减水剂在商品混凝土中的应用研究

发布时间：2018-09-05 17:28

【摘要】：混凝土材料是目前建筑行业用量最大的材料，如何做好混凝土的节能降耗，绿色环保，适应现今社会的发展，是当前混凝土行业研究的重要方向。减水剂作为一种改善新拌和硬化混凝土性能的材料，在混凝土中的使用，使混凝土迎来了新的革命。论文对两种减水剂在商品混凝土中的应用进行了研究。论文通过试验的方法，研究萘系减水剂和聚羧酸系减水剂分别在不同掺量、不同水泥减少率的情况对新拌混凝土工作性能和硬化混凝土强度的影响，确定合理掺量和合理水泥减少率；在固定掺量、固定水泥减少率的条件下，对不同强度等级混凝土的工作性能和硬化后混凝土强度的影响；通过试验结果对比分析两种减水剂在商品混凝土中应用的技术经济效益、环保效益。试验研究表明：在所选择的原材料、减水剂的品种不变的条件下，①综合萘系减水剂和聚羧酸系减水剂对混凝土工作性能、抗压强度以及经济性综合考虑，萘系减水剂合理掺量为胶凝材料的1.8%，聚羧酸系减水剂合理掺量为0.8%。②在保证混凝土综合性能不低于原配比综合性能的情况下，萘系减水剂掺量为胶凝材料质量的1.8%时，可以降低水泥用量15%；聚羧酸系减水剂掺量为胶凝材料质量的0.8%时，可以降低水泥用量18%。③两种减水剂在各自合理掺量和水泥减少率的情况下，对不同强度等级的混凝土的工作性能和强度都有提高。④综合两种减水剂对混凝土综合性能的影响，萘系减水剂适用于低强度等级（C30及以下）的混凝土，聚羧酸系减水剂适用于较高强度等级（大于C30）的混凝土。
[Abstract]:The concrete material is the most used material in the construction industry at present. How to do well the energy saving and consumption reduction of concrete, green environmental protection, adapt to the development of the society, is the important direction of the current concrete industry research. As a kind of material to improve the performance of new mixing and hardening concrete, water reducing agent has ushered in a new revolution because of its application in concrete. The application of two water reducing agents in commercial concrete is studied in this paper. In this paper, the effects of naphthalene and polycarboxylic acid superplasticizer on the working performance and strength of freshly mixed concrete are studied by means of experiments, in which the content of naphthalene and polycarboxylic acid superplasticizer are different and the cement reduction rate is different. Under the condition of fixed content and fixed cement reduction rate, the influence on the working performance of concrete of different strength grades and the strength of concrete after hardening are determined. The technical and environmental benefits of the application of two water reducers in commercial concrete are compared and analyzed through the test results. The experimental results show that under the condition that the raw materials and the varieties of water reducer are not changed, the Naphthalene series water reducer and polycarboxylic acid series water reducer are considered comprehensively for the performance, compressive strength and economy of concrete. The reasonable amount of naphthalene water reducer is 1.8 of the cementitious material, and the reasonable amount of polycarboxylic water reducer is 0.8.2. When the comprehensive performance of concrete is not lower than that of the original ratio, the quantity of naphthalene water reducer is 1.8% of the quality of the cementing material. When the amount of polycarboxylic acid superplasticizer is 0.8 of the quality of the cementing material, the dosage of the cement 18.3 can be reduced in the case of reasonable addition of the cement and the reduction rate of the cement. The working performance and strength of concrete with different strength grades are improved. 4. The influence of two water reducing agents on the comprehensive properties of concrete is improved. Naphthalene water reducer is suitable for concrete with low strength grade (C30 and below). Polycarboxylic acid superplasticizer is suitable for concrete with high strength grade (greater than C 30).
【学位授予单位】：南昌大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU528.042.2

【参考文献】