摘   要：收集了国内外已发表文献的168组试验数据并建立数据库，以15个影响因素为输入变量，抗压强度为输出变量，建立了决策树（DT）、随机森林（RF）、极端梯度提升树（XGBoost）三种机器学习模型对UHPC的抗压强度进行预测，并采用SHAP算法对模型进行了解释。结果表明：三种模型的预测误差百分比均在15%以内，模型预测收敛性较高，预测值和试验值相近，均具有较好的精度，其中，XGBoost模型的预测精度最高；在所选15个影响因素中，钢纤维掺量对UHPC抗压强度的影响最大；基于机器学习预测UHPC抗压强度具有一定的准确性和可靠性。 Abstract: A comprehensive database was constructed by collecting 168 sets of experimental data from both domestic and international literature. Using 15 influencing factors as input variables and compressive strength as output variable, three machine learning models of decision tree(DT), random forest(RF), and extreme gradient boosting tree(XGBoost) were developed to predict the compressive strength of UHPC. The SHAP framework was employed to interpret the three models. The results show that the prediction error percentages for all three models are within 15%, demonctrating high convergence and accuracy. The predicted values are similar to the experimental values and have good accuracy. Among them, the XGBoost model has the highest prediction accuracy. Among the 15 selected influencing factors, the steel fiber content has the most impact on the compressive strength of UHPC. It is confirmed that machine learning-based predictions of UHPC compressive strength possess a certain level of accuracy and reliability.

欧阳利军,石永超,丁斌,等.基于机器学习预测超高性能混凝土的抗压强度[J].混凝土与水泥制品,2025(3):1-7. OUYANG L J,SHI Y C,DING B,et al.Prediction of compressive strength of ultra-high performance concrete based on machine learning[J].China Concrete and Cement Products,2025(3):1-7.

摘   要：研究了抗分散剂掺量对硫铝酸盐水泥砂浆性能的影响。结果表明：随着抗分散剂掺量的增加，水泥浆体的流动性降低，凝结时间缩短，剪切应力与塑性黏度增加，但增幅降低；当抗分散剂掺量为2.0%时，砂浆的水样悬浊物含量、浊度、pH值显著降低，抗分散性能提高；加入抗分散剂后，砂浆的水陆强度比超过70%；抗分散剂的掺入提高了水泥浆体的累计放热量，提高了水泥的水化程度，且对水泥的水化产物组成没有影响；综合来看，当抗分散剂掺量为2.0%时，砂浆的综合性能最佳。 Abstract: The effect of anti-dispersion dosage on the properties of sulfoaluminate cement mortar was studied. The results show that with the increase of anti-dispersion dosage, the fluidity of cement slurry decreases, the setting time shortens, and the shear stress and plastic viscosity increase, but the growth rate decreases. When the dosage of anti-dispersion is 2.0%, the suspended solids content, turbidity, and pH value of the mortar water sample are significantly reduced, and the anti-dispersion performance is improved. After adding anti-dispersion, the water-to-land strength ratio of the mortar exceeds 70%. The addition of anti-dispersion increases the cumulative heat release of cement slurry, enhances the hydration degree of cement, and has no effect on the composition of cement hydration products. In general, when the dosage of anti-dispersion is 2.0%, the comprehensive performance of mortar is the best.

杨金栋,曾庆有,程沛媛,等.硫铝酸盐水泥砂浆的水下不分散性能研究[J].混凝土与水泥制品,2025(3):8-12,17. YANG J D,ZENG Q Y,CHENG P Y,et al.Study on underwater anti-dispersion performance of sulphoaluminate cement mortar[J].China Concrete and Cement Products,2025(3):8-12,17.

摘   要：研究了复合型膨胀剂掺量（0、8%、10%、12%）对C35、C40、C50混凝土的抗压强度、限制膨胀率、干燥收缩的影响。结果表明：掺入膨胀剂在一定程度上降低了混凝土的抗压强度，且对C50混凝土抗压强度的影响高于C35、C40混凝土；膨胀剂改善了混凝土的体积变形特性，随着膨胀剂掺量的增加，混凝土的限制膨胀率增加，干燥收缩基本呈降低趋势。 Abstract: The effects of composite expansion agent dosage(0, 8%, 10%, 12%) on the compressive strength, limited expansion rate, and drying shrinkage of C35, C40, and C50 concrete were studied. The results show that the addition of expansion agent can reduce the compressive strength of concrete to a certain extent, and its effect on the compressive strength of C50 concrete is higher than those of C35 and C40 concrete. The expansion agent improves the volumetric deformation characteristics of concrete. With the increasing of the expansion agent dosage, the limited expansion rate of concrete increases, and its drying shrinkage basically shows a downward trend.

岳盛海,李小聪,李刚,等.复合型膨胀剂对混凝土抗压强度及体积变形特性的影响[J].混凝土与水泥制品,2025(3):13-17. YUE S H,LI X C,LI G,et al.Influence of composite expansive agent on the compressive strength and volume deformation characteristics of concrete[J].China Concrete and Cement Products,2025(3):13-17.

摘   要：为了解决边坡施工和水库除险加固过程中的漏浆、塌孔等问题，研究了速凝剂、早强剂、膨胀剂、减水剂复掺对水泥基灌浆料的工作性和强度的影响。结果表明：速凝剂和减水剂掺量是影响灌浆料凝结时间的主要因素，推荐速凝剂掺量为1.5%，减水剂掺量为4.0%~5.0%；速凝剂和早强剂掺量对灌浆料流动性的影响比较显著，推荐速凝剂掺量为1.0%~1.5%，早强剂掺量为3.5%~4.0%；减水剂和膨胀剂掺量对灌浆料28 d抗压强度的影响比较显著，推荐减水剂掺量为3.0%，膨胀剂掺量可取4.0%。 Abstract: In order to solve the problems of grout leakage and hole collapse during slope construction and reservoir reinforcement, the effects of accelerator, early strength agent, expansion agent, and water reducing agent on the workability and strength of cement-based grouting materials were studied. The results show that the content of accelerator and water reducing agent are the main factors affecting the setting time of grouting materials. The recommended content of accelerator and water reducing agent is 1.5% and 4.0%~5.0%. The effects of the content of accelerator and early strength agent on the fluidity of grouting materials are significant. It is recommended that the content of accelerator is 1.0%~1.5%, and the content of early strength agent is 3.5%~4.0%. The content of water reducing agent and expansion agent has significant influence on the 28 d compressive strength of grouting materials. The recommended content of water reducing agent is 3.0%, and the content of expansion agent is 4.0%.

安亚强,武强,马梦娜,等.外加剂复掺对水泥基灌浆料性能的影响[J].混凝土与水泥制品,2025(3):18-21,27. AN Y Q,WU Q,MA M N,et al.Influence of admixture compounding on the properties of cement-based grouting materials[J].China Concrete and Cement Products,2025(3):18-21,27.

摘   要：研究了减缩剂（SRA）、膨胀剂（EA）对低热水泥砂浆干燥收缩、力学性能的影响。结果表明：随着SRA掺量的增加，其对砂浆干燥收缩的抑制效果先增加后降低，且对力学性能有不利影响；随着EA掺量的增加，其对砂浆后期干燥收缩的抑制效果增加，砂浆各龄期的抗压强度基本呈降低趋势，7 d内的抗折强度降低，7 d后抗折强度基本呈先略微增加后降低的趋势；SRA与EA复掺时，在低掺量下（SRA0.5%+EA2%）具有较佳的抑制干燥收缩效果，且对砂浆力学性能的负面影响较低。 Abstract: The effects of shrinkage reducing agent(SRA) and expansion agent(EA) on the drying shrinkage and mechanical properties of low heat cement mortar were studied. The results show that with the increase of SRA content, its inhibitory effect on drying shrinkage of mortar first increases and then decreases, and has adverse effects on mechanical properties. With the increase of EA content, its inhibitory effect on the drying shrinkage of mortar in the later stage increases. The compressive strength of mortar at various ages shows a decreasing trend, and the flexural strength within 7 d decreases, after 7 d, the flexural strength shows a trend of first slightly increasing and then decreasing. When SRA and EA are mixed together, it has a better effect on suppressing drying shrinkage at low content(SRA0.5%+EA2%), and has a lower negative impact on the mechanical properties of mortar.

李晓,牛雪岗,翁智财.减缩剂、膨胀剂对低热水泥砂浆干燥收缩与力学性能的影响[J].混凝土与水泥制品,2025(3):22-27. LI X,NIU X G,WENG Z C.Effect of shrinkage reducing agent and expansion agent on drying shrinkage and mechanical properties of low heat cement mortar[J].China Concrete and Cement Products,2025(3):22-27.

摘   要：通过1H低场核磁共振技术，研究了多孔浮石掺量及预处理方法对其吸水-释水过程的影响，分析了浮石在超高性能混凝土（UHPC）中的内养护机理。结果表明：浮石掺量对其吸水-释水过程的影响主要体现在水分迁移的特征参数（吸水量、放水量、吸水速率、放水速率）上，且会间接影响UHPC的水化进程；浮石不同预处理方法对UHPC内部孔隙大小、分布的影响主要集中在水化早期，对水化后期基本无影响，且此现象随浮石掺量的增加而更明显；与未预湿浮石相比，预湿浮石可以延迟水分的释放时间，有利于减缓UHPC内部相对湿度的下降，从而降低UHPC的自收缩，为UHPC提供更好的内养护效果。 Abstract: The influence of porous pumice dosage and pretreatment methods on its water absorption-desorption process was studied using 1H low field nuclear magnetic resonance technology, and the internal curing mechanism of pumice in ultra-high performance concrete(UHPC) was analyzed. The results indicate that the influence of pumice dosage on its water absorption-desorption process is mainly reflected in the characteristic parameters of water migration(water absorption, water release, water absorption rate, water release rate), and indirectly affects the hydration process of UHPC. The influence of different pretreatment methods for pumice on the size and distribution of internal pores in UHPC is mainly concentrated in the early stage of hydration, and has little effect on the later stage of hydration. This phenomenon becomes more pronounced with the increase of pumice dosage. Compared with no pre-wetted pumice, pre-wetted pumice can delay the release time of moisture, which is beneficial for slowing down the decrease in relative humidity inside UHPC, thereby reducing the self-shrinkage of UHPC and providing better internal curing effect for UHPC.

张潇.多孔浮石在超高性能混凝土中的内养护机理[J].混凝土与水泥制品,2025(3):28-33. ZHANG X.Internal curing mechanism of porous pumice in ultra-high performance concrete[J].China Concrete and Cement Products,2025(3):28-33.