混凝土液体外加剂的微量计量系统研究

发布时间：2018-06-15 03:19

本文选题：混凝土 + 外加剂　；参考：《山东大学》2017年硕士论文

【摘要】：混凝土外加剂是改善和调节混凝土性能的重要物质,合理的运用混凝土外加剂,可以改善混凝土的和易性,提高混凝土强度和耐久性。随着外加剂技术的不断进步,外加剂的性能大幅提高,在混凝土中所占的比例也越来越少,传统的外加剂计量方式已无法满足许多高端工程的施工要求。因此,设计一套可以进行微量计量的新型外加剂计量系统已成为混凝土搅拌设备设计的一个重要课题。论文研究了传统外加剂计量系统的工作原理和工作特点,通过分析实际生产数据,总结出传统外加剂计量系统的误差来源,认为传统外加剂计量系统的计量方式易受外力、落差等因素的影响,不易实现微量外加剂的计量。为避免这些不利因素,论文改变了外加剂计量方式,将流量计量作为研究方向,设计出一套新型外加剂计量系统,达到了实现微量计量的目的。论文对本设计的设计原则和技术指标进行了分析,依据涡轮流量计的工作特性得出实现本设计的必要条件——使外加剂的流速保持恒定,在此基础上,设计出新型外加剂计量系统的总体方案,并对各个部分进行设计。其中,对核心部分——外加剂计量装置进行了详细的计算选型。论文最后,依照国家标准GB/T27738-2011《重力式自动装料衡器》的要求,制定了一套针对该系统的试验方法,对该系统的性能进行了验证。通过试验得出,该系统的综合性能优于传统外加剂计量系统,不但可以进行正常重量的外加剂添加,而且当添加量降低到1kg时,仍然可以将误差控制在±1%以内,因此,该设计可以满足搅拌站的实际生产要求。本设计通过改变外加剂的计量方式实现了外加剂的微量计量,解决了混凝土搅拌站的一大难题,同时,也对其它物料的计量方法提供了新的研究方向。
[Abstract]:Concrete admixture is an important material to improve and regulate the performance of concrete. The reasonable use of concrete admixture can improve the easiness of concrete and improve the strength and durability of concrete. With the development of admixture technology, the performance of admixture is greatly improved, and the proportion of admixture in concrete is less and less. The traditional metering method of admixture can not meet the construction requirements of many high-end projects. Therefore, the design of a new admixture metering system which can be used for micro measurement has become an important subject in the design of concrete mixing equipment. This paper studies the working principle and working characteristics of the traditional admixture metering system, summarizes the error source of the traditional admixture metering system by analyzing the actual production data, and thinks that the metering mode of the traditional admixture metering system is easy to be subjected to external force. The effect of drop and other factors is not easy to realize the measurement of trace admixture. In order to avoid these unfavorable factors, the paper changed the metering mode of admixture, took flux metering as the research direction, and designed a set of new admixture metering system to achieve the purpose of micrometering. The design principle and technical index of this design are analyzed in this paper. According to the working characteristics of turbine Flowmeter, the necessary condition of this design is obtained, which is to keep the velocity of admixture constant, and on this basis, The overall scheme of the new admixture metering system is designed, and each part is designed. Among them, the core part-admixture metering device is calculated and selected in detail. Finally, according to the national standard GB / T 27738-2011 "Gravity automatic charging weighing device", a set of test methods for the system is developed, and the performance of the system is verified. The experimental results show that the comprehensive performance of the system is better than that of the traditional admixture metering system. Not only can the admixture be added with normal weight, but also the error can be controlled within 卤1% when the additive content is reduced to 1kg. The design can meet the actual production requirements of the mixing plant. By changing the metering method of admixture, this design realizes the micro measurement of admixture, solves a big problem of concrete mixing station, and also provides a new research direction for metering methods of other materials.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528.042

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