风积砂掺量对砂浆混凝土性能影响及机理研究

Influence of Aeolian Sand Content on Mechanism of Mortar and Concrete

用一定掺量(10%、20%、30%、40%、50%、60%质量分数)的榆林地表风积砂替代普通河砂配置风积砂砂浆及混凝土,以期研究风积砂掺量对砂浆、混凝土和易性及抗压强度的影响。从砂子的粒径、粒形、级配情况及SiO_2、Al_2O_3的活化反应等角度讨论了风积砂掺量对砂浆、混凝土和易性及抗压强度的影响机理。实验结果表明,砂浆及混凝土的和易性与抗压强度随风积砂掺量的增加均经历了"先增后减"的变化过程,掺量为30%时砂浆的和易性显著改善,抗压强度提高最大;掺量为40%时,混凝土和易性最佳,抗压强度最高。所得结论对榆林及周边地区工程实际有一定参考价值。

Aeolian sand mortar and concrete were configured mixing with a certain dosage of Yulin aeolian sand （by mass fraction of 10% , 20% , 30% , 40% , 50% and 60% ） instead of ordinmy river sand. Influence of aeolian sand content was studied on the dosage and compressive strength of mortar and concrete. In view of the sand particle size, grain size, gradation as well as the activation reaction of SiO2 and Al2O3 etc. , the effect mechanism of aeolian sand content on the dosage and compressive strength of mortar and concrete was studied. It turned out that, both the dosage and the compressive strength of mortar and concrete increased at first and then decreased with the increase of aeolian sand content. The dosage of the specimen was improved significantly and the compressive strength was greatest when the aeolian sand content was 30% for the mortar. It also had a same impact rules on the concrete when the aeolian sand content was 40%. The conclusion has certain reference value for practical engineering of Yulin and surrounding areas.