It is easy to confuse the two because most people use the terms interchangeably. However, they are not the  same. Cement is but one of the critical ingredients of concrete. Cement is a fine gray powder used to bind  other ingredients to make concrete. Concrete, on the other hand, is the mixture of water, cement, and  aggregates in recommended proportions to form concrete products such as slabs, culverts, road channels etc.

It depends. There are two types of cement: hydraulic and non-hydraulic cement. Hydraulic cement can  harden under water and must be exposed to water to harden in normal circumstances. However, non hydraulic cement does not require water to harden. It hardens only when exposed to carbon dioxide and must  be kept dry to harden properly. 

Concrete fence support posts are short concrete fencing posts with an angular edge which are installed in a slanting position to give sturdy support to free-standing concrete posts. They are installed uniformly in  intervals along the fence and are placed on either side of a free-standing concrete post. 

Concrete fencing posts are generally installed with a spacing of 3 meters or 10 feet from each other.

It is important to get accurate dimensions of your land to compute the actual number of posts required to  fence off the property. Compute the estimated number of posts by taking the perimeter distance in meters,  divide that by the desired spacing in meters between each pole, and add one. This will give you the number of  free-standing concrete posts.  

To compute the number of support posts, consider the placement of the support posts after every free standing concrete post and take the total number of free-standing posts for each side of the land, divide by  the number of posts to skip (e.g., after every 10 posts, support posts should be installed) and multiply the  resulting number by two. Then add two posts for every corner of the land. 

There are many options to choose from: wooden, concrete, metal, plastic, and live fences. Each has its pros  and cons that must be considered to make the right decision e.g., cost, longevity, security, availability etc. For  example, if one lives in a termite prone area/region, wooden fencing posts may be damaged in the short term. If one lives in a highly humid region, metal fencing posts may result in high maintenance costs to keep them  from rusting. Concrete fencing posts are generally very sturdy and long lasting. Plastic fencing posts in hot  regions will warp over time.

Per the building code in Kenya, boundary walls, screen walls, fences, or other means of enclosure of  residential plots should not have a height greater than 4ft. 6 in. where such fence is adjacent to a street or in front of a main building; or 6ft. in any other case. For commercial property, the height shall be as required or  approved by the council. 

Chain-link and Barbed Wire for fencing purposes are graded as high tensile or low tensile wire. Generally,  high tensile wire has high carbon steel, while low tensile wire has low carbon steel. Simply put, the higher the  carbon steel in the wire, the stronger the wire.  

IDBs or Inverted Drainage Blocks are used to channel water through deep trenches and especially where  there is an expectation of high-volume surface run offs and drainage needs e.g., along highways. Shallow  drains on the other hand are used to channel surface run off from flat low-lying land surfaces and act as the  initial collection point for water diversion into larger drainage systems such as IDBs, Culverts etc. Shallow  drains are normally not used in deep trenches. 

Reinforced paving slabs have an embedded steel gauze or mesh to increase the strength of the concrete slab.  They are necessary where there is an expectation of heavy pedestrian or light vehicle traffic, and to cover  storm water drains. 

Prior to laying paving slabs, demarcate the area where the paving slabs will be installed. Remove all organic  material such a grass and other plants within the area, excavate a depth of approximately 150mm across the  area, add base material consisting of gravel and other aggregates, compact the base material, add a layer of  sand, do not compact the sand but evenly rack, distribute and smoothen it over the excavated area. You are  now ready to install the paving slabs.