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  • Concrete Knowledge 100 Questions (8)

    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

    2023-06-06
  • Concrete Knowledge 100 Questions (7)

    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

    2023-06-05
  • Concrete Knowledge 100 Questions (6)

    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

    2023-06-02
  • Concrete Knowledge 100 Questions (5)

    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

    2023-06-01
  • Concrete Knowledge 100 Questions (4)

    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

    2023-05-31
  • Concrete Knowledge 100 Questions (3)

    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

    2023-05-30
  • Concrete Knowledge 100 Questions (2)

    7. What is cement? How many kinds of cement are commonly used?A: where by Portland cement clinker, a reasonable proportion of mixed materials, a moderate amount of gypsum grinding fine made of hydraulic cementitious material called cement. Commonly used cement are: Portland cement, ordinary Portland

    2023-05-29
  • Concrete Knowledge 100 Questions (1)

    1. What is commercial concrete?Answer: According to the requirements of the demander, concrete mix with cement, water, sand, stone, admixture and mineral admixture and other components according to a certain proportion, after metering and mixing in the mixing station, sold and transported to the dem

    2023-05-26
  • What is the function of concrete admixture in engineering

    What important role can concrete admixtures play in engineering? Concrete admixtures can not only meet the production requirements of segments, but also outperform aliphatic water reducing agents in the production process, strength and durability indexes of segments. The popularization and applicati

    2023-05-25
  • Properties of polycarboxylic acid superplasticizer

    Polycarboxylic acid superplasticizer is a third generation of high-performance superplasticizer in modern engineering construction, which can improve the quality of construction projects and is a relatively satisfactory building material in engineering construction.It has a high water reduction, can

    2023-05-24
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