Polymers in Concrete. Recent Development. 2. Recent Development of Polymer-Modified Concrete and Mortar.

Development of Economical Polymer-modified Concrete for Repair of Concrete Structures in Pakistan

Being well recognized in repair, rehabilitation and maintenance of concrete structures, polymer modified concretes are new high-performance materials. The present study was focused on the availability and use of polymer-modified concrete under local conditions in Pakistan. Various polymer compositions with subsidiary chemicals were prepared in the laboratory, and their feasibility in the repair...

Recent developments in concrete nondestructive evaluation

Concrete is a multi-phase composite material which is difficult to inspect using conventional ultrasonic techniques, including those that work well on relatively homogeneous materials such as metals. This paper summarizes recent research that makes use of signal processing techniques to overcome ultrasonic inspection difficulties in concrete. Basic findings from several new laboratory-based NDE...

Bond Development Between Carbon Fiber Reinforced Polymers and Concrete

Carbon fiber reinforced polymer (CFRP) sheets can be externally bonded for retrofit of concrete structures, improving flexure and sheer strength in the concrete. The key to CFRP sheets is the bond to the concrete, as bond is the means to transfer stress between the tow sheet and the concrete. Experimentation has been conducted to test a current market fiber-resin system, and to develop a resin ...

Recent Development in Control of Threileria annulata in Iran

Recent Innovation for Concrete Highway Bridges

A new generation of concrete highway bridges has recently been built in Canada using new design concepts and advanced materials for reinforcing and prestressing concrete . This paper describes briefly the design and construction of three bridges. The first smart concrete highway bridge (Centre Street, Beddington Bridge, Calgary, Alberta) is prestressed by carbon fiber reinforced plastic (CFRP) ...