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1、核準(zhǔn)通過(guò),歸檔資料。未經(jīng)允許,請(qǐng)勿外傳!摘 要水泥混凝土廣泛應(yīng)用于基礎(chǔ)建設(shè)各個(gè)領(lǐng)域,隨著經(jīng)濟(jì)發(fā)展、科技進(jìn)步,人們對(duì)其使用品質(zhì)要求越來(lái)越高?,F(xiàn)行混凝土配合比設(shè)計(jì)方法設(shè)計(jì)的混凝土以懸浮密實(shí)型結(jié)構(gòu)為主,易在集料與水泥石粘結(jié)處發(fā)生破壞,且尚未充分發(fā)揮粗集料的作用。為此,本研究在體積法的基礎(chǔ)上,提出了粗集料緊密堆積結(jié)構(gòu)與緊密堆積型水泥混凝土概念,并對(duì)其工作性、強(qiáng)度特性及其設(shè)計(jì)方法開(kāi)展了系統(tǒng)研究,以期節(jié)約成本,提高混凝土性能,具有重要工程實(shí)用價(jià)值。
2、粗集料緊密堆積結(jié)構(gòu)是指骨架顆粒與填充顆粒之間充分嵌鎖、緊密排列、不干涉或少干涉,使其達(dá)到合理密實(shí)狀態(tài)時(shí)形成一個(gè)多級(jí)空間骨架結(jié)構(gòu);在此基礎(chǔ)上,利用砂填充粗集料振實(shí)剩余空隙,粉煤灰作為填充砂振實(shí)剩余空隙,再用水泥凈漿潤(rùn)滑和填充混合料的剩余空隙,形成緊密堆積型水泥混凝土。綜合研究成果,提出了緊密堆積型混凝土配合比設(shè)計(jì)方法,并與現(xiàn)行設(shè)計(jì)方法對(duì)比表明,同等強(qiáng)度、工作性要求下,緊密堆積型水泥混凝土比現(xiàn)行設(shè)計(jì)方法確定的混凝土的經(jīng)濟(jì)性更好,且設(shè)計(jì)方法可
3、操作性強(qiáng),簡(jiǎn)便實(shí)用,可以直接應(yīng)用于工程實(shí)際。關(guān)鍵詞:水泥混凝土,工作性,強(qiáng)度特性,配合比設(shè)計(jì)方法9JWKffwvG#tYM*Jg&6a*CZ7H$dq8KqqfHVZFedswSyXTy#&QA9wkxFyeQ^!djs#XuyUP2kNXpRWXmA&UE9aQ@Gn8xp$R#͑Gx^Gjqv^$UE9wEwZ#Qc@UE%&qYp@Eh5pDx2zVkum&gTXRm6X4N
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