9 Different types of Structure of rocks – Civillearners
9 Different Types of Structure of rocks – Civillearners Definition: Texture and Structure of Rocks are defined as nature and characteristics of rocks from there respective minerals and rock stones. The texture is characterized by its shape and its minerals; the structure is characterized by its arrangement, features components of the rock. Following are the different types of Structures: 1) Compact crystalline: Fine grains or particles are held…
Rock forming minerals | Definition – civillearners
Rock-forming minerals | Definition – civillearners Definition: Igneous rocks contain many minerals. Various natural minerals having a wide range of different distinctive characterÂistics are available. But only a few of them form the bulk of rocks. These minerals are called the rock-forming minerals. Rock-Forming Minerals are classified into two categories: Rock minerals in igneous rocks…
Characteristics of building materials – civil learners
Characteristics of building materials – civil learner This post focuses on the classifications and the technical standards of building materials; it summarizes the characteristics of building materials and their status in construction engineering briefly, and also introduces the development of building materials. Definitions and Classifications of Building Materials: In the general environment for humans’ survival,…
Hydration of cement | Definition – Civil learners
HYDRATION OF CEMENT The chemical reaction between cement and water is called hydration or cement hydration. When water is added to cement, the ingredients of cement react chemically with water and forms various complicated chemical compounds. The setting and hardening of cement is due to hydration and hydrolysis of its constituents. For Better understanding watch…
Manufacturing of cement | Process | Flow chart – civil learners
Manufacturing of Portland cement Following are the important operations involved in manufacturing of cement: 1) Mixing of raw materials 2) Burning 3) Grinding 4) Packing of cement Flow chart for manufacturing of cement Table Of Contents Mixing of raw materials: The processes used for the…
Classification of cement – Civil learners
Classification of cement INTRODUCTION: Cement is broadly described as a material having an adhesive and cohesive property with the capacity to bond the material like stone, bricks, building blocks, etc. Cement is a binder, a substance that sets and hardens independently, and can bind other materials together. Cements are inorganic material that shows the cementing…
Preservation of timber | Methods – civil learners
PRESERVATION OF TIMBER Timber has to be preserved from moisture, dry rot or internal decay and from the attacks ofinsects. Paint on seasoned timber preserves it from moisture and extends its life indefinitely ifrenewed periodically. Many processes has been adopted for protecting the timber from dry rot andinsects by impregnating it with chemical substances. Tarring,…
Storage of timber on site – civil learners
STORAGE OF TIMBER The converted timbers should be properly stored. For the purpose of storage, suitable stacks of timber pieces are formed. The timber pieces are arranged in layers and the layers are separated by wooden spacers. The stock is protected from direct sun, dry wind and rain. The image explains more than the words…
Conversion of timber | Methods – civil learners
CONVERSION OF TIMBER The cutting up of timber to form planks, battens, etc. of required sizes by saw is called conversion. Power machines are employed in several stages when working on a large scale. During conversion the allowance should be made for shrinkage, squaring and planning. It is about 3 mm to 6 mm. The…