With the same proportion of concrete, the strength of cement is higher, the strength of stones is higher, the variety and gradation of stones are higher, and the slump is greater. The strength of pure stone is generally around 670, which is much higher than that of ordinary concrete.
Therefore, it is definitely useful to add more stones, but remember that stones must be better, and gravel with less soil, 1-3cm or so, is too small and too big. After all, the size of the trial mold is limited, and the shape should not be too strange, especially the needle shape.
Also, the concrete should not be too thin, which is also the key to affect the strength. Let's not talk about the production process of concrete, let's talk about making test blocks first. Try to choose a sticky one with long stirring time and good workability. Sampling is very important.
Extended data:
When (1) is used in reinforcement engineering construction, it is necessary to conduct secondary inspection on the used reinforcement, mainly to check whether the quality of reinforcement meets the specific needs of construction. After the inspection is completed, the rust on the steel surface should be removed in practical application to ensure the cleanliness of the steel surface. In the field construction, it is necessary to weld the reinforcement evenly.
(2) During box girder construction, the template setting should be considered first, so as to ensure that the bottom template adopts 15× 10cm (wood square), and the spacing between each wood square is about 1m during the layout. When pouring concrete for box girder, we should grasp the problem of elastic deformation. In order to reduce the occurrence of elastic deformation, we can adopt the method of pouring twice, and ensure the quality of concrete pouring by selecting the pouring position reasonably.
Baidu encyclopedia-Yuli concrete bridge