The following is Zhou Zhi's graduation thesis "Prevention and Treatment of Concrete Cracks" for your reference:

Title: Prevention and Treatment of Concrete Cracks

I. Introduction

Concrete is a widely used building material in construction engineering, which has the advantages of high structural strength and good durability. However, concrete cracks are common problems in construction projects, which not only affect the aesthetics and structural safety of buildings, but also may cause serious engineering quality problems. Therefore, it has important practical significance to study the prevention and treatment of concrete cracks.

Second, the types and causes of concrete cracks

1. Dry shrinkage cracks: cracks caused by surface drying shrinkage due to different evaporation degrees of water inside and outside the concrete.

2. Temperature cracks: cracks caused by thermal expansion and cold contraction of concrete due to temperature changes.

3. Settlement cracks: cracks caused by uneven settlement of foundation, resulting in structural stress exceeding the bearing capacity of concrete.

4. Load crack: crack caused by external load, which leads to structural stress exceeding the bearing capacity of concrete.

Three, concrete crack prevention measures

1. control the quality of concrete raw materials: select high-quality cement, sand, stone and other raw materials, and control the mixture ratio and water-cement ratio.

2. Strengthen construction process control: ensure the quality of concrete pouring, vibrating and curing, and avoid cracks such as shrinkage, temperature and settlement.

3. Structural measures to increase steel bars: increase the number, diameter and spacing of steel bars to improve the crack resistance of concrete.

4. Admixtures: By using admixtures, the workability and durability of concrete are improved and cracks are reduced.

5. Strengthen temperature control: Take effective temperature control measures to prevent temperature cracks.

Four, the treatment method of concrete cracks

1. surface repair method: for tiny cracks on the surface, cement mortar, epoxy mortar and other materials can be used to repair them.

2. Grouting method: For deep or penetrating cracks, grouting method can be used for treatment. Commonly used grouting materials are epoxy resin, methacrylate, acrylamide and so on.

3. Paste method: For some large cracks, paste method can be used to deal with them. Commonly used paste materials are carbon fiber cloth, steel plate and so on.

4. Replacement method: For seriously damaged concrete structures, replacement method can be used for treatment. Damaged concrete will be removed and replaced with new concrete or other materials.

5. Filling method: For some cracks with large width and shallow depth, filling method can be used for treatment. Commonly used filling materials are asphalt, mortar, etc.

6. Pre-stress method: By applying pre-stress, the concrete structure will have a certain anti-arch effect to offset the tensile stress caused by some external loads and achieve the purpose of preventing cracks.

7. Increase supporting and fixing measures: By increasing supporting and fixing measures, the stress state of the structure is improved and the possibility of cracks is reduced.

8. Strengthen daily maintenance management: deal with and maintain existing cracks in time to prevent further development of cracks.

A Case Study of verb (abbreviation of verb)

This part will discuss the prevention and treatment methods of concrete cracks through actual case analysis. For example, a serious temperature crack occurred in the construction of a high-rise building, and this problem was successfully solved by taking reasonable preventive and treatment measures. Specific case analysis should be combined with engineering background, cause analysis and treatment methods in detail.

The conclusion and prospect of intransitive verbs

In this paper, the prevention and treatment of concrete cracks are deeply studied, and the corresponding conclusions and measures are obtained. The conclusion should include the main viewpoints and innovations of the paper, as well as suggestions and prospects for concrete crack prevention. Its prospect should be expounded from the aspects of practical application and development trend, so as to provide reference for follow-up research.