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Blockwork

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Gerald Müller – One of the best experts on this subject based on the ideXlab platform.

  • Wave effects on Blockwork structures: numerical models
    Journal of Hydraulic Research, 2010
    Co-Authors: Gerald Müller, G Wolters

    Abstract:

    Transient or fluctuating pressures, generated for example by a wave impact on a sea wall or a water jet plunging into a pool, have been shown to propagate into water filled cracks or fissures of structures and rock. Model studies revealed the characteristics of impact generated pressure pulses, which were observed to travel at very low speeds of 60–160 m/s and to attenuate, whereby higher frequencies were preferentially damped out. Other effects, such as reflection and dynamic amplification also indicated that the pulses constituted waves propagating through an elastic 2-phase medium consisting of water and a small amount of air. Based on these observations, concepts for a numerical model of pressure pulse propagation in water were developed and implemented. It was found that the numerical model approximates the physical model test results well, both in the linear and the non-linear range and including the transition from an initial steep pressure pulse to wave-like forms. The damping coefficient was foun…

  • Analysis of Blockwork coastal structures
    Coastal Engineering 2004, 2005
    Co-Authors: R Marth, Gerald Müller, G Wolters, A. Klavzar, W. Alsop, Tom Bruce

    Abstract:

    Blockwork coastal structures often suffer damages from breaking wave action. The type of damage observed suggests that wave impact induced pressure propagation into water filled cracks and the subsequent build-up of internal bursting pressures is the probable cause. A series of model tests was conducted to investigate structural aspects of this problem. The mechanism of seaward block removal was demonstrated for the first time, the internal stress distribution inside of Blockwork structures was analysed and the effect of wall inclination on internal pressures investigated. It was found that the structural characteristics and the geometry of Blockwork walls affect their load resistance significantly.

  • Field and large scale model tests of wave impact pressure propagation into cracks
    Coastal Engineering 2004, 2005
    Co-Authors: G Wolters, Gerald Müller, G. N. Bullock, Charlotte Obhrai, Howell Peregrine, Henrik Bredmose

    Abstract:

    Within a large & full scale study on wave impact induced pressures on coastal structures (BWIMCOST) an investigation of impact pressure propagation into structure cracks and fissures was carried out. The mechanism, which is held responsible for localized damage to existing Blockwork breakwaters, had previously been verified in small scale model tests and a numerical model had been developed. The current investigation is the first which describes the effect at full scale, with recorded pressures of up to 199 kPa found within the cracks. The experimental results are related to their possible impact on coastal structural integrity.

G Wolters – One of the best experts on this subject based on the ideXlab platform.

  • Wave effects on Blockwork structures: numerical models
    Journal of Hydraulic Research, 2010
    Co-Authors: Gerald Müller, G Wolters

    Abstract:

    Transient or fluctuating pressures, generated for example by a wave impact on a sea wall or a water jet plunging into a pool, have been shown to propagate into water filled cracks or fissures of structures and rock. Model studies revealed the characteristics of impact generated pressure pulses, which were observed to travel at very low speeds of 60–160 m/s and to attenuate, whereby higher frequencies were preferentially damped out. Other effects, such as reflection and dynamic amplification also indicated that the pulses constituted waves propagating through an elastic 2-phase medium consisting of water and a small amount of air. Based on these observations, concepts for a numerical model of pressure pulse propagation in water were developed and implemented. It was found that the numerical model approximates the physical model test results well, both in the linear and the non-linear range and including the transition from an initial steep pressure pulse to wave-like forms. The damping coefficient was foun…

  • Analysis of Blockwork coastal structures
    Coastal Engineering 2004, 2005
    Co-Authors: R Marth, Gerald Müller, G Wolters, A. Klavzar, W. Alsop, Tom Bruce

    Abstract:

    Blockwork coastal structures often suffer damages from breaking wave action. The type of damage observed suggests that wave impact induced pressure propagation into water filled cracks and the subsequent build-up of internal bursting pressures is the probable cause. A series of model tests was conducted to investigate structural aspects of this problem. The mechanism of seaward block removal was demonstrated for the first time, the internal stress distribution inside of Blockwork structures was analysed and the effect of wall inclination on internal pressures investigated. It was found that the structural characteristics and the geometry of Blockwork walls affect their load resistance significantly.

  • Field and large scale model tests of wave impact pressure propagation into cracks
    Coastal Engineering 2004, 2005
    Co-Authors: G Wolters, Gerald Müller, G. N. Bullock, Charlotte Obhrai, Howell Peregrine, Henrik Bredmose

    Abstract:

    Within a large & full scale study on wave impact induced pressures on coastal structures (BWIMCOST) an investigation of impact pressure propagation into structure cracks and fissures was carried out. The mechanism, which is held responsible for localized damage to existing Blockwork breakwaters, had previously been verified in small scale model tests and a numerical model had been developed. The current investigation is the first which describes the effect at full scale, with recorded pressures of up to 199 kPa found within the cracks. The experimental results are related to their possible impact on coastal structural integrity.

An Fried – One of the best experts on this subject based on the ideXlab platform.

  • Flexural strength of low density Blockwork
    Construction and Building Materials, 2012
    Co-Authors: Ash Ahmed, An Fried

    Abstract:

    Abstract The characteristic flexural strength of low density aircrete wallettes (2.8 and 2 N/mm 2 ) incorporating both conventional and thin layer mortar is verified. The wallettes are tested in accordance with British and European standards. The flexural strength of aircrete wallettes is derived from the strength of small specimens tested to destruction under four-point loading. The strengths of the wallettes are high with impressive repeatability with the maximum strength being reached for thin layer wallettes within 7 days curing time. In general the strengths of both conventional mortar and thin layer mortar wallettes compare favourably to values reported in the standards.

  • Flexural behaviour of thin joint concrete Blockwork: Experimental results
    Construction and Building Materials, 2011
    Co-Authors: O.j. Kanyeto, An Fried

    Abstract:

    Abstract This paper presents a report of an experimental investigation of the behaviour of thin joint concrete Blockwork in flexure. Two concrete block types and one thin layer mortar type were used to build wallettes and wall panels, which were then tested to failure. Graphs plotted from the test data revealed a combination of linear and non-linear relationships between the load and displacement. The investigation also revealed that the transverse lateral load capacity of masonry built using solid dense concrete blocks with thin joint mortar is considerably higher (up to 3.5 times) than that of similar Blockwork constructed using conventional mortar. Both the mortar properties and the constituents of the parent material forming the block appear to alter the joint strength resulting in enhancements to flexural tensile bond strength. The results also indicate that when thin joint technology is employed, in conjunction with solid dense concrete blocks, the masonry behaves more as a concrete plate than conventional Blockwork.

  • THIN LAYER CONCRETE Blockwork IN FLEXURE
    , 2011
    Co-Authors: An Fried, Kanyeto O

    Abstract:

    The adhesion between polymer modified mortars and concrete block masonry was examined to determine any enhancement to the bond. A test programme was undertaken to evaluate this trend. Two concrete block types and one thin layer mortar type were used to build wall panels which were then tested to failure. The results showed that both the mortar properties and the constituents of the parent material forming the block alter the joint strength, resulting in enhancements to flexural tensile bond strength. The transverse lateral load capacity of masonry built using solid dense concrete blocks with thin joint mortar is up to 3.5 times that of similar Blockwork constructed using conventional mortar. This means that when thin joint technology is used, in conjunction with solid dense concrete blocks, the masonry behaves more as a concrete plate than conventional Blockwork. Graphs plotted from the test data reveal a bi-linear relationship between the load and displacement, from initial application of the load until failure