Strength and deformability of hollow concrete blocks: correlation of block and cylindrical sample test results

Barbosa, Claudius de Sousa; Hanai, João Bento de

doi:10.1590/s1983-41952009000100005

Cited by 18 publications

(20 citation statements)

References 3 publications

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“…The blocks were molded with concrete mixes with four different strengths. This technique ensures that the mechanical properties from concrete specimens adequately represent the behavior of hollow concrete blocks (Barbosa 2004). Concrete hollow block are manufactured utilizing a zero slump concrete, together with high pressure and vibration of the molds, which is not reproduced here.…”

Section: Resultsmentioning

confidence: 99%

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On the compressive strength prediction for concrete masonry prisms

2009

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The results of a combined experimental program and numerical modeling program to evaluate the behavior of ungrouted hollow concrete blocks prisms under uniaxial compression are addressed. In the numerical program, three distinct approaches have been considered using a continuum model with a smeared approach, namely plane-stress, plane-strain and threedimensional conditions. The response of the numerical simulations is compared with experimental data of masonry prisms using concrete blocks specifically designed for this purpose. The elastic and inelastic parameters were acquired from laboratory tests on concrete and mortar samples that constitute the blocks and the bed joint of the prisms. The results from the numerical simulations are discussed with respect to the ability to reproduce the global response of the experimental tests, and with respect to the failure behavior obtained. Good agreement between experimental and numerical results was found for the peak load and for the failure mode using the three-dimensional model, on four different sets of block/mortar types. Less good agreement was found for plain stress and plain strain models.

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Section: Resultsmentioning

confidence: 99%

“…Laboratory tests were carried out on hollow concrete blocks, masonry prisms, and concrete and mortar samples that constitute the masonry elements. The adopted technique was to mold the blocks in the laboratory using a concrete mix also used to cast concrete samples (Barbosa 2004).…”

Section: Introductionmentioning

confidence: 99%

On the compressive strength prediction for concrete masonry prisms

2009

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“…The elastic modulus of masonry is typically determined from the secant modulus of the linear part of the compressive stress–strain curve, which is typically defined at a stress level equal to 40% of the ultimate compressive strength elsewhere (Barbosa and Hanai, 2009; Zhou et al, 2017). Table 2 shows that the average elastic modulus of types BH-290, BC-240, and BH-240 is similar at 11,603, 12,131, and 11,199 MPa, respectively.…”

Section: Experimental Studymentioning

confidence: 99%

“…Various light and easy-to-handle designs that maintain structural resistance were identified. Barbosa and Hanai. (2009) carried out a study to correlate mechanical properties of hollow concrete blocks and mechanical properties of the concrete that constitutes hollow concrete blocks.…”

Section: Introductionmentioning

confidence: 99%

Compressive performance of new types of load-bearing horizontal-hole interlocking concrete hollow blocks

Liu

Zhang

Liu

et al. 2018

Advances in Structural Engineering

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Two series of load-bearing horizontal-hole interlocking hollow concrete blocks, referred to as H-shaped series and cross-shaped series, were developed, including three geometric types: type BH-290 (H-shaped), type BH-240 (H-shaped), and type BC-240 (cross-shaped). The research presented in this article investigated the compressive behavior of the proposed load-bearing horizontal-hole interlocking hollow concrete blocks and aimed at analyzing the influence of geometric parameters on the block capacity. First, compressive tests of the horizontal-hole interlocking hollow concrete blocks were carried out. The compressive strength, elastic modulus, and compressive failure mechanism were analyzed. Second, the feasibility of the finite element analysis model was verified by experimental results presented in this article, as well as by available test data from other researchers. The influences of vertical ribs, horizontal ribs, and concrete strength on the compressive strength of horizontal-hole interlocking hollow concrete blocks were investigated. Ultimately, based on the numerical modeling results, linear equations were proposed to predict the compressive strength of H-shaped series and cross-shaped series blocks. The results show that the compressive strengths of types BH-240, BH-290, and BC-240 are 15.9, 13.4, and 13.0 MPa, respectively. For the H-shaped series, the core horizontal rib is the key part that can significantly constrain the vertical ribs so that the block can achieve higher compressive bearing capacity. For the cross-shaped series, core horizontal ribs cannot improve the compressive strength of the block because core horizontal ribs and joints near them become damaged early. Improving the concrete strength and the width of the vertical rib can effectively improve the compressive bearing capacity for both H-shaped and cross-shaped series blocks. The accuracy of the proposed equations for predicting the compressive strength of H-shaped and cross-shaped blocks is acceptable, according to the current verification.

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“…This is basically due to the hollowness of the blocks, which results in a reduction in the area resisting the compressive load applied. In addition, in masonry technology, the compressive strengths of elements made from similar constituent materials are usually affected by the confinement effect (Barbosa and Hanai, 2009), which means that bricks and blocks made from similar constituents tend to display different compressive strengths due to differences in geometries/external dimensions. In most cases, brick units usually displays higher strength due to their compact size (Hendry, 1998).…”

Section: Construction Materialsmentioning

confidence: 99%