Kubica Jan, Galman Iwona
Department of Structural Engineering, Silesian University of Technology, 44-100 Gliwice, Poland.
Materials (Basel). 2022 Jan 4;15(1):347. doi: 10.3390/ma15010347.
The article presents laboratory tests on the impact of the mixing water content used in the preparation of fresh mortar on the flexural and compressive strength of one of the dry-mix mortars produced by a leading European producer and dedicated to bricklaying with clinker elements. The development of these parameters in relation to curing time was also analyzed. The mortar samples were prepared from a factory-made mortar mix using 4.0 L (the value recommended by the mortar manufacturer), 4.5 L, and 5 L of water per 25 kg bag of ready-made, pre-mixed dry mortar mix. All samples were tested in five series after 5, 9, 14, 21, and 28 days of sample curing. The results of these tests showed that the use of 6 and 18% more mixing water than recommended by the manufacturer (4.5 and 5 L per bag) adversely affected the basic mechanical parameters of the tested mortar. Moreover, it was found that the highest compressive strength values were obtained after 21 days of curing and not after 28 days as usual. It was also found that hardening time and higher than recommended water content adversely affected the bending strength of the mortar.
本文介绍了实验室测试，该测试针对欧洲一家领先生产商生产的、用于熟料砖砌筑的干混砂浆之一，研究了制备新鲜砂浆时所用拌合水含量对其抗折强度和抗压强度的影响。还分析了这些参数随养护时间的变化情况。砂浆样品由工厂预制的砂浆混合物制备而成，每25千克袋装现成预拌干砂浆混合物分别使用4.0升（砂浆制造商推荐的值）、4.5升和5升水。所有样品在养护5天、9天、14天、21天和28天后分五个系列进行测试。这些测试结果表明，使用比制造商推荐量多6%和18%的拌合水（每袋4.5升和5升）会对测试砂浆的基本力学参数产生不利影响。此外，还发现养护21天后获得的抗压强度值最高，而不像通常那样在28天后。还发现硬化时间和高于推荐的水含量会对砂浆的抗弯强度产生不利影响。
