The Feasibility Study on Application of Slag Mixed Sand in Masonry Mortar

随着我国经济稳步增长、经济发展步入新常态的趋势，建筑业仍是国民经济蓬勃发展的重要支柱和富民产业，混凝土、砂浆等建筑材料需求量的与日俱增给砂、石的供应带来了严峻的挑战，特别是天然河砂的产量难以满足建材市场的需求。随着对河砂的不断开采，河砂资源日趋枯竭，同时河砂的品质也大不如前，这就造成了建筑用河砂供求矛盾日益凸显。因此研究新的砂源和合格的细骨料已成为建筑材料发展的新趋势。与此同时，日益增加的城市生活垃圾处理不善，又会对城市周边生态环境造成严重危害。垃圾焚烧处理是垃圾资源化利用的重要途径，但焚烧剩下的10%~20%体积的炉渣仍需有效处理。因此，将经过特殊预处理的垃圾焚烧炉渣与天然河砂复配制成炉渣混...With the trend of Chinese economy growing steadily and economic development entering a new normal state, the construction industry is still an important pillar of the vigorous development of the national economy and enriching the industry. The increasing demands for concrete, mortar and other building materials have brought serious challenges to the supply of sand and stone, especially the product...学位：工学硕士院系专业：建筑与土木工程学院_工程硕士(建筑与土木工程)学号：2532014115180

不同系列缓凝型高效减水剂对混凝土收缩变形的影响

将同一品牌的萘系、脂肪族系、聚羧酸系缓凝型高效减水剂掺入混凝土中,研究它们对混凝土收缩变形的影响及其规律。结果表明:三种不同系列的缓凝型高效减水剂对混凝土早中期收缩变形不利影响由小到大依次为聚羧酸系、萘系、脂肪族系;对混凝土后期收缩变形不利影响由小到大依次为脂肪族系、聚羧酸系、萘系。从减小混凝土收缩变形的角度出发,在混凝土生产中应该慎用萘系高效减水剂,而聚羧酸系高性能减水剂是应用前景较好的高效减水剂

Measurement of integrated luminosity of data collected at 3.773 GeV by BESIII from 2021 to 2024

We present a measurement of the integrated luminosity e+e- of collision data collected by the BESIII detector at the BEPCII collider at a center-of-mass energy of Ecm = 3.773 GeV. The integrated luminosities of the datasets taken from December 2021 to June 2022, from November 2022 to June 2023, and from October 2023 to February 2024 were determined to be 4.995±0.019 fb-1, 8.157±0.031 fb-1, and 4.191±0.016 fb-1, respectively, by analyzing large angle Bhabha scattering events. The uncertainties are dominated by systematic effects, and the statistical uncertainties are negligible. Our results provide essential input for future analyses and precision measurements

Determination of the number of ψ(3686) events taken at BESIII

The number of ψ(3686) events collected by the BESIII detector during the 2021 run period is determined to be (2259.3±11.1)×106 by counting inclusive ψ(3686) hadronic events. The uncertainty is systematic and the statistical uncertainty is negligible. Meanwhile, the numbers of ψ(3686) events collected during the 2009 and 2012 run periods are updated to be (107.7±0.6)×106 and (345.4±2.6)×106, respectively. Both numbers are consistent with the previous measurements within one standard deviation. The total number of ψ(3686) events in the three data samples is (2712.4±14.3)×10^