ACCEPTANCE OF CONCRETE CUBE TEST RESULTS ACI-5.6 2008 requires that all the tests to be performed on fresh, hardened or old concrete are to be performed by qualified field testing technicians. They should collect and prepare all the specimens for testing and should record temperature and other important information about the fresh concrete. 1. Frequency(…)
NEW TECHNOLOGIES The energy auditor may consider the potential of implementing and integrating new technologies within the facility. It is, therefore, important that the energy auditor understands these new technologies and knows how to apply them. Among the new technologies that can be considered for commercial and industrial buildings include: 1. Building Envelope Technologies Recently,(…)
Ferro-cement In Construction < ?xml:namespace prefix = o /> Ferro-cement is a relatively new material consists of wire meshes and cement mortar. Developed by P.L.Nervi, an Italian architect in 1940. Widely used due to the low self weight, lack of skilled workers, no need of framework etc. Quality of ferro-cement works are assured because the(…)
The testing of concrete cores is carried out according to the ASTM Standard C 42. The diameter of core specimens for the determination of concrete compressive strength should preferably be at least three times the nominal maximum size of the coarse aggregate used in the concrete, and must be at least twice the maximum size of the coarse aggregate in the core sample.
Because precast concrete can be cast at ground level in factory conditions, it has these added features: Better Finishes: Better finishes can be obtained with precast concrete because the inside surface of the mould is kept in good condition. There is no grout loss, such as that from badly fitting formwork, which results in poor(…)
TYPES OF PRECAST COMPONENTS IN A BUILDING: The figure below shows the basic precast structure. The numbers of different types of components in these structures over the years have become very large. But following figure shows the major types of precast components in a building. Precast Beams: There are two main categories of beams: Internal(…)
The analysis of a framed building with shear walls subjected to horizontal and vertical load is essentially a three-dimensional problem. With the proliferation of computer programs available a three-dimensional analysis presents no great difficulty provided the modeling techniques fully reflect the behavior of the structure. The only penalty is time. Sometimes, especially where a dynamic(…)
The four essential features of a successful repair are: 1. Expediency: The longer the repair is left, the more work has to be done, and the less likely that the repair will blend in. 2. Cleanliness: when repairing concrete, care must be taken to remove any dirt or dust that will prevent the repair concrete(…)