A kind of ultra-elevation pumping marine concrete and preparation method thereof

Abstract

The invention discloses a super-elevation pumping marine concrete. The super-elevation pumping marine concrete is prepared from cement, fly ash, mineral powder, gravel, river sand, a hydration temperature rising regulation and control material, a corrosive ion transport inhibitor, a state modified material, an ultra dispersed water reducing shrinkage plasticity-maintaining additive and water in proportion. According to the super-elevation pumping marine concrete, by means of the hydration temperature rising regulation and control material, cracking caused by low high performance concrete, insufficient hydration and drying shrinkage in later period can be effectively avoided; by means of the hydration temperature rising inhibiting component, adiabatic temperature rising of the concrete can be lowered, and cracking generated by the temperature stress is reduced; by adopting the corrosive ion transport inhibitor, the pore structure of the concrete can be optimized, transport paths of ions such as Mg<2+> and Cl<->, and the concrete is better served in marine salt spray environment; the state modified material has the specific ball effect and water retention characteristic, and the phenomena of segregation and pipe blocking occurring in the super-elevation pumping process are avoided. The concrete is suitable for super-elevation pumping marine buildings and has the important engineering application value.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a super-elevation pumping marine concrete and a preparation method thereof. Background technique [0002] In recent years, with the growing national economy and international influence of our country, in order to strengthen the connection and cooperation between regions, many large-scale infrastructure constructions such as cross-sea and cross-river are being carried out day by day, and the application of marine concrete is also increasingly popular in countries all over the world. s concern. In order to pursue higher and stronger concepts, the design of many sea-crossing bridges also follows the principles of elevation, high durability, and high carrying capacity. However, marine concrete serves in the harsh environment of the ocean, and has been subjected to seawater scouring, wave splashing and long-term exposure to Cl. - , Mg 2+ , SO 4 2- plasma erosion. Un...

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Problems solved by technology

Therefore, the amount of cement and cementitious materials in the concrete mix ratio is high, and the water-binder ratio is low. The resulting concrete shrinks greatly, the adiabatic temperature rises, and the temperature stress easily causes the concrete to crack; (2) The continuity of large-volume concrete pouring 1. The amount of pouring is large, so the amount of cementitious materials in the concrete mix ratio is low, the sand rate should be low, and the work performance is poor. During the construction process of high-level pumping, segregation and pipe plugging are easy to occur; (3) Super-elevation, long-span bridges Serving in the marine environment, due to the long-term coupling effect of dryness, humidity and salt spray, the diffusion rate of erosive ions in seawater is accelerated, which accelerates the corrosion of steel bars and the degradation of concrete bonding ability

Because of the problems faced by super-elevation pumping concrete, the long-term durability of marine concrete has been greatly affected, and its service life has been reduced.

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