【摘要】：現(xiàn)階段，我國建筑施工中用到的砂漿主要是現(xiàn)拌砂漿，其質(zhì)量受施工條件和外界環(huán)境影響很大，若施工中不能有效地控制好砂漿的質(zhì)量，將會(huì)給施工方造成較大的經(jīng)濟(jì)損失。施工過程中如果能快速預(yù)判砂漿的質(zhì)量，從而對(duì)砂漿的質(zhì)量進(jìn)行及時(shí)調(diào)控，對(duì)減少施工方的質(zhì)量風(fēng)險(xiǎn)將有重大的意義。本文針對(duì)砂漿質(zhì)量控制問題，以建筑中常用的水泥砂漿和混合砂漿（水泥石灰砂漿）為對(duì)象，研究了快速預(yù)測(cè)砂漿強(qiáng)度的方法，主要研究內(nèi)容和結(jié)論如下： （1）借鑒混凝土強(qiáng)度快速預(yù)測(cè)方法，設(shè)計(jì)了適合砂漿強(qiáng)度快速預(yù)測(cè)的試驗(yàn)方法——帶模促凝蒸養(yǎng)法，即在量產(chǎn)砂漿樣品中加入促凝劑CS，攪拌均勻后，制成砂漿試件（40mm×40mm×50mm）并帶模進(jìn)行高溫蒸汽養(yǎng)護(hù)，根據(jù)加速養(yǎng)護(hù)的早期強(qiáng)度預(yù)測(cè)標(biāo)準(zhǔn)養(yǎng)護(hù)28d強(qiáng)度，并給出了“砂漿加速蒸養(yǎng)法企業(yè)標(biāo)準(zhǔn)”。 （2）分別對(duì)常用強(qiáng)度等級(jí)（M5、M7.5、M10）的水泥砂漿和混合砂漿進(jìn)行了配合比設(shè)計(jì)、試件設(shè)計(jì)、加速養(yǎng)護(hù)試驗(yàn)和標(biāo)準(zhǔn)養(yǎng)護(hù)試驗(yàn)，獲得了60組1080個(gè)試件的強(qiáng)度測(cè)試數(shù)據(jù)。 （3）研究了加速養(yǎng)護(hù)砂漿早期強(qiáng)度與標(biāo)準(zhǔn)養(yǎng)護(hù)28d砂漿強(qiáng)度的相關(guān)關(guān)系，分別建立了一元、二元、三元線性數(shù)學(xué)模型，并運(yùn)用MATLAB軟件進(jìn)行數(shù)值回歸，分析得到相應(yīng)的強(qiáng)度預(yù)測(cè)公式。一元線性回歸模型只需用3.5h（或4.5h）加速養(yǎng)護(hù)砂漿強(qiáng)度一個(gè)變量，能夠方便快速地預(yù)測(cè)常用砂漿強(qiáng)度；二元線性模型需用3.5h和4.5h加速養(yǎng)護(hù)砂漿強(qiáng)度兩個(gè)變量，能夠得到更加精確的預(yù)測(cè)結(jié)果；三元線性模型需要用到砂漿配合比（砂與水泥的質(zhì)量比）S/C及3.5h、4.5h加速養(yǎng)護(hù)砂漿強(qiáng)度三個(gè)變量，可以用于不同強(qiáng)度等級(jí)，不同類型的砂漿強(qiáng)度的預(yù)測(cè)，，適用范圍更加廣泛。 （4）研究了人工神經(jīng)網(wǎng)絡(luò)在預(yù)測(cè)砂漿強(qiáng)度中的應(yīng)用，運(yùn)用MATLAB軟件建立了預(yù)測(cè)水泥砂漿和混合砂漿強(qiáng)度的BP神經(jīng)網(wǎng)絡(luò)模型，并對(duì)模型精度進(jìn)行了測(cè)試，與傳統(tǒng)回歸模型相比，其試驗(yàn)結(jié)果穩(wěn)定可靠。 （5）獲得了水泥砂漿和混合砂漿（水泥石灰砂漿）在蒸養(yǎng)養(yǎng)護(hù)條件下的強(qiáng)度發(fā)展規(guī)律。在加速養(yǎng)護(hù)條件下，砂漿試塊的強(qiáng)度值和強(qiáng)度比（加速養(yǎng)護(hù)強(qiáng)度與標(biāo)準(zhǔn)養(yǎng)護(hù)28d強(qiáng)度之比）隨著養(yǎng)護(hù)時(shí)間的增加總體上呈增大的趨勢(shì)；隨著水泥用量的增大，參與凝結(jié)硬化反應(yīng)水泥的絕對(duì)量值增加，相對(duì)量值也增加，但增幅較��；在養(yǎng)護(hù)時(shí)間較大時(shí)（3.5h和4.5h），強(qiáng)度測(cè)試值往往表現(xiàn)出較好的相關(guān)性和較小的離散性，因此采用較大養(yǎng)護(hù)時(shí)間的強(qiáng)度測(cè)試值對(duì)28d標(biāo)養(yǎng)強(qiáng)度進(jìn)行預(yù)測(cè)，可以提高預(yù)測(cè)精度。
[Abstract]:At present, the mortar used in the construction of our country is mainly mixed mortar, the quality of which is greatly affected by the construction conditions and the external environment. If the quality of the mortar can not be effectively controlled in construction, it will cause great economic losses to the construction side. It will be of great significance to reduce the quality risk of construction if the quality of mortar can be predicted quickly and the quality of mortar can be adjusted in time. In this paper, aiming at the quality control of mortar, taking cement mortar and mixed mortar (cement lime mortar), which are commonly used in building, as the object, the method of rapid prediction of mortar strength is studied. The main research contents and conclusions are as follows: (1) based on the rapid prediction method of concrete strength, a suitable test method for rapid prediction of mortar strength is designed, I. e., adding coagulant CS, to the mass produced mortar sample. After mixing evenly, the mortar specimen (40mm 脳 40mm 脳 50mm) was made into high temperature steam curing with mould. According to the early strength of accelerated curing, the curing strength of 28 days was predicted, and the enterprise standard of accelerated steam curing of mortar was given. (2) the mixture ratio design of cement mortar and mixed mortar of common strength grade (M5 / M7.5M10) was carried out, the specimen design, accelerated curing test and standard maintenance test were carried out, and the strength test data of 60 groups of 1080 specimens were obtained. (3) the relationship between the early strength of accelerated curing mortar and the strength of standard curing mortar for 28 days is studied. The linear mathematical models of monolithic, binary and ternary are established, and the numerical regression is carried out by using MATLAB software. The corresponding strength prediction formula is obtained by analysis. The univariate linear regression model only needs 3.5h (or 4.5h) to accelerate the curing strength of mortar, which can be used to predict the strength of commonly used mortar conveniently and quickly. The binary linear model needs two variables of 3.5 h and 4.5 h to accelerate curing mortar strength, which can get more accurate prediction results. In the ternary linear model, three variables, S / C (mass ratio of sand to cement) and 3.5 h / 4.5h accelerated curing mortar strength, can be used to predict the strength of mortar of different strength grades and types. The scope of application is wider. (4) the application of artificial neural network in predicting mortar strength is studied. The BP neural network model for predicting the strength of cement mortar and mixed mortar is established by using MATLAB software. The precision of the model is tested and compared with the traditional regression model. The test results are stable and reliable. (5) the strength development law of cement mortar and mixed mortar (cement lime mortar) under steam curing condition was obtained. Under the condition of accelerated curing, the strength value and strength ratio (the ratio of accelerated curing strength to standard curing strength of 28 days) showed an increasing trend with the increase of curing time. With the increase of cement content, the absolute value of cement involved in the condensation hardening reaction increased, and the relative value also increased, but the increase was relatively small. When the curing time is longer (3.5h and 4.5h), the strength test value often shows better correlation and less dispersion. Therefore, the 28d standard strength is predicted by the strength test value of the larger curing time. The prediction accuracy can be improved.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU578.1

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