產品列表PRODUCTS LIST
混凝土抗彎拉彈性模量試驗裝置試驗結果計算方法:
1、混凝土抗彎拉彈性模量按簡支梁在三分點各加荷載等的跨中撓度公式反算
求得:(T0559-1)
式中:——混凝土抗彎拉彈性模量(MPa);——終荷載及初荷載(N);——對應及的千分表讀數(mm);——試件支座間距離(=450mm);——試件斷面轉動慣量(mm4)。
2、以3個(ge)(ge)(ge)(ge)試(shi)(shi)件(jian)測(ce)(ce)值(zhi)(zhi)(zhi)(zhi)(zhi)的(de)算術(shu)平均(jun)值(zhi)(zhi)(zhi)(zhi)(zhi)為(wei)測(ce)(ce)定值(zhi)(zhi)(zhi)(zhi)(zhi)。3個(ge)(ge)(ge)(ge)試(shi)(shi)件(jian)中(zhong)(zhong)最(zui)大(da)(da)值(zhi)(zhi)(zhi)(zhi)(zhi)或最(zui)小值(zhi)(zhi)(zhi)(zhi)(zhi)中(zhong)(zhong)如(ru)有一個(ge)(ge)(ge)(ge)與中(zhong)(zhong)間(jian)值(zhi)(zhi)(zhi)(zhi)(zhi)之差(cha)超過(guo)中(zhong)(zhong)間(jian)值(zhi)(zhi)(zhi)(zhi)(zhi)的(de)15%,則(ze)(ze)把(ba)最(zui)大(da)(da)值(zhi)(zhi)(zhi)(zhi)(zhi)和最(zui)值(zhi)(zhi)(zhi)(zhi)(zhi)舍去,以中(zhong)(zhong)間(jian)值(zhi)(zhi)(zhi)(zhi)(zhi)作為(wei)試(shi)(shi)件(jian)的(de)抗彎(wan)拉強度。如(ru)有兩(liang)個(ge)(ge)(ge)(ge)測(ce)(ce)值(zhi)(zhi)(zhi)(zhi)(zhi)與中(zhong)(zhong)間(jian)值(zhi)(zhi)(zhi)(zhi)(zhi)的(de)差(cha)值(zhi)(zhi)(zhi)(zhi)(zhi)均(jun)超過(guo)中(zhong)(zhong)間(jian)值(zhi)(zhi)(zhi)(zhi)(zhi)的(de)15%時,則(ze)(ze)該組(zu)試(shi)(shi)驗結(jie)(jie)(jie)果(guo)(guo)無效(xiao)。3個(ge)(ge)(ge)(ge)試(shi)(shi)件(jian)中(zhong)(zhong)如(ru)有一個(ge)(ge)(ge)(ge)斷(duan)(duan)(duan)裂面(mian)(mian)位于加(jia)荷點(dian)外(wai)側,則(ze)(ze)混凝(ning)土抗彎(wan)拉強度按另外(wai)兩(liang)個(ge)(ge)(ge)(ge)試(shi)(shi)件(jian)的(de)試(shi)(shi)驗結(jie)(jie)(jie)果(guo)(guo)計算。如(ru)果(guo)(guo)這(zhe)兩(liang)個(ge)(ge)(ge)(ge)測(ce)(ce)值(zhi)(zhi)(zhi)(zhi)(zhi)的(de)差(cha)值(zhi)(zhi)(zhi)(zhi)(zhi)不大(da)(da)于這(zhe)兩(liang)個(ge)(ge)(ge)(ge)測(ce)(ce)值(zhi)(zhi)(zhi)(zhi)(zhi)中(zhong)(zhong)較(jiao)小值(zhi)(zhi)(zhi)(zhi)(zhi)的(de)15%,則(ze)(ze)以兩(liang)個(ge)(ge)(ge)(ge)測(ce)(ce)值(zhi)(zhi)(zhi)(zhi)(zhi)的(de)平均(jun)值(zhi)(zhi)(zhi)(zhi)(zhi)為(wei)測(ce)(ce)試(shi)(shi)結(jie)(jie)(jie)果(guo)(guo),否(fou)則(ze)(ze)結(jie)(jie)(jie)果(guo)(guo)無效(xiao)。如(ru)果(guo)(guo)有兩(liang)根試(shi)(shi)件(jian)均(jun)出現斷(duan)(duan)(duan)裂面(mian)(mian)位于加(jia)荷點(dian)外(wai)側,則(ze)(ze)該組(zu)結(jie)(jie)(jie)果(guo)(guo)無效(xiao)。注(zhu):斷(duan)(duan)(duan)面(mian)(mian)位置在試(shi)(shi)件(jian)斷(duan)(duan)(duan)塊短邊(bian)一側的(de)底面(mian)(mian)中(zhong)(zhong)軸(zhou)線上量得。結(jie)(jie)(jie)果(guo)(guo)計算精確至1OOMPa。