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首頁> 美國衛(wèi)生研究院文獻>Materials >Mechanical Behavior of Brick Masonry in an Acidic Atmospheric Environment
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Mechanical Behavior of Brick Masonry in an Acidic Atmospheric Environment

機譯：酸性大氣環(huán)境下砌體的力學行為

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In order to evaluate the deterioration regularity for the mechanical properties of brick masonry due to acid rain corrosion, a series of mechanical property tests for mortars, bricks, shear prisms, and compressive prisms after acid rain corrosion were conducted. The apparent morphology and the compressive strength of the masonry materials (cement mortar, cement-lime mortar, cement-fly ash mortar, and brick), the shear behavior of the masonry, and the compression behavior of the masonry were analyzed. The resistance of acid rain corrosion for the cement-lime mortar prisms was the worst, and the incorporation of fly ash into the cement mortar did not improve the acid rain corrosion resistance. The effect of the acid rain corrosion damage on the mechanical properties for the brick was significant. With an increasing number of acid rain corrosion cycles, the compressive strength of the mortar prisms, and the shear and compressive strengths of the brick masonry first increased and then decreased. The peak stress first increased and then decreased whereas the peak strain gradually increased. The slope of the stress-strain curve for the compression prisms gradually decreased. Furthermore, a mathematical degradation model for the compressive strength of the masonry material (cement mortar, cement-lime mortar, cement-fly ash mortar, and brick), as well as the shear strength attenuation model and the compressive strength attenuation model of brick masonry after acid rain corrosion were proposed.
機譯：為了評估酸雨腐蝕引起的磚石砌體機械性能的劣化規(guī)律，對酸雨腐蝕后的灰漿，磚塊，剪切棱鏡和壓縮棱鏡進行了一系列力學性能測試。分析了砌體材料（水泥砂漿，水泥石灰砂漿，水泥粉煤灰砂漿和磚）的表觀形態(tài)和抗壓強度，砌體的剪切性能以及砌體的抗壓性能。水泥-石灰砂漿棱鏡的耐酸雨腐蝕性能最差，粉煤灰摻入水泥砂漿中并不能提高耐酸雨腐蝕性能。酸雨腐蝕損害對磚的機械性能的影響是顯著的。隨著酸雨腐蝕循環(huán)次數(shù)的增加，砂漿棱柱的抗壓強度以及磚石砌體的抗剪和抗壓強度先增大然后減小。峰值應力先增大然后減小，而峰值應變逐漸增大。壓縮棱鏡的應力-應變曲線的斜率逐漸減小。此外，還建立了砌體材料（水泥砂漿，水泥石灰砂漿，水泥粉煤灰砂漿和磚）抗壓強度的數(shù)學退化模型，以及磚砌體的抗剪強度衰減模型和抗壓強度衰減模型。提出了酸雨腐蝕后。

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