郭佳慶1,2,馬艷霞1,2,聶思凡1,2,魯生斌1,2,白繼雄3
郭佳慶,馬艷霞,聶思凡,等.硫酸鹽漬土地區粉煤灰混凝土抗壓強度研究[J].混凝土與水泥制品,2022(7):35-39.
GUO Jia-qing1,2, MA Yan-xia1,2, NIE Si-fan,et al.Research on the Compressive Strength of Fly Ash Concrete in the Sulfate-saline Soil Area[J].China Concrete and Cement Products,2022(7):35-39.
硫酸鹽漬土地區粉煤灰混凝土抗壓強度研究
郭佳慶1,2,馬艷霞1,2,聶思凡1,2,魯生斌1,2,白繼雄3
郭佳慶,馬艷霞,聶思凡,等.硫酸鹽漬土地區粉煤灰混凝土抗壓強度研究[J].混凝土與水泥制品,2022(7):35-39.
GUO Jia-qing1,2, MA Yan-xia1,2, NIE Si-fan,et al.Research on the Compressive Strength of Fly Ash Concrete in the Sulfate-saline Soil Area[J].China Concrete and Cement Products,2022(7):35-39.
摘 要:為了探究硫酸鹽漬土地區粉煤灰混凝土抗壓強度隨侵蝕時間的變化規律,在某典型硫酸鹽漬土地區埋置不同粉煤灰摻量(0、10%、15%、20%)的混凝土試件進行了硫酸鹽侵蝕后的抗壓強度試驗和微觀形貌分析,并基于BP神經網絡模型預測了試件的抗壓強度。試驗結果表明:不同粉煤灰摻量試件的抗壓強度均隨著侵蝕時間的增加先升高后降低;當粉煤灰摻量為10%時,試件的抗壓強度最高。SEM分析表明:540 d時大部分試件出現了微裂縫,840 d時試件均發生了劣化,但尚未破壞;當粉煤灰摻量為10%時,試件的劣化不明顯;預測結果表明,侵蝕時間是影響摻粉煤灰混凝土試件抗壓強度的最主要因素。
Abstract: In order to explore the change rules of the compressive strength of fly ash concrete with erosion time in the sulfate-saline soil area, concrete specimens with different fly ash content(0, 10%, 15%, 20%) were embedded in a typical sulfate-saline soil area, and the compressive strength test and microscopic morphology analysis after sulfate erosion were carried out. The compressive strength of the specimen was predicted based on the BP neural network model. The test results show that the compressive strength of fly ash concrete with different fly ash content increases first and then decreases with the increase of erosion time. At different erosion time nodes, when the fly ash content is 10%, the compressive strength of the specimen is the highest. The SEM results show that at 540 d, most of the specimens appear micro-cracks. At 840 d, all the specimens are deteriorated, but not damaged. When the fly ash content is 10%, the deterioration of the specimens is not obvious. The prediction results show that erosion time is the main factor affecting the service performance of fly ash concrete.
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