混凝土
混凝土
혼응토
CONCRETE
2015年
5期
50-54
,共5页
张磊%邵正明%曾银枝%黄莹
張磊%邵正明%曾銀枝%黃瑩
장뢰%소정명%증은지%황형
加固灌浆料%力学性能%尺寸效应%换算系数
加固灌漿料%力學性能%呎吋效應%換算繫數
가고관장료%역학성능%척촌효응%환산계수
cement - based grouts used for reinforcement%mechanical property%size effect%conversion coefficient
力学性能尺寸效应是水泥基材料的一种自然现象。采用市售的三种加固灌浆料，分别测定端面尺寸为100 mm ×100 mm和150 mm ×150 mm 两种尺寸试件的立方体抗压强度、劈裂抗拉强度、棱柱体抗压强度、抗折强度和静压受力弹性模量，各试件成型数量在30组以上，试验得出三种加固灌浆料的立方体抗压强度尺寸效应换算系数范围为0．81~0．87，平均值为0．84；劈裂抗拉强度换算系数范围为0．77~0．87，平均值为0．82；轴心抗压强度换算系数范围为1．0~1．03，平均为1．0；抗折强度换算系数范围0．82~0．88，平均为0．86；静压受力弹性模量尺寸效应系数范围为0．89~0．96，平均为0．92。抗压强度随着强度提高，换算系数降低，而弹性模量的规律相反。分析表明，与混凝土相比，加固灌浆料 C-S-H 凝胶体积含量高、骨料小、水胶比低是造成尺寸效应显著的原因。
力學性能呎吋效應是水泥基材料的一種自然現象。採用市售的三種加固灌漿料，分彆測定耑麵呎吋為100 mm ×100 mm和150 mm ×150 mm 兩種呎吋試件的立方體抗壓彊度、劈裂抗拉彊度、稜柱體抗壓彊度、抗摺彊度和靜壓受力彈性模量，各試件成型數量在30組以上，試驗得齣三種加固灌漿料的立方體抗壓彊度呎吋效應換算繫數範圍為0．81~0．87，平均值為0．84；劈裂抗拉彊度換算繫數範圍為0．77~0．87，平均值為0．82；軸心抗壓彊度換算繫數範圍為1．0~1．03，平均為1．0；抗摺彊度換算繫數範圍0．82~0．88，平均為0．86；靜壓受力彈性模量呎吋效應繫數範圍為0．89~0．96，平均為0．92。抗壓彊度隨著彊度提高，換算繫數降低，而彈性模量的規律相反。分析錶明，與混凝土相比，加固灌漿料 C-S-H 凝膠體積含量高、骨料小、水膠比低是造成呎吋效應顯著的原因。
역학성능척촌효응시수니기재료적일충자연현상。채용시수적삼충가고관장료，분별측정단면척촌위100 mm ×100 mm화150 mm ×150 mm 량충척촌시건적립방체항압강도、벽렬항랍강도、릉주체항압강도、항절강도화정압수력탄성모량，각시건성형수량재30조이상，시험득출삼충가고관장료적립방체항압강도척촌효응환산계수범위위0．81~0．87，평균치위0．84；벽렬항랍강도환산계수범위위0．77~0．87，평균치위0．82；축심항압강도환산계수범위위1．0~1．03，평균위1．0；항절강도환산계수범위0．82~0．88，평균위0．86；정압수력탄성모량척촌효응계수범위위0．89~0．96，평균위0．92。항압강도수착강도제고，환산계수강저，이탄성모량적규률상반。분석표명，여혼응토상비，가고관장료 C-S-H 응효체적함량고、골료소、수효비저시조성척촌효응현저적원인。
Size effect of mechanical properties is universal phenomena of cement - based materials.By using 3 cement - based grouts for reinforcement bought in market,and face sizes 100 mm × 100 mm and 150 mm × 150 mm specimen were adopted,their mechanical properties such as cubic compressive strength,splitting tensile strength,prism compressive strength,flexural strength and static compres-sive elastic modulus were tested,which each property was tested more than 30 times.The following conclusions were reached the con-version coefficient of cubic compressive strength for 3 grouts is 0.81~0.87,average value is 0.84,lower than that of high strength con-crete;the conversion coefficient of splitting tensile strength is 0.77~0.87,average value is 0.82;the conversion coefficient of prism com-pressive strength is 1.0~1.03,average value is 1.0;the conversion coefficient of flexural strength is 0.82~0.88,average value is 0.86;the conversion coefficient of static compressive elastic modulus is 0.89~0.96,average value is 0.92.With compressive strength rises,conver-sion coefficient reduces,but elastic modulus is contrary.Compared with concrete,cement - based grout has less C-S-H gel volume,smal-ler aggregate,lower water - binder ratio,and these are properly reasons which cause significant size effect.
