Showing papers on "Polymer concrete published in 1974"
TL;DR: The compressive strength of sulphur-impregnated concrete (SIC) with 8.4 per cent sulphur by weight is 174 MN/m2 (25,300 psi) as mentioned in this paper.
15 citations
TL;DR: In this article, the compressive modulus and compressive strength of concrete concretes were determined and found to be a function of the total porosity of the concrete.
Abstract: Concrete has been impregnated with a particular epoxy system using a combined vacuum-pressure technique. Compressive modulus and compressive strength of these concretes were determined and found to be a function of total porosity. Results are compared with data previously reported for polymer concretes based on other monomer systems.
11 citations
TL;DR: In this paper, the authors discuss the importance of having reliable data on CREEP DEFORMATION, HEAT STABILITY, and MOISTURE RESISTANCE for selecting an EH agent.
Abstract: EPOXY ADHESIVES ARE NOW BEING USED TO AN INCREASING DEGREE IN PRECAST PRESTRESSED CONCRETE APPLICATIONS. THIS IS ESPECIALLY EVIDENT IN SEGMENTAL BRIDGE CONSTRUCTION. THE AUTHOR REVIEWS THE PROPERTIES OF STRUCTURAL ADHESIVES AND LISTS THE IMPORTANT CRITERIA FOR SELECTING EPOXY ADHESIVES. IN PARTICULAR, HE EMPHASIZES THE IMPORTANCE OF OBTAINING RELIABLE DATA ON CREEP DEFORMATION, HEAT STABILITY, AND MOISTURE RESISTANCE. TEST RESULTS OF A COMPREHENSIVE LABORATORY PROGRAM ON THE CREEP BEHAVIOR OF EPOXY MORTARS ARE PRESENTED.
9 citations
TL;DR: Aqueous suspensions of polymers, e.g., polyvinyl thermoplastics or latexes, have been applied to concrete mixtures as discussed by the authors to improve compressive strength.
Abstract: Polymer-cement concrete (PCC) is prepared by integrally mixing water solutions or emulsions of polymers or polymerizable components of monomers with cement and aggregate. The introduction of various organic materials to concrete mixtures has been tried, but up to 1973 only preliminary results have been reported in the literature. The most commonly used polymers for this purpose have been aqueous suspensions of polymers, e.g., polyvinyl thermoplastics or latexes. Water solutions of polymers, such as certain thermosetting resins, or polymerizable components of monomer systems, e.g., epoxies, have also been tried. Under the best conditions compressive strength improvements over comparable plain concrete of approx. 50% have been reported with relatively high polymer concentrations of 30% or more. In many cases materials poorer than the plain concrete were obtained. This was explained by the fact that the organic materials applied interfered with the hydration process of the cement.
8 citations
4 citations
01 Apr 1974
TL;DR: In this paper, a mechanized method for measuring the cement content of concrete is described. But the method is not suitable for concrete with silt, and the standard deviation increases to 31 g when the silt is used.
Abstract: Following an assessment of the requirements of the construction industry, a mechanized apparatus to measure the cement content of fresh concrete has been devised. This report describes the apparatus, its operation and testing. The sequence of procedure built into the apparatus starts with the elutriation of a weighed sample of concrete with water, whereby cement and other fine particles are separated as a slurry. This is followed by sub-sampling, flocculation and measurement of the cement by weight in a constant volume vessel. The process takes five minutes and is controlled by a preset sequence timer. Details of the functions involved are given and their effect on overall precision and accuracy are discussed. In the absence of silt (i.e. aggregate of cement fineness), it is shown that the cement content of an 8 kg sample of concrete can be measured with a standard deviation of 21 g. A simple procedure for dealing with concretes containing appreciable amounts of silt is described; when this procedure is adopted, the standard deviation increases to 31 g. Future developments are outlined. These include analysis of fresh concrete for water content, aggregate grading and possibly pulverized-fuel ash content.
4 citations
Book•
01 Nov 1974
TL;DR: In this paper, the effects of entrained air on the properties of both fresh and hardened concrete, and guidance on the methods of achieving the desired air content in various mix concentrations.
Abstract: The value of air entrainment in improving the frost resistance of concrete has been amply demonstrated. This booklet describes the effects of entrained air on the properties of both fresh and hardened concrete, and gives guidance on the methods of achieving the desired air content in various mix concentrations. The relevant clauses of BS 1881, part 2 "methods of testing fresh concrete", are given as an appendix.(a) /TRRL/
2 citations