Structural lightweight concrete made with rotary kiln produced structural lightweight aggregate solves weight and durability problems in buildings and exposed structures. Structural lightweight concrete has strengths comparable to normal weight concrete, yet is typically 25% to 35% lighter.Lightweight concrete mixture is made with a lightweight coarse aggregate and sometimes a portion or entire fine aggregates may be lightweight instead of normal aggregates. Structural lightweight concrete has an in-place density (unit weight) on the order of 90 to 115 lb / ft³ (1440 to 1840 kg/m³).Is lightweight concrete more expensive than normal weight Yes and no.The material unit cost of lightweight concrete is typically higher than that of normal-weight concrete, but the unit cost usually is more than offset by the overall reduction in concrete volume and steel tonnage for the structural system.Self-consolidating concrete is a highly flowable type of concrete that spreads into the form without the need for mechanical vibration. Self-compacting concrete is a non-segregating concrete that is placed by means of its own weight.High-performance concrete is a term used to describe concrete with special properties not attributed to normal concrete.High-strength concrete is typically recognized as concrete with a 28-day cylinder compressive strength greater than 6000 psi or 42 Mpa.If you need to use a paint that’s not Styrofoam friendly, you must first cover/seal the Styrofoam. There are many products used for this task, plaster of Paris being the most popular. However you can also use products like Mod Pod or surface textures. The best product to use is “Foam Finish”.
The concrete slump test measures the consistency of fresh concrete before it sets. It is performed to check the workability of freshly made concrete, and therefore the ease with which concrete flows.The slump test is used to ensure uniformity for different loads of concrete under field conditions.Place the cone next to the mound of wet concrete and put the steel bar level on top of it, extending over the top of the mound. Immediately measure the distance between the bottom of the steel bar and the top of the concrete mound. The distance, measured to the nearest 1/4 inch is the concrete slump.There are three types of slump that may occur in a slumps test, namely, true slump, shear slump and collapse slump. True slump refers to general drop of the concrete mass evenly all around without disintegration.Increased porosity also results in more efflorescence, causing the color of the surface to be less intense or whitish. Excessive slump also can result from accidentally adding too much water-reducing admixtures or super-plasticizers to a mix. This can result in aggregate segregation and a serious loss of strength.The straight leg raise, also called Lasègue’s sign, Lasègue test or Lazarević’s sign, is a test done during a physical examination to determine whether a patient with low back pain has an underlying herniated disc, often located at L5 (fifth lumbar spinal nerve).
Concrete slump test or slump cone test is to determine the workability or consistency of concrete mix prepared at the laboratory or the construction site during the progress of the work. Concrete slump test is carried out from batch to batch to check the uniform quality of concrete during construction.Adding just 1 gallon of water per cubic yard can: Increase slump 1 inch, decrease compressive strength 150 to 200 psi, waste about 1/4 bag of cement, and increase shrinkage by 10%. But water isn’t the only way to adjust slump. Consider adding a superplasticizer at the site to increase slump.Slump is the measure of concrete consistency and fluidity. It shows the flow and overall workability of freshly mixed concrete. Simply put, the higher the slump, the wetter the mix. Four-inch (4”) slump is very common with normal weight concrete and is a good for pumping.Depending upon the water cement ratio in the concrete mix, the workability may be determined by the following three methods. Slump Test. Compaction Factor Test. Vee-bee Consistometer Test.Pouring concrete is a straightforward job. You dig, form the mix and pour.A wet ground is not the best base for newly poured concrete. You can do a few things to help the ground dry up just enough for you to pour your concrete.The Slump test is really a variant of the SLR and the Lasègue’s tests performed in the seated position and is a progressive series of maneuvers designed to place the sciatic nerve roots under increasing tension.