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Standardization of Method for Determination of Material Composition Ratio of Fresh Concrete

新拌混凝土材料组成比测定方法标准化

基本信息

批准号：
01550451
负责人：
SIMIZU Akiyuki
金额：
$ 1.47万
依托单位：
Science Univ. of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01550451/
关键词：
Fresh concrete Concentration difference of chloride sodium Refractometer Unit water Unit cement Ratio of composition Mixing ratio control Quality control 機成材料比

项目摘要

(1) It is possible for the test method established in this studies to estimate rapidly, simply and accurately the quantity ratio of composition of fresh concrete (water, cement, aggregates and air) through joint use of a concentration refractometer of chloride sodium and a gravimeter. As the amount of absorption water on cement must be excluded from the effective water to estimate the unit water of fresh concrete, it was determined quantitatively. The sample solution to measure the specific gravity of cement suspension was prepared to mix 4l of water with 2l of the fresh concrete sample contained 200g of chlolide sodium solution with 25% of concentration for measure of unit water. The volume of air in fresh concrete was measured with the test by pressure method from another sample.(2) As result of extensive investigation of the quality control system in ready-mixed concrete plants, it was known that the difference of mixing ratio of fresh concrete for expectation was hardly checked after the mixture.(3) This method is useful for an advancement and stability of quality of concrete at a ready-mixed concrete plant or at a job site of construction, but in all cases it is must be considered the sampling of batch concrete for the test.(4) This method applies to high strength concrete with particular properties. As a little difference for expected mixing ratio influences the properties, it is suitable for the quality control of such a concrete.

(1)本研究建立的试验方法通过氯化钠浓度折光仪和重力仪的联合使用，可以快速、简单、准确地估算新拌混凝土成分(水、水泥、骨料和空气)的数量比。由于要估算新拌混凝土的单位水量，必须将水泥的吸水量排除在有效水量之外，因此采用定量确定的方法。测量水泥悬浮液比重的样品溶液的制备是，将4L水与2L新拌混凝土样品混合，其中含有200g浓度为25%的氯化钠溶液，用于测量单位水。新拌混凝土中的空气量是通过另一个样品的压力法测试来测量的。(2)通过对预拌混凝土厂质量控制系统的广泛调查，发现在混合后很难检查新拌混凝土的配合比与预期的差异。(3)该方法对于预拌混凝土厂或施工现场混凝土质量的提高和稳定是有用的，但总体而言特殊情况下必须考虑批量混凝土取样进行试验。 (4)本方法适用于具有特殊性能的高强混凝土。由于预期配合比的微小差异都会影响其性能，因此适合于此类混凝土的质量控制。