Preparation and characterization of nano-Fe3O4/paraffin encapsulated isocyanate microcapsule by electromagnetic controlled rupture for self-healing cementitious materials
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Cementitious
Mass fraction
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Cementitious
Slag (welding)
Shrinkage
Basic oxygen steelmaking
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Concrete and cement have been widely used in past decades as a result of urbanization. More and more supplementary cementitious materials are adopted in concrete because its production complements environmental conservation. The influence of slag, fly ash, limestone, etc., on compressive strength of concrete is of interest to engineers worldwide. Many previous studies were specific to certain engineering or certain experiments that could not reveal the nature of the influence of the three supplementary cementitious materials on concrete’s compressive strength. The research concerning the influence of two or more kinds of supplementary cementitious materials on concrete’s compressive strength is still unclear. Moreover, there is a lack of clarity on the optimum proportion of one or more certain cementitious materials in practical engineering or experiments. To overcome these problems, this study adopts the concrete compressive strength development over time (CCSDOT) model, which generates an explicit formula to conduct quantitative research based on extensive data. The CCSDOT model performs well in fitting the compressive strength development of concrete containing cement, slag, fly ash, and limestone flour. The results reveal the nature of the influence of the three supplementary cementitious materials on concrete’s compressive strength through the parameter analysis in the model. Two application cases are analyzed concerning the selection of the three supplementary cementitious materials and design of concrete mix proportion for practical engineering. It is concluded that the CCSDOT model and the method in this study can possibly provide guidance on both the selection of supplementary cementitious materials and the design of optimal concrete mix proportion for practical engineering. Therefore, the study is highly essential and useful.
Cementitious
Slag (welding)
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Ductility (Earth science)
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Alkali–silica reaction
Cementitious
Glass recycling
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Abstract The presence of old cementitious mortar in recycled concrete aggregates (RCA) has been reported to be one of the main factors contributing to a lowering of the performance of concrete made with RCA relative to those made with natural aggregates (NA). This difference in performance has been attributed to the proportion of mortar present in the RCA vis-à-vis the NA used to cast the original parent concrete. Therefore, determining the mortar content might provide an effective means of assessing the overall quality of RCA. Also, as reported in the available literature, it is essential to take into account the amount of mortar present in RCA as part of the total mortar present when designing concrete mixes cast with RCA. However, an easy-to-use standard method for accurately determining the cementitious mortar content of RCA is not available at present. In this study, an acid treatment testing method is proposed to determine the mortar content of RCA. The method is able to remove most, if not all, of the cementitious mortar and takes approximately 24 h to carry out. In addition, the effects of mortar content on properties of RCA including 24-hour water absorption, bulk density, and Los Angeles abrasion resistance were investigated. The effects of the original parent concrete strength on the relationships between mortar content and RCA properties were also investigated. The study was confined to only granitic coarse aggregates.
Cementitious
Abrasion (mechanical)
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To determine the relationship between compressive strength and flexural strength of pavement geopolymer grouting material, 20 groups of geopolymer grouting materials were prepared, the compressive strength and flexural strength were determined by mechanical properties test. On the basis of excluding the abnormal values through boxplot, the results show that, the compressive strength test results were normal, but there were two mild outliers in 7days flexural strength test. The compressive strength and flexural strength were linearly fitted by SPSS, six regression models were obtained by linear fitting of compressive strength and flexural strength. The linear relationship between compressive strength and flexural strength can be better expressed by the cubic curve model, and the correlation coefficient was 0.842.
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Cementitious
Thermocouple
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Abstract A new partially destructive test (PDT) method called local compression test method (LCTM) is proposed to estimate the in situ compressive strength of masonry mortar. In this method, the mortar pieces are taken out from horizontal masonry mortar joints and compressed mutually by means of two flat head round bars, the compressive force crushing the mortar piece is measured. The compressive test for the mortar pieces can be interpreted as the compressive strength test for the radially constrained mortar cylinder. The correction coefficient formula is first established through the tests for the local compressive strength of mortar pieces in the standard thickness (10 mm) and other thickness. The empirical correlation relationships between the local compressive strength of mortar pieces and the compressive strength of mortar cubes are presented for the masonry mortar with compressive strength ranging from M2.5 to M15.0. A good correlation between the cube compressive and local compressive strength has been found. The in situ verification tests are undertaken on a number of mortar structures to determine the accuracy of the LCTM. The experimental and analytical results show that this method is accurate and applicable to in situ tests of the masonry mortar compressive strength.
Compression test
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