Freeze-thaw cycles are one of the greatest threats to concrete durability. Lately, protection against this threat excites scientists’ attention. Air-entraining admixtures have been widely used to produce freeze-thaw resistant at concretes. The use of airentraining agents (AEAs) enhances not only freeze-thaw endurance but also the properties of fresh concrete such as segregation, bleeding and fl...

Since last few years cement replacement materials with industrial by-products and agricultural wastes in concrete production are widely used. It imparts positive environmental effect because the waste materials are not released to the environment. It was reported that the leakage of motor oil onto concrete surfaces in old grinding units increased the resistance such concrete to freezing and tha...

Today concrete is most widely used construction material due to its good compressive strength and durability. Depending upon the nature of work the cement, fine aggregate, coarse aggregate and water are mixed in specific proportions to produce plain concrete. Plain concrete needs congenial atmosphere by providing moisture for a minimum period of 28 days for good hydration and to attain desired ...

Natural fibres such as jute were the forerunners of the man-made fibres used for centuries for making ropes and formanufacturing burlaps, sacks, hessian and carpet backing. But the use of jute products in civil engineering is relativelywidespread for such purposes as sand-bags for concrete curing, soil enrichment and protection. This research is concerned with the stabilization of fine sand usi...

This work proposed to incorporate the sugarcane bagasse ash (SBA) with a high content of organic matter (loss on ignition 35.87%) in alkali-activated mixtures blast furnace slag. After grinding SBA, replacement ratios 10%, 20%, and 30% ground were used for flowability evaluation. The containing 20% showed dry consistency, then only mixture 10% slag was other tests. use an air-entraining admixtu...

As part of an extensive research program exploring the potential benefits using air-entraining admixtures in mine backfill, experimental study presented this paper investigates effect cement and entrained air dosages on backfill unconfined compressive strength (UCS), fresh density, dry density. Backfill specimens were prepared silica sand, normal Portland cement, water, admixture. An design wit...

Concrete patch repair has long been used to repair the damaged concrete structures. In cold regions, freeze– thaw cycle is one of the major damage factors. Not only the material itself is damaged by freeze–thaw cycles, but also the adhesive interface, which is regarded as the weakest part of composite system, degrades under freeze–thaw cycles. Air entraining agent has long been used to increase...