Preparation method of modified coral aggregate and basic magnesium sulfate cement gradient composite coral aggregate concrete
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A magnesium sulfate and concrete technology, applied in the field of concrete, can solve problems such as increasing safety risks and affecting the durability of Portland cement-based materials
Active Publication Date: 2021-07-30
ANHUI UNIVERSITY OF ARCHITECTURE
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Chemical treatment usually uses low-concentration acid solutions (such as hydrochloric acid and sulfuric acid, etc.), but the use of these strong acids will not o
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[0036] The present invention provides a kind of preparation method of modified coral aggregate, comprising the following steps:
[0037] (1) Soak and corrode coral aggregates in weak acid aqueous solution to obtain acid-treated coral aggregates;
[0038] (2) Soak the acid-treated coral aggregate in basic magnesium sulfate cement slurry material to obtain modified coral aggregate.
[0039]Preferably, in the step (1): the weak acid is citric acid, and the mass fraction of the weak acid in the weak acid aqueous solution is 0.5-3%, more preferably 0.5%-2%, more preferably 1%. Excessive acid concentration will increase the porosity of coral aggregate, destroy the skeleton structure of coral aggregate, reduce the strength of aggregate, and then reduce the strength of coral concrete.
[0040] In an embodiment of the present invention, the weak acid aqueous solution used is an aqueous citric acid solution, and the present invention has no special requirements on the specific source o...
Embodiment 1
[0052] Step 1: Sieve the undisturbed coral aggregate with a particle size of 5.0-10mm, and dry the coral aggregate at 80°C for 24 hours;
[0053] Step 2: Soak the coral aggregate obtained in Step 1 in 1% citric acid solution for 40 minutes (the mass ratio of coral aggregate to citric acid solution is 1:1.5), filter and remove after soaking (without washing) And drying the coral aggregate at 80°C for 24 hours to obtain the acid-treated coral aggregate;
[0054] Step 3: Take 500 parts of light-burned magnesia powder (the light-burned magnesite powder with active magnesium oxide content of 60%), 333 parts of magnesium sulfate heptahydrate, 340 parts of water and 5 parts of citric acid are mixed and stirred in proportion to prepare alkali formula magnesium sulfate cement grouting material, and put 600 parts of step two gained acid-treated coral aggregates into the basic magnesium sulfate cement grouting liquid and soak for 10 minutes, then remove and filter to obtain modified cora...
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Abstract
The invention relates to the technical field of concrete, and particularly discloses a preparation method of modified coral aggregate and basic magnesium sulfate cement gradient composite coral aggregate concrete. The preparation method comprises the following steps: firstly, soaking original coral aggregate in a weak acid aqueous solution for micro-corrosion to obtain acid-treated coral aggregate, and then soaking the acid-treated coral aggregate in a basic magnesium sulfate cement-based slurry coating material prepared from active magnesium oxide, magnesium sulfate heptahydrate, citric acid and water to obtain modified coral aggregate; and preparing the basic magnesium sulfate cement-based coral aggregate concrete from the aggregate, active magnesium oxide, magnesium sulfate heptahydrate, citric acid and water as raw materials. Based on a core admixture and a gradient composite technology, the invention provides a method for enabling basic magnesium sulfate cement whiskers to grow in communicated pores of coral aggregate, and external pores of the coral aggregate are fully filled with gradient composite basic magnesium sulfate cement. The effects of reducing the overall porosity of the coral aggregate concrete, optimizing the concrete interface transition area and improving the working performance and the mechanical property of the concrete are achieved.
Description
technical field [0001] The invention relates to the technical field of concrete, and specifically discloses a preparation method of modified coral aggregate and basic magnesium sulfate cement gradient composite coral aggregate concrete. Background technique [0002] Coral is a special sedimentary rock, mainly composed of coral reef algae and marine biological bone debris, and more than 96% of it is calcium carbonate. Scholars have found that it is feasible to use coral coarse aggregate to make concrete. At present, coral aggregate has been widely used in marine concrete. [0003] Although coral aggregate alleviates the huge demand for aggregate in marine engineering, compared with ordinary concrete, the unit water consumption of coral concrete is large and the amount of cement required is 30%-40% more than ordinary concrete. At the same time, coral concrete also exhibits a characteristic of low strength and high brittleness. Although the use of mineral admixtures and admi...
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