A seawater coral aggregate concrete
A technology of concrete and concrete water reducing agent, applied in the field of civil engineering and marine engineering materials, can solve the problems of poor workability, time-consuming and labor-intensive, and long-term strength shrinkage of freshly mixed materials, and achieve efficient pumping mechanized construction and overcome the setting time The effect of advancing and prolonging the pouring operation time
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Embodiment 1
[0063] In this embodiment, the seawater coral aggregate concrete is composed of the following raw materials by mass:
[0064] 320kg of low-heat marine portland cement, 135kg of salt-fixing agent for seawater coral aggregate concrete, 183kg of seawater, 530kg of pre-screened natural coral sandstone mixture (grain size is 0-20mm), pre-screened broken coral stone sand mixture ( The particle size is 0-31.5mm) 1020kg, seawater coral aggregate concrete superplasticizer 3.6kg, concrete retarder 280g, concrete defoamer 7g.
[0065] In addition, preferably, the 3d hydration heat of the low-heat marine Portland cement is not greater than 195kJ / kg, and the 7d hydration heat is not greater than 220kJ / kg.
[0066] Preferably, the seawater coral aggregate concrete salt-fixing agent is composed of microsilica fume, nanometer silica powder, metakaolin and mineral powder.
[0067] Preferably, in the pre-screened natural coral sandstone mixture (with a particle size of 0 to 20mm), 70% to 95% o...
Embodiment 2
[0075] In this embodiment, the seawater coral aggregate concrete is composed of the following raw materials by mass:
[0076] 350kg of low-heat marine portland cement, 150kg of salt-fixing agent for seawater coral aggregate concrete, 155kg of seawater, 460kg of pre-screened natural coral sandstone mixture (grain size is 0-20mm), pre-screened broken coral stone sand mixture ( The particle size is 0-31.5mm) 1060kg, seawater coral aggregate concrete water reducer 5.8kg, concrete retarder 400g, concrete defoamer 8g.
[0077] In this embodiment, the raw materials used in the seawater coral aggregate concrete are the same as those in Embodiment 1.
[0078] In this example, the 28d compressive strength of the seawater coral aggregate concrete is 52.1MPa, and the long-term strength is stable without shrinkage; its 28d self-shrinkage is zero, and the 28d total shrinkage is higher than that of ordinary sandstone aggregates of the same strength. Concrete should be reduced by about 200με...
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