阅读说明：本技术 预应力混凝土梁板连续端凿毛专用超缓凝剂及其制备工艺 (Special super retarder for roughening continuous end of prestressed concrete beam slab and preparation process thereof ) 是由 刘松柏 刘书华 许思鸿 吴建军 陆加毕 蔡弘 张健雄 于 2020-07-16 设计创作，主要内容包括：本发明涉及建筑材料技术领域,具体涉及预应力混凝土梁板连续端凿毛专用超缓凝剂及其制备工艺；包括如下原料：磷酸盐、羟基表面活性剂、引气剂、稳定剂、水；具体制备工艺为：1)每种原材料进厂依据相关国家、行业标准检测合格；2)在搅拌釜内加入总用水量的70%的常温饮用水；3)开动搅拌后依次加入磷酸盐、羟基表面活性剂、引气剂、稳定剂和剩下的常温饮用水混合,充分溶解搅拌均匀,取样检测合格后即得超缓凝剂；制备的缓凝剂无毒,无污染,并且对钢筋无锈危害。(The invention relates to the technical field of building materials, in particular to a special super retarder for roughening a continuous end of a prestressed concrete beam slab and a preparation process thereof; comprises the following raw materials: phosphate, hydroxyl surfactant, air entraining agent, stabilizer and water; the specific preparation process comprises the following steps: 1) each raw material is detected to be qualified according to relevant national and industrial standards; 2) adding normal-temperature drinking water accounting for 70% of the total water consumption into the stirring kettle; 3) starting stirring, sequentially adding phosphate, a hydroxyl surfactant, an air entraining agent, a stabilizer and the rest of normal-temperature drinking water, mixing, fully dissolving and uniformly stirring, and sampling and detecting to obtain the ultra-retarder; the prepared retarder is non-toxic and pollution-free, and has no rust harm to the steel bars.)

1. The special super retarder for chiseling the continuous end of the prestressed concrete beam slab is characterized in that: comprises the following raw materials: phosphate, hydroxyl surfactant, air entraining agent, stabilizer, auxiliary material and water.

2. The special super retarder for roughening the continuous end of the prestressed concrete beam slab according to claim 1, wherein the special super retarder is characterized in that: the air entraining agent is alkyl air entraining agent.

3. The special super retarder for roughening the continuous end of the prestressed concrete beam slab according to claim 1, wherein the special super retarder is characterized in that: the composite material comprises the following raw materials in percentage by mass: 10-30% of phosphate, 10-20% of hydroxyl surfactant, 1-3% of air entraining agent, 2-5% of stabilizer, and 60-70% of auxiliary material and water.

4. The preparation process of the special super retarder for roughening the continuous end of the prestressed concrete beam slab as claimed in any one of claims 1 to 3, wherein: the specific preparation process comprises the following steps:

1) each raw material is detected to be qualified according to relevant national and industrial standards;

2) adding normal-temperature drinking water accounting for 70% of the total water consumption into the stirring kettle;

3) and (3) starting stirring, sequentially adding phosphate, the hydroxyl surfactant, the air entraining agent, the stabilizer and the rest of normal-temperature drinking water, mixing, fully dissolving and uniformly stirring, and sampling and detecting to be qualified to obtain the super retarder.

5. The preparation process of the special super retarder for roughening the continuous end of the prestressed concrete beam slab as claimed in claim 4, wherein the special super retarder is characterized in that: and 2) the stirring speed in the stirring kettle in the step 2) is more than or equal to 36 revolutions per minute.

6. The preparation process of the special super retarder for roughening the continuous end of the prestressed concrete beam slab as claimed in claim 4, wherein the special super retarder is characterized in that: in the step 3), each raw material is added into the reaction kettle, and the stirring time is not less than 15 min.

7. The preparation process of the special super retarder for roughening the continuous end of the prestressed concrete beam slab as claimed in claim 4, wherein the special super retarder is characterized in that: in the step 3), the qualified detection standard is that the product is uniform and transparent, and the pH value is within 6-8.

8. The preparation process of the special super retarder for roughening the continuous end of the prestressed concrete beam slab as claimed in claim 4, wherein the special super retarder is characterized in that: adding antiseptic and water repellent into water.

9. The preparation process of the special super retarder for roughening the continuous end of the prestressed concrete beam slab as claimed in claim 4, wherein the special super retarder is characterized in that: in step 2), if the temperature of the normal temperature drinking water is lower than 5 ℃, the normal temperature drinking water needs to be heated to be not lower than 20 ℃.

10. The use method of the special super retarder for roughening the continuous end of the prestressed concrete beam slab as claimed in claim 4, wherein the special super retarder is characterized in that: the using method comprises the following steps: the dosage is 0.1 to 0.3Kg/m²The delayed coagulation time is 4-12 h, and the initial and final intervals are 1-3 h.

Technical Field

The invention relates to the technical field of building materials, in particular to a special super retarder for roughening a continuous end of a prestressed concrete beam slab and a preparation process thereof.

Background

The retarder is an additive capable of delaying and prolonging the setting time of concrete, the main action mode of the retarder is that the hydration progress of cement and admixture is delayed, the concrete has certain construction plasticity in a longer time, the retarder varieties for the concrete are more in the market at present, the use effects of different retarders are different, the use and doping amount and the action mechanism are also different, and the main concrete retarder has: inorganic salts, hydroxycarboxylic acids, polyhydroxy carbohydrates, lignosulphonates, and the like.

Disclosure of Invention

The invention aims to provide the special super retarder for roughening the continuous end of the prestressed concrete beam plate and the preparation process thereof.

In order to solve the technical problems, the invention adopts the following technical scheme:

the special super retarder for roughening the continuous end of the prestressed concrete beam slab comprises the following raw materials: phosphate, hydroxyl surfactant, air entraining agent, stabilizer and water.

Further, the air entraining agent is an alkyl air entraining agent.

Further, the feed comprises the following raw materials in percentage by mass: 10-30% of phosphate, 10-20% of hydroxyl surfactant, 1-3% of air entraining agent, 2-5% of stabilizer and 60-70% of water.

The preparation process of the special super retarder for roughening the continuous end of the prestressed concrete beam slab comprises the following specific preparation processes:

1) each raw material is detected to be qualified according to relevant national and industrial standards;

2) adding normal-temperature drinking water accounting for 70% of the total water consumption into the stirring kettle;

3) and (3) starting stirring, sequentially adding phosphate, a hydroxyl surfactant, an air entraining agent, a stabilizer and the rest of normal-temperature drinking water, mixing, fully dissolving and uniformly stirring, and sampling and detecting to obtain the special super retarder after the sample is qualified.

Further, the stirring speed in the stirring kettle in the step 2) is not less than 36 revolutions per minute.

Further, in the step 3), the stirring time is not less than 15min when each raw material is added into the reaction kettle.

Further, in the step 3), the qualified detection standard is that the product is uniform and transparent and the pH value is within 6-8.

Further, a preservative and a water repellent are added to the water.

Further, in step 2), if the temperature of the normal temperature drinking water is lower than 5 ℃, it is required to heat it to not lower than 20 ℃.

The use method of the special super retarder for roughening the continuous end of the prestressed concrete beam slab comprises the following steps: the dosage is 0.1 to 0.3Kg/m²The delayed coagulation time is 4-12 h, and the initial and final intervals are 1-3 h.

Compared with the prior art, the invention has the beneficial effects that: the super retarder prepared by the invention has simple preparation process and easy operation, and the produced super retarder is non-toxic and pollution-free and has no rust harm to steel bars; the super retarder prepared by the method can be stored for 3 months at normal temperature, and the storage time is long; the pH value of the product is 6-8, and the product is a neutral substance and has no pollution to the environment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.