67. Can observation of mixing current predict the degree of dryness of concrete mix?A: Predictable. Because the drier the mixture, the greater the stirring current; The thinner the mixture, the smaller the stirring current. The controller must pay attention to observe and record the stirring current

61, why are there three lines in each production mix, and how should they be used?A: A theoretical mix ratio of behavior (that is, the water content of sand and stone is zero) is used by some stations. The production mix used by the two acts of dry days. The mix ratio used on rainy days and after ra

55. How to prevent loss?A: The production controller should pay attention to the change of water consumption in the production process, when the water consumption is 10kg or more less than the set water consumption of the production mix used, that is, the less water should be added to the sand. The

49, How to treat customers?A: First of all, we should treat customers with polite words and deeds, first say hello and then ask questions, the tone is kind and not rude, and the language is civilized and does not panic; Able to do immediately to do, not lazy people do not delay; Reasonable requireme

43. What is the impermeability of concrete?A: It refers to the concrete's resistance to pressure water infiltration. Both basement and reservoir are required to have good impermeability.44, impervious concrete commonly used impervious grade has a few?A: There are four commonly used impermeability gr

37, how to check the quality of concrete mold test?A: Use vernier caliper to measure the length, width and height of the test die, allowing error ≤0.5mm. With caliper back and 0.02 ~ 1mm stainless steel gauge with measuring four inner surface flatness, allow error ≤0.05㎜ (standard method is card 100

31, concrete mix main test which several performance?A: It mainly tests the workability, slump and gas content of the mixture. Workability is represented by cohesiveness, water retention, fluidity and comprehensive expression.(1) cohesiveness - by eye observation, when the slump is done, the test bo

25. Which kinds of concrete mixing water should be used?Fresh water, tap water, groundwater, drinking water, recycled water, mixing station car washing water (part of mixing). Industrial waste water, domestic waste water and seawater shall not be used.26. What is the meaning of the word concrete? Ho

19. What items should be inspected when fly ash enters the factory?A: The fineness and water requirement ratio of fly ash should be tested. The key item is water requirement ratio. If the fineness slightly exceeds the standard and the water requirement reaches the level II requirement, the ash can b

13. Why should continuous grain grade stones be preferred for pumping concrete?Answer: Because the void fraction of single grain size is larger than that of continuous grain size when the stone is quite large and the particle size is the same, the large void fraction should be filled with mortar. Th