阅读说明：本技术 一种碱骨料试验用的标准高碱水泥的制备方法 (Preparation method of standard high-alkali cement for alkali aggregate test ) 是由 尧炼 杨俊滨 伍剑锋 晏才圣 于 2019-12-04 设计创作，主要内容包括：本发明的公开了一种碱骨料试验用的标准高碱水泥的制备方法,该制备方法制备的水泥能有效提高水泥含碱量,并且不影响水泥的其它性能,其制备方法简单,原料易得；其技术方案是包括下述步骤：将标准的硅酸盐水泥PI或硅酸盐水泥在75-85℃烘干20-28h；将步骤1)烘干后的硅酸盐水泥PI和硅酸盐水泥PII放置于研磨机中,加入水泥总质量1-1.5％的钠盐,0.1-0.2％镁盐和1-1.5％钾盐后研磨15-30min；3)向步骤2)中加入水泥质量0.5-1.0％抑制水泥膨胀剂,搅拌均匀；属于建筑材料技术领域。(The invention discloses a preparation method of standard high-alkali cement for alkali aggregate tests, the cement prepared by the preparation method can effectively improve the alkali content of the cement, does not influence other performances of the cement, and has simple preparation method and easily obtained raw materials; the technical scheme comprises the following steps: drying standard portland cement PI or portland cement at 75-85 deg.C for 20-28 h; putting the silicate cement PI and the silicate cement PII dried in the step 1) into a grinding machine, adding sodium salt accounting for 1-1.5% of the total mass of the cement, magnesium salt accounting for 0.1-0.2% of the total mass of the cement and potassium salt accounting for 1-1.5% of the total mass of the cement, and grinding for 15-30 min; 3) adding a cement expansion inhibitor accounting for 0.5-1.0% of the mass of the cement into the step 2), and uniformly stirring; belongs to the technical field of building materials.)

1. The preparation method of the standard high-alkali cement for the alkali aggregate test is characterized by sequentially comprising the following steps of:

1) drying standard portland cement PI or portland cement PII at 75-85 deg.C for 20-28 h;

2) putting the silicate cement PI and the silicate cement PII dried in the step 1) into a grinding machine, adding sodium salt accounting for 1-1.5% of the total mass of the cement, magnesium salt accounting for 0.1-0.2% of the total mass of the cement and potassium salt accounting for 1-1.5% of the total mass of the cement, and grinding for 15-30 min;

3) adding 0.5-1.0% of cement expansion inhibitor by mass into the step 2), and uniformly stirring.

2. The method for preparing a standard high alkali cement for alkali aggregate test according to claim 1, wherein the grinding mill is a planetary ball mill.

3. The method of claim 1, wherein the cement expansion inhibitor is MgO.

4. The method for preparing standard high alkali cement for alkali aggregate test according to claim 1, wherein the sodium salt is Na₂SO₄Or Na₂CO₃。

5. The method of claim 1, wherein the magnesium salt is MgSO₄Or MgCO₃。

6. The method for preparing a standard high alkali cement for alkali aggregate test as claimed in claim 1, wherein the potassium salt is K₂SO₄Or K₂CO₃。

Technical Field

The invention discloses a preparation method of high-alkali cement, in particular to a preparation method of standard high-alkali cement for an alkali aggregate test; belongs to the technical field of building materials.

Background

The concrete Alkali-aggregate reaction (AAR) means that specific internal components in the aggregate further react with Alkali substances in cement, additives, admixtures and the like in concrete under certain conditions to lead the concrete Alkali-aggregate reactionThe phenomena of expansion, cracking and even damage of the concrete structure are caused, the concrete structure is seriously collapsed, and the phenomena are one of important factors influencing the durability of the concrete. The Chinese hong Kong industry standard CS1:2010 adopts European and American test methods as reference for concrete alkali-aggregate reaction, takes a mortar rod as a sample, and adopts the principle of accelerating alkali reaction to test and evaluate the performance of the alkali reaction of the aggregate. Wherein, the main material cement for preparing the mortar rod is high-alkali cement, the technical requirement is Portland cement CEM1 or ASTM Type 1, the acid alkali content is more than or equal to 1.0 percent, and the fineness is more than or equal to 450m²Per kg (EN196-6), a stability (EN196-3 Raynaud's clamp method) of 0mm or an autoclaved expansion rate of less than or equal to 0.2% (ASTM C151). However, our country has not produced this particular standard test cement.

Because the acid-base content of silicate water in China is not more than 0.6 percent. Therefore, it is a technical problem how to increase the alkali content of cement without obviously affecting other properties of cement.

Disclosure of Invention

In view of the above problems, the present invention aims to provide a method for preparing standard high alkali cement for alkali aggregate test, which can effectively provide alkali content of cement, does not affect other properties of cement, and has the advantages of simple preparation method and easily available raw materials.

Therefore, the technical scheme provided by the invention is as follows:

a preparation method of standard high-alkali cement for alkali aggregate test sequentially comprises the following steps:

1) drying standard portland cement PI or portland cement PII at 75-85 deg.C for 20-28 h;

2) putting the silicate cement PI and the silicate cement PII dried in the step 1) into a grinding machine, adding sodium salt accounting for 1-1.5% of the total mass of the cement, magnesium salt accounting for 0.1-0.2% of the total mass of the cement and potassium salt accounting for 1-1.5% of the total mass of the cement, and grinding for 15-30 min;

3) adding 0.5-1.0% of cement expansion inhibitor by mass into the step 2), and uniformly stirring.

Further, in the preparation method of the standard high-alkali cement for the alkali aggregate test, the grinding machine adopts a planetary ball mill.

Further, in the preparation method of the standard high-alkali cement for the alkali aggregate test, the cement expansion inhibitor is MgO.

Further, in the preparation method of the standard high-alkali cement for the alkali aggregate test, the sodium salt is Na₂SO₄Or Na₂CO₃。

Further, in the preparation method of the standard high-alkali cement for the alkali aggregate test, the magnesium salt is MgSO₄Or MgCO₃。

Further, in the preparation method of the standard high-alkali cement for the alkali aggregate test, the potassium salt is K₂SO₄Or K₂CO₃。

Compared with the prior art, the invention has the beneficial effects that:

the technical scheme provided by the invention adopts the existing cement in China to prepare the special high-alkali cement for alkali aggregate reaction, which meets the European or American standard system; the raw materials are simple, the preparation process is simple and efficient, the produced cement has controllable quality and good consistency, the alkali content of the cement is effectively improved, and other properties of the cement are not influenced.

Detailed Description

The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.