动性的功能。氨基磺酸系高效减水 剂产品碱含量极低,减水率高、保持混凝土流动性的 时间长,而且生产合成工艺也相对简单,污染小,是有利于环保的新型材料。氨基磺酸系高效减水剂作为一种新型减水剂,相关文献有不少研究报道,但其应用试验研究较少。
Aminosulfonic acid (ASP) water reducer is a new type of water reducer completely different from naphthalene (NS) and melamine (MS). It has better compatibility with different cement varieties, higher water reduction rate and high fluidity of concrete. Aminosulfonic acid series superplasticizer products have very low alkali content, high water reduction rate, long time to maintain the fluidity of concrete, and relatively simple production and synthesis process, less pollution, which is conducive to environmental protection of new materials. As a new type of water reducing agent, aminosulfonic acid series superplasticizer has been reported in many literatures, but its application and experimental research are few.
本文依照GB8076—1997《混凝土外加剂》标准,系统研究了氨基磺酸系高效减水剂的主要性能指标。
According to GB8076-1997 "Concrete Admixture" standard, the main performance indexes of aminosulfonic acid series superplasticizer were systematically studied.
1 试验准备
1 Test preparation
1. 1 原材料
1.1 Raw Materials
( 1) 水泥: 水泥品种选用 P. O52. 5。
(1) Cement: P.O52.5 is selected as the cement variety.
( 2) 砂: 根据GB / T14684—2001 建筑用砂规定,选择级配合格的粗砂,砂的含水率为1. 5% 。
(2) Sand: According to GB/T 14684-2001 construction sand regulations, the coarse sand with grade matching is selected, and the moisture content of sand is 1.5%.
( 3) 石: 根据GB / T14685—2001 建筑用卵石、碎石规定,选用质地坚硬、表面粗糙的粒径5 ~20 mm 碎石,粒径为5 ~10 mm 的占40% ,粒径为10 ~20cm 的占60% 。测得其含水率为0. 2% 。
(3) Stone: According to the regulations of GB/T 14685-2001 for building pebbles and gravel, the hard-textured and rough-surfaced gravel with 5-20 mm diameter is selected, 40% of which are 5-10 mm and 60% of which are 10-20 cm in diameter. The moisture content is 0.2%.
( 4) 水: 采用自来水。
(4) Water: tap water is used.
1. 2 高强混凝土基准配合比计算
1.2 Calculation of reference mix ratio of high strength concrete
( 1) 采用质量法计算配合比。基准混凝土初步配合比( 每立方米混凝土用量)  为: 水泥 529  kg,水190  kg,石 1 205  kg,砂 544  kg。砂含水率为 1. 5% ,石子含水率为0. 2% 。根据要求配合比调整为: 水泥 529  kg,水 179  kg,石 1 207  kg,砂 552  kg。
(1) The mix ratio was calculated by mass method. The initial mix ratio of base concrete (concrete dosage per cubic meter) is 529 kg of cement, 190 kg of water, 1 205 kg of stone and 544 kg of sand. The water content of sand and stone is 1.5% and 0.2% respectively. According to the requirements, the mix ratio is adjusted to 529 kg cement, 179 kg water, 1 207 kg stone and 552 kg sand.
( 2) 试配与调整。混凝土配合比先做坍落度检测,不符合要求时,再进行调整。由于混凝土较稠,坍落度过小,调整方法为:  保持水灰比不变,增加水和水泥,保持砂石比率不变,按比例减少粗、细骨料。最后调整结果( 每立方米混凝土用量) 为: 水泥839kg,水 285  kg,石 771  kg,砂 363  kg。
(2) Trial matching and adjustment. The concrete mix ratio is first tested for slump, and then adjusted when it does not meet the requirements. Because the concrete is thicker and slump is too small, the adjustment methods are as follows: keeping the water cement ratio unchanged, increasing water and cement, keeping the sand stone ratio unchanged, reducing coarse and fine aggregates proportionally. The final adjustment results (concrete dosage per cubic meter) are: cement 839 kg, water 285 kg, stone 771 kg, sand 363 kg.
氨基磺酸
1. 3 对比混凝土配合比设计
1.3 Proportion Design of Contrastive Concrete
对比混凝土配合比,在水泥、砂、石的用量方面与基准混凝土保持一致,掺入的氨基磺酸系高效减水剂的量为水泥用量的0. 4% ,用水量以使新拌混凝土坍落度在50 ~70 mm 为准,具体配合比( 每立方米混凝土用量) 为: 水泥 839  kg,氨基磺酸系高效减水剂 3. 356  kg,石 771  kg,砂 363  kg。
Compared with concrete mix ratio, the amount of cement, sand and stone is consistent with that of base concrete. The amount of amino sulfonic acid series superplasticizer is 0.4% of that of cement, and the amount of water is used to make the slump of fresh concrete between 50 and 70 mm. The concrete mix ratio (the amount of concrete per cubic meter) is 839 kg of cement, 3.356 kg of amino sulfonic acid series superplasticizer, 77 kg of stone. 1 kg, sand 363 kg.
2 减水剂性能检测
Performance Testing of 2 Water Reducing Agent
2. 1 减水率检测
2.1 Water Reduction Rate Detection
减水率定义为坍落度基本相同时( 50 ~70 mm) 对比混凝土和基准混凝土单位用水量之差与基准混凝土单位用水量之比。坍落度测定按照GBJ80—85进行,试验测得 W  = 277. 9 kg / m3 ,W  = 216. 6 kg / m3 ,由此计算得出减水率WR = 22% 。
Water reduction rate is defined as the ratio of the difference between the unit water consumption of the contrast concrete and the reference concrete and the unit water consumption of the reference concrete when the slump is basically the same (50-70 mm). Slump measurement was carried out according to GBJ80-85. W = 277.9 kg/m3, W = 216.6 kg/m3 were measured by experiment, and water reduction rate WR = 22% was calculated.
2. 2 混凝土抗压强度比测试
2.2 Testing of Compressive Strength Ratio of Concrete
抗压强度之比表示。对比混凝土与基准混凝土抗压强度试验按照GBJ81—85《普通混凝土基本力学性能试验方法》进行。试件采用标准振动台,振动时间为 15 ~ 30  s,试件静停温度为( 20 ± 3) ℃ 。每批 1组,以2 个试样的抗压强度平均值表示,如果其中1 个与平均值之差大于平均值的15% ,则取3 个值的中间值作为结果,如果最大值和最小值与平均值之差均大于平均值的15% ,则重新做。3 批结果的平均值为其强度值。
The ratio of compressive strength is expressed. Compressive strength test of contrast concrete and reference concrete is carried out according to GBJ81-85 "Test Method for Basic Mechanical Properties of Ordinary Concrete". Standard shaking table was used for the specimens. The vibration time was 15-30 seconds and the static stop temperature was (20+3)degrees Celsius. In each batch of 1 group, the average compressive strength of 2 samples is expressed. If the difference between one and the average is greater than 15% of the average value, the median of three values is taken as the result. If the difference between the maximum and minimum values and the average values is greater than 15% of the average value, the new one is done. The average value of the three batches was their strength value.
试验结果表明,由于氨基磺酸系高效减水剂具有明显的强度提高效果,对比混凝土 3,7  d 强度明显
The test results show that the aminosulfonic acid-based superplasticizer has obvious effect on improving the strength of concrete, and the strength of concrete is obviously higher than that of concrete in 3 and 7 days.
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