Concrete composite

Concrete is a particulate composite of stone and sand, held together by an adhesive. The adhesive is usually a cement paste (used also as an adhesive to join bricks or stones), but asphalt or even polymers can be used to give special concretes. In this chapter we examine three cement pastes the primitive pozzolana the widespread Portland cement and the newer, and somewhat discredited, high-alumina cement. And we consider the properties of the principal cement-based composite, concrete. The chemistry will be unfamiliar, but it is not difficult. The properties are exactly those expected of a ceramic containing a high density of flaws. 

A composite concrete slab or a stressed-skin system can also provide a roof diaphragm, but the latter may severely restrict the provision of subsequent roof penetrations. Concrete roof slabs are unusual, due to the greatly increased mass over the more normal metal decking/in-sulation/waterproof membrane or insulated metal decking options. 

Fig. 6.12 Comparison of 24 h early volume change using low and high dosages of expansive admixtures vs Type K cement. (Courtesy Mailvaganam, N., Nunes, S. and Bhagrath R. (1993). Effectiveness of expansive admixtures in structural grout compositions, Concrete International, 15(10), 38-43.

University of Illinois Urbana-Champaign. Materials Science and Technology. Available online. URL http //matsel.mse.uiuc.edu/ tw/. Accessed May 28, 2009. Thanks to the hard work of dozens of high school teachers, as well as a number of college professors and students, this Web site presents a highly informative set of pages on the science of materials. There are modules on ceramics, metals, polymers (plastics), composites, concrete, and more. 

Fibre Bragg grating sensors are a type of optical sensor that has received considerable attention in recent years. They are used for monitoring the structural condition of fibre-reinforced composites, concrete constructions or other construction materials. 

Wood, treated Wood, untreated Composite Concrete Test pile Load test... 

Karbhari VM, Zhao L Issues related to composite plating and environmental exposure effects on composite-concrete interface in external strengthening. Composite Structures, 1997 40(3-1) 293-304. DOI 10.1016/s0263-8223(98)00031-2. 

Canning, L., Hollaway, L., and Thorne, A.M. (1999), Manufacture, testing and numerical analysis of an innovative polymer composite/concrete structural unit , Proc. Inst. Civ. Engrs Structs Bldgs, 134, 231-241... 

Several proposals were investigated but the one that was finally accepted was replacement of the existing fill with a composite concrete saddle, and CFRP strengthening to the intrados of the arch to raise the structure to full HA loading. The proposal included the installation of a cathodic protection system to minimise the risk of steel reinforcement corrosion in the future, and replacement of the existing substandard parapets with new concrete parapets. 

An innovative hybrid beam of rectangular cross-section composed of concrete placed in its compressive region and a high specihc strength/stiffness FRP composite situated in the tensile region was presented by Triantahllou and Meier (1992), Deskovic and Triantahllou (1995) and Triantahllou (1995), Canning etal. (1999). This system was extended to form a composite/concrete duplex beam for both a standard rectangular and a Tee beam cross-section... 

Hulatt, J., Hollaway, L. C. and Thorne, A. M. (2004), A novel advanced polymer composite/ concrete structural element . Proceedings of the Institution of Civil Engineers, Special Issue Advanced Polymer Composites for Structural Applications in Construction, February 2004, pp. 9-17. 

The selection of an appropriate model is made according to its ability to represent experimental results and also its simplicity. The properties of cement paste are not the only factors determining the behaviour of cement-based composites, concretes, mortars, fibre concretes, etc. Other components of the fresh mix, their volume fractions and properties are also important. That is why, for practical considerations, it is not necessary to use very complicated models for the cement paste. 

Kochavi, E., Kivity, Y, Anteby, I., Sadot, O. and Ben-Dor, G, 2008. Numerical model of composite concrete walls, in Proceedings of the 9th Biennial ASME Conference on Engineering Systems Design Analysis, ESDA2008, Haifa, Israel. 

A composite concrete material containing polymers and cement has superior properties to those of conventional concrete. Several types of polymer concretes have been fabricated and examined for their... 

Seismic Analysis of Steel-Concrete Composite concrete slab in compression (component 1), (c) krnemat-Buildings Numerical Modeling, Fig. 13 Component ics of the concrete slab in tension (component 5), and (d) model (a) overall joint model, (b) kinematics of the overall exterior joint model... 

Santos PMD, Julio ENBS (2013) A state-of-the-art review on roughness quantification methods for concrete surfaces. Constr Build Mat J 38 912-923 Santos PMD, Julio ENBS (2014) Interface shear transfer on composite concrete members. ACI Struct Jlll(l) 113-121... 

The addition of a welded bottom haunch, with the existing low toughness beam flange groove welds left in-place, resulted in signiflcantly improved connection performance, which was dramatically influenced by the absence or presence of a composite concrete floor slab. In the former case, the specimens developed plastic rotations of 0.015 to 0.025 radian, whereas in the latter case developed plastic hinges in excess of 0.03 radian. 

A.A. Raouf, S.T.S. Al-Hassani and J.W. Simpson, Explosive testing of fibre reinforced cement composites . Concrete. 1976, 28-30. 

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