Sulphoaluminate maritime work cement and preparation method thereof

Abstract

The invention discloses sulphoaluminate maritime work cement and a preparation method thereof. The sulphoaluminate maritime work cement comprises the following main raw materials in parts by weight: 50-80 parts of cement clinker, 8.0-20 parts of anhydrite, 0-30 parts of limestone, 0-30 parts of slag, 0.1-0.5 part of water reducing agent, 0.001-0.005 part of air entraining agent, 0.1-0.5 part of retarder and 2-5 parts of silicon powder. The preparation method comprises the following steps of: respectively smashing, grinding and homogenizing the sulphoaluminate cement clinker, the anhydrite, the limestone and the slag; then, burdening at a ratio, and evenly mixing; adding the water reducing agent, the air entraining agent, the retarder and the silicon powder; and mixing and homogenizing to obtain the product. The concrete mixed by the sulphoaluminate maritime work cement has the advantages of small bleeding rate and high slurry viscidity. The slurry has strong covering and supporting action on aggregate. The concrete keeps good homogeneity and has the advantages of hard and quick early strength, continuously-increased later strength, good slurry structure compactness and high volume stability and is convenient to use and operate for constructing.

Description

technical field [0001] The invention belongs to the technical field of cement, and relates to a marine cement, in particular to a sulphoaluminate marine cement and a preparation method thereof. Background technique [0002] In recent years, countries all over the world have attached great importance to the development of marine resources. The construction of offshore projects such as ports, seawalls, coastal protection, cross-sea bridges, and offshore gas stations in China has developed rapidly. As we all know, marine engineering concrete structures have long been chemically corroded by salts in seawater, especially Cl - Corrosion, and also by sea waves, etc., the environment is very harsh, so the durability of marine concrete has been paid more and more attention. [0003] At present, ordinary cement and a small amount of sulfate-resistant cement are mainly used in ports, wharves, and marine engineering in my country. This type of cement has poor impermeability and wear r...

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Problems solved by technology

[0014] Utilizing the low alkalinity, acid and alkali resistance, early strength and quick hardening, and micro-expansion properties of sulphoaluminate cement, the compactness, impermeability, and anti-permeability of concrete are improved by compounding active mineral admixtures, surfactants, and other materials. Freezing, so that it has high resistance to chloride ion diffusion, volume stability and high resistance to sulfate erosion, which meets the needs of marine engineering construction and solves the problem of k in seawater in marine engineering. + 、cl - Such destructive problems as building damage and short service life after salt erosion and seawater erosion can overcome the slow early hydration rate and low strength of Portland cement. After hydration, Ca(OH) 2 High content causes deficiencies in impermeability and corrosion resistance

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