404 results found
Alford NM, Birchall JD, 1985, Fibre toughening of MDF (macro-defect-free) cement
The effects of nylon, glass, and Kevlar (aromatic polyamide) fibres, as an alternative to asbestos fibres, on the mechanical properties of the cement have been assessed. The unreinforced matrix has a high modulus and strength, but the addition of the fibres is shown to improve the work of fracture and the impact performance.
McN Alford N, Birchall JD, 1985, PROPERTIES AND POTENTIAL APPLICATIONS OF MACRO-DEFECT-FREE CEMENT., Pages: 265-276, ISSN: 0272-9172
The properties of Macro-Defect-Free (MDF) cements are reviewed. Combinations of these properties place MDF cements in a unique position in the materials field, a position which makes direct replacement of current engineering materials such as metals plastics and ceramics a viable proposition. Perhaps of more importance is the invention of devices and components hitherto unavailable because of the property-restricted nature of available materials. Examples are given of unusual uses for cement. These include applications in the fields of cryogenics, ballistic protection, electromagnetic radiation screening and acoustics.
ALFORD NM, BIRCHALL JD, 1985, FIBER TOUGHENING OF MDF CEMENT, JOURNAL OF MATERIALS SCIENCE, Vol: 20, Pages: 37-45, ISSN: 0022-2461
Alford NMN, Birchall JD, Howard AJ, et al., 1984, MACRO-DEFECT FREE CEMENT - STRONG SOLIDS MADE EASY., Pages: 73-80
The high energy costs incurred in the extraction of raw materials and the manufacturing costs of strong solids such as metals, plastics and ceramics is of increasing concern. New inorganic materials based on macro defect free (MDF) cements are energy efficient, can have bending strengths of 200 MPa and fracture energies, when reinforced, of 50,000 Jm** minus **2. The authors describe the theory behind MDF cements and compare properties with other engineering materials. The MDF cements have adjustable combinations of properties which are novel and which require a revolutionary approach to materials selection and design.
PEARSON D, ALLEN A, WINDSOR CG, et al., 1983, AN INVESTIGATION ON THE NATURE OF POROSITY IN HARDENED CEMENT PASTES USING SMALL-ANGLE NEUTRON-SCATTERING, JOURNAL OF MATERIALS SCIENCE, Vol: 18, Pages: 430-438, ISSN: 0022-2461
ALLEN AJ, WINDSOR CG, RAINEY V, et al., 1982, A SMALL-ANGLE NEUTRON-SCATTERING STUDY OF CEMENT POROSITIES, JOURNAL OF PHYSICS D-APPLIED PHYSICS, Vol: 15, Pages: 1817-1833, ISSN: 0022-3727
Alford NMN, Double DD, 1982, Determination of porosity in hardened cement pastes in relation to strength, Studies in Surface Science and Catalysis, Vol: 10, Pages: 259-268, ISSN: 0167-2991
Porosity in a hardened cement paste influences the mechanical and engineering properties of the material. Studies have been made of the relation between porosity distribution and strength of hardened cements prepared by various methods. Pore size distribution was analysed using optical and electron microscopy, mercury intrusion porosimetry and gas adsorption techniques. Measurements of flexural strength indicate that strength is related to pore size distribution rather than total pore volume. Reasons for the discrepancies in pore volumes measured by pycnometry and M.I.P. techniques are discussed. © 1982, Elsevier Scientific Publishing Company
ALFORD NM, 1982, DYNAMIC CONSIDERATIONS OF FRACTURE IN MORTARS, MATERIALS SCIENCE AND ENGINEERING, Vol: 56, Pages: 279-287, ISSN: 0025-5416
ALFORD NM, GROVES GW, DOUBLE DD, 1982, PHYSICAL-PROPERTIES OF HIGH-STRENGTH CEMENT PASTES, CEMENT AND CONCRETE RESEARCH, Vol: 12, Pages: 349-358, ISSN: 0008-8846
ALFORD NM, RAHMAN AA, 1981, AN ASSESSMENT OF POROSITY AND PORE SIZES IN HARDENED CEMENT PASTES, JOURNAL OF MATERIALS SCIENCE, Vol: 16, Pages: 3105-3114, ISSN: 0022-2461
ALFORD NM, RAHMAN AA, SALIH N, 1981, THE EFFECT OF LEAD NITRATE ON THE PHYSICAL-PROPERTIES OF CEMENT PASTES, CEMENT AND CONCRETE RESEARCH, Vol: 11, Pages: 235-245, ISSN: 0008-8846
ALFORD NM, 1981, A THEORETICAL ARGUMENT FOR THE EXISTENCE OF HIGH-STRENGTH CEMENT PASTES, CEMENT AND CONCRETE RESEARCH, Vol: 11, Pages: 605-610, ISSN: 0008-8846
ALFORD NM, POOLE AB, 1980, USE OF THE FLOW CONE TEST IN THE PREDICTION OF THE PHYSICAL-PROPERTIES OF CEMENT MORTARS, CEMENT AND CONCRETE RESEARCH, Vol: 10, Pages: 263-276, ISSN: 0008-8846
Alford NMN, Poole AB, 1979, The effect of shape and surface texture on the fracture toughness of mortars, Cement and Concrete Research, Vol: 9, Pages: 583-589, ISSN: 0008-8846
Aggregate shape and surface texture expressed in terms of an angularity factor have been measured on 17 different rock aggregates using the flow cone test. Critical strain-energy release rates (GIc) were determined from centrally notched beams prepared from mortars using the same rock aggregates. The correlation coefficient between the two variables is 0.61, significant at the 99% confidence level. The correlation is explained in terms of the aggregates ability to arrest crack development, aggregate interlock effects and surface energy considerations. © 1979.
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