Method for adjusting the hardening speed of cement, and cement hardening speed adjusting agent set.

Abstract

This invention provides a method for adjusting the hardening speed of cement, which uses calcium silicate-based materials such as waste as a raw material and can be adjusted to a desired hardening speed, as well as a cement hardening speed adjusting agent set. [Solution] A method for adjusting the hardening speed of cement and a cement hardening speed adjusting agent set, comprising a hardening speed adjusting agent preparation step which includes a wet grinding operation to obtain a slurry by wet grinding a calcium silicate-based material, and an addition step which includes adding the hardening speed adjusting agent to a cement composition, wherein the hardening speed of the cement composition is adjusted by controlling the operating conditions and / or operating procedure in the hardening speed adjusting agent preparation step.

Description

Technical Field

[0001] The present invention relates to a method for adjusting the setting rate of cement and a cement setting rate adjusting agent set.

Background Art

[0002] In recent years, from the viewpoint of environmental conservation, reduction of industrial waste has been strongly desired. The treatment of waste materials generated in large quantities from construction sites and their demolition sites, especially waste materials of calcium silicate-based materials such as ALC (lightweight cellular concrete) and calcium silicate boards widely used as building materials, has become an important issue.

[0003] For calcium silicate-based materials, few effective recycling methods have been found. Although a small part of them is crushed and recycled as landfill materials for roadbed materials, most of them are disposed of as industrial waste. Since the capacity of industrial waste treatment plants has been strained in recent years, reduction of waste calcium silicate-based materials from demolished buildings and the like has been strongly desired.

[0004] As a method for recycling calcium silicate-based waste, Patent Document 1 discloses that calcium silicate-based waste is finely pulverized by wet mechanochemical treatment, and part or all of the calcium silicate-based minerals are amorphized and used as a cement setting accelerator.

[0005] By the way, the setting rate of cement is not always required to be fast. For example, there are situations where it is desired to appropriately adjust the time until setting, such as when there is time until the operations of forming and placing.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] Therefore, the present invention aims to provide a method for adjusting the hardening speed of cement, which can be adjusted to a desired hardening speed using calcium silicate-based materials such as waste as raw materials, and a cement hardening speed adjusting agent set. [Means for solving the problem]

[0008] The above objective is achieved by the present invention as described below. That is, the embodiments of the present invention are as follows.

[0009] <1> A curing rate modifier preparation step, which includes a wet grinding operation to obtain a slurry by wet grinding a calcium silicate-based material, An addition step of adding the hardening rate modifier to the cement composition, Includes, A method for adjusting the hardening speed of cement, comprising controlling the operating conditions and / or operating procedure in the hardening speed adjusting agent preparation step to adjust the hardening speed of the cement composition.

[0010] <2> The operating conditions controlled in the curing rate adjustment agent preparation step are the grinding conditions for the wet grinding operation. <1> A method for adjusting the hardening speed of cement as described above.

[0011] <3> The grinding conditions are controlled by selecting the water ratio (water / calcium silicate-based material) (by mass). <2> A method for adjusting the hardening speed of cement as described above.

[0012] <4> The curing rate adjusting agent preparation step includes a filtration operation in which the slurry is filtered following the wet grinding operation. <1> A method for adjusting the hardening speed of cement as described above.

[0013] <5> The operation procedure controlled in the curing rate adjusting agent preparation step is the filtration procedure. The operation procedure is controlled by selecting one from the group consisting of the filtrate obtained by the filtration operation, the filtrate residue, the slurry before the filtration operation, and a mixed solution obtained by selecting two of these and mixing them, and, if the mixed solution is selected, further selecting the mixing ratio. <4> A method for adjusting the hardening speed of cement as described above.

[0014] <6> The aforementioned calcium silicate material is calcium silicate waste material. <1> A method for adjusting the hardening speed of cement as described above.

[0015] <7> The calcium silicate material is at least one waste material selected from the group consisting of ALC panels, calcium silicate boards, and siding boards. <1> A method for adjusting the hardening speed of cement as described above.

[0016] <8> A first curing rate modifier, which is a slurry obtained by wet grinding of a calcium silicate-based material, A second curing rate modifier, which is a filtrate obtained by a filtration operation to filter the slurry, The third curing rate modifier is the residue obtained by the above filtration operation, A cement hardening speed modifier set consisting of at least three types of hardening speed modifiers.

[0017] <9> Furthermore, the curing rate regulator comprises at least four types of curing rate regulators, including a fourth curing rate regulator which is a mixture obtained by selecting and mixing two from the group consisting of the slurry, the filtrate, and the filtrate. <8> A cement hardening speed adjuster set as described.

[0018] <10> It consists solely of a curing rate modifier, which is a slurry obtained by wet grinding of calcium silicate-based materials. A cement setting retarder set comprising n1 (n1 is an integer of 2 or more) types of setting retarders, namely, a 1-1st setting retarder to a 1-n1st setting retarder, which are n1 types of slurries under n1 conditions where the water ratio (water / calcium silicate-based material) (mass basis) during the wet grinding is different.

[0019] <11> The 1st setting retarder contains n1 types of the slurries, namely, a 1-1st setting retarder to a 1-n1st setting retarder, under n1 conditions where the water ratio (water / calcium silicate-based material) (mass basis) during the wet grinding is different, and is a cement setting retarder set according to <8>, which consists of a total of (2 + n1) types of setting retarders.

[0020] <12> It consists only of a setting retarder which is a mixed liquid obtained by selecting and mixing 2 from the group consisting of a slurry obtained by wet grinding a calcium silicate-based material, a filtrate obtained by a filtration operation of filtering the slurry, and a filter cake obtained by the filtration operation. A cement setting retarder set comprising n2 (n2 is an integer of 2 or more) types of mixed liquids, namely, a 4-1st setting retarder to a 4-n2nd setting retarder, which are n2 types of mixed liquids under n2 conditions where the combination of selecting and mixing 2 from the group consisting of the slurry, the filtrate, and the filter cake, and / or their mixing ratios are different.

[0021] <13> The 4th setting retarder contains n2 types of mixed liquids, namely, a 4-1st setting retarder to a 4-n2nd setting retarder, under n2 conditions where the combination of selecting and mixing 2 from the group consisting of the slurry, the filtrate, and the filter cake, and / or their mixing ratios are different, and is a cement setting retarder set according to <9>, which consists of a total of (3 + n2) types of setting retarders.

[0022] <14> The first curing rate modifier includes n1 types of slurry, n1 of which are defined by different conditions (n1 is an integer of 2 or more) for the water ratio (water / calcium silicate-based material) (by mass) during wet grinding, and the first curing rate modifier comprises the first-n1 curing rate modifiers. The fourth curing rate regulator includes n2 types of mixed liquids, namely the 4-1 to 4-n2 curing rate regulators, which are two combinations of selecting and mixing from the group consisting of the slurry, the filtrate, and the filtrate, and / or n2 (where n2 is an integer of 2 or more) different mixing ratios, for a total of (2 + n1 + n2) types of curing rate regulators. <9> A cement hardening speed adjuster set as described. [Effects of the Invention]

[0023] According to the present invention, it is possible to provide a method for adjusting the hardening speed of cement, which can be adjusted to a desired hardening speed using calcium silicate-based materials such as waste as raw materials, and a cement hardening speed adjusting agent set. [Brief explanation of the drawing]

[0024] [Figure 1] This graph shows the results of the curing speed adjustment test 1, with the water ratio plotted on the horizontal axis and the load (N) on the vertical axis. [Figure 2] This bar graph shows the results of the curing speed adjustment test 2, with the added curing speed adjuster on the horizontal axis and the load (N) on the vertical axis. [Modes for carrying out the invention]

[0025] The embodiments of the present invention will be described in detail below, divided into a method for adjusting the hardening speed of cement and a set of cement hardening speed adjusting agents.

[0026] [Method for adjusting the hardening speed of cement] The method for adjusting the hardening rate of cement according to this embodiment (hereinafter sometimes simply referred to as the "hardening rate adjustment method") includes a hardening rate adjusting agent preparation step and an addition step.

[0027] <Preparation process for curing speed modifier> In the curing rate adjustment method according to this embodiment, the curing rate adjustment agent preparation step is a step of preparing a curing rate adjustment agent that includes a wet grinding operation to obtain a slurry by wet grinding a calcium silicate-based material. In the curing rate adjustment agent preparation step, if necessary, a filtration operation is performed to filter the obtained slurry following the wet grinding operation. If the calcium silicate-based material used is large in area or in large lumps, a coarse grinding operation may be performed prior to the wet grinding operation described above.

[0028] (Coarse grinding operation) Coarse grinding is a process of coarse grinding prior to wet grinding by powerful grinding such as dry grinding (roller mill, etc.). The conditions for coarse grinding are preferably stronger than those for wet grinding, and there are no particular restrictions on the grinding method, grinding equipment, or grinding conditions. Of course, in the hardening rate regulator preparation process, it is also acceptable to proceed directly to wet grinding without coarse grinding.

[0029] (Wet grinding operation) In this embodiment, the wet grinding operation performed in the hardening rate regulator preparation step uses a calcium silicate-based material as the raw material, which is then wet-ground. The calcium silicate material to be wet-milled in the wet-milling operation may be calcium silicate waste material, or calcium silicate minerals used as a resource or contained in calcium silicate waste material. In light of the purpose of effectively utilizing waste, it is preferable to use calcium silicate waste material as the raw material.

[0030] Calcium silicate waste materials include, for example, ALC panels, calcium silicate boards (also called "calcium silicate boards"), or siding boards, which are generated from construction or demolition sites of buildings. In other words, it is preferable that the calcium silicate material used as a raw material be at least one of the waste materials selected from the group consisting of ALC panels, calcium silicate boards, and siding boards.

[0031] The calcium silicate minerals contained in these calcium silicate waste materials include crystalline minerals such as tobermorite and xonotlite, as well as low-crystalline or amorphous minerals of the CaO-SiO2-H2O system (generally referred to as CSH).

[0032] Calcium silicate-based materials may contain calcium carbonate, calcium sulfate, calcium hydroxide, aluminum hydroxide, etc., in addition to calcium silicate. They may also contain other impurities, such as organic fibers like pulp and plant roots, inorganic fibers like wollastonite, rebar scraps, and iron powder.

[0033] In this embodiment, materials containing 50% or more calcium silicate by mass are referred to as "calcium silicate-based materials" and are used. The calcium silicate content in the calcium silicate-based material is preferably 60% or more by mass, more preferably 70% or more, and even more preferably 80% or more.

[0034] In this embodiment, the wet grinding operation performed in the curing rate regulator preparation process is a relatively gentle grinding operation. Wet grinding is advantageous because it allows for larger equipment and reduces running costs (power consumption and grinding media consumption), thus achieving low costs. Furthermore, wet grinding is advantageous because it can suppress noise compared to dry grinding.

[0035] In this embodiment, a suitable wet grinding process involves placing the calcium silicate material to be ground and the grinding media into water, and grinding under relatively gentle rotational conditions using, for example, a rolling mill as the grinder. In addition to rolling mills, other grinders such as bench mills, pot mills, tube mills, conical mills, vibratory mills, centrifugal mills, planetary mills, tower mills, agitated tank mills, and colloidal mills can be used.

[0036] For the grinding media, any common material can be used, such as iron balls, alumina balls, zirconia balls, silicon carbide balls, or stainless steel balls. The diameter of the grinding media can be appropriately selected from a range of approximately 0.5 mmφ to 100 mmφ. The amount of grinding media to be added should be about 10 to 30% of the container capacity.

[0037] (filtration operation) In this embodiment, following the wet grinding operation, a filtration operation is performed to filter the obtained slurry as needed. Specific methods of filtration include, for example, suction filtration using a filter medium. When using a filter medium, general filter paper, filter cloth, or various other filter materials can be used. However, the filtration operation is not limited to the above method, and other filtration methods such as natural filtration, pressure filtration, and centrifugal filtration can also be applied.

[0038] The filtration operation yields a filtrate and a residue. The residue is dried into a dry powder by methods such as air drying, hot air drying, heating drying, or standing at room temperature (unless otherwise specified, "residue" refers to this dried powder). The filtration operation procedure, described later as a "controlled operation procedure," includes procedures for collecting the filtrate and the residue separately, and procedures for selecting and mixing two of the three substances, including the collected filtrate and residue, and the slurry before the filtration operation.

[0039] In the hardening rate adjusting agent preparation process, which includes the wet grinding operation described above and sometimes further includes coarse grinding and filtration operations, the operating conditions and / or operating procedures are controlled to adjust the hardening rate of the cement composition. The operating conditions and operating procedures referred to here will be described in detail later in the section "Methods for Controlling Operating Conditions and Operating Procedures".

[0040] <Addition process> In the hardening rate adjustment method according to this embodiment, the addition step is the step of adding a hardening rate adjuster to the cement composition. In the addition step, it is desirable to thoroughly stir the mixture after adding the hardening rate adjuster to homogenize the cement composition.

[0041] Here, "cement composition" refers to a composition containing at least cement and water, and includes not only cement paste but also concrete and mortar mixed with coarse aggregate and fine aggregate as appropriate. Colorants and various additives may be mixed into the "cement composition" as needed.

[0042] In this embodiment, there are no particular limitations on the cement whose hardening speed can be adjusted. Examples include Portland cements such as ordinary Portland cement, rapid-hardening Portland cement, ultra-rapid-hardening Portland cement, and moderate-heat Portland cement, as well as white cement, jet cement, blast furnace cement, fly ash cement, and alumina cement.

[0043] The hardening rate of a cement composition to which a hardening rate modifier has been added is adjusted according to the control settings used during the preparation of the hardening rate modifier. The mixing ratio of the hardening rate modifier should preferably be above a ratio that can affect the hardening rate of the cement, and within a range where the mixing has no effect on the consistency of the cement composition or the performance of the hardened product after hardening, or at least below an upper limit where the effect is negligible. Since this depends on the composition and properties of the hardening rate modifier (liquid, slurry, or powder), a specific preferred mixing ratio cannot be stated in general. As a guideline, the total amount of solids contained in the hardening rate modifier should be selected from a range of 0.1% to 20% by mass relative to the total amount of cement in the cement composition, and preferably within a range of 1% to 10% by mass.

[0044] <Control method for operating conditions and operating procedures> In the hardening speed adjustment method according to this embodiment, the hardening speed of the cement composition is adjusted by controlling the operating conditions and / or operating procedure in the hardening speed adjustment agent preparation process. More details are as follows.

[0045] (Control of operating conditions) One way to control the operating conditions for adjusting the hardening rate of cement compositions is to control the grinding conditions in the wet grinding operation. Specifically, this includes the selection of the grinder used, the grinder's rotation speed, the grinding time, the type and diameter of the grinding media, and the water ratio (water / calcium silicate material) (by mass). Reasons why these factors affect the hardening rate include, for example, the possibility of contamination of the filtrate with media components depending on the material of the grinding media, which can affect the hardening rate. Also, if the water ratio is different, the amount of ions derived from the calcium silicate material dissolved in the filtrate will differ, which may affect the chemical reaction rate of the cement.

[0046] Among these, by controlling the grinding conditions by selecting the water ratio (water / calcium silicate-based material) (by mass), it is expected that the hardening rate of the cement composition can be precisely and broadly adjusted to the desired hardening rate. Specifically, when the water ratio is in the range of 1.2 to 9.0, preferably in the range of 1.3 to 8.5, and more preferably in the range of 1.4 to 8.0, the hardening rate of the cement composition can be made extremely fast. The hardening rate peaks at a water ratio of 1.5, and decreases sharply below that point and gradually above it.

[0047] Therefore, by selecting a water ratio from a wide range, including a range from less than 1.2 to more than 9.0, the hardening speed of the cement composition can be broadly adjusted. The fact that the hardening speed of the cement composition can be broadly adjusted by selecting the water ratio is verified in the examples described later.

[0048] (Control of operating procedures) One way to control the operating procedure for adjusting the hardening rate of a cement composition is to perform a filtration operation in which the slurry is filtered following a wet grinding operation. More specifically, the operating procedure can be controlled by selecting one from the group consisting of (a) filtrate obtained by the filtration operation, (b) filtrate remaining on the filter material, (c) slurry before the filtration operation, and (d) mixed liquid obtained by selecting and mixing two of these. If (d) mixed liquid is selected, the operating procedure can be further controlled by selecting the mixing ratio.

[0049] Of (a) the filtrate, (b) the residue, and (c) the slurry, (c) the slurry is most effective in accelerating the hardening rate of the cement composition, followed by (b) the residue. While the latter is slightly inferior, both are excellent in accelerating the hardening rate. In contrast, (a) the filtrate is considerably less effective in accelerating the hardening rate of the cement composition, although the accelerating effect itself is still observed. Therefore, by selecting one of these as a hardening rate modifier and adding it in the addition process, the desired hardening rate can be achieved.

[0050] Furthermore, considering the differences in the hardening rate-accelerating effects of (a) filtrate, (b) slag, and (c) slurry on the cement composition, a (d) mixture obtained by selecting and mixing two of these three can be selected as a hardening rate regulator. When selecting this (d) mixture, the mixing ratio can also be selected. By appropriately selecting the mixing ratio, the hardening rate can be adjusted steplessly. For example, since the hardening acceleration effect tends to be stronger the more (b) slag is present, if high hardening acceleration is to be aimed at, only (b) slag can be used, and by mixing (a) filtrate with (b) slag, the hardening rate can be adjusted steplessly to an appropriate level by controlling the proportion of (a) filtrate.

[0051] The fact that the hardening rate of the cement composition can be adjusted by controlling the operating procedure by selecting one from the group consisting of (a) filtrate, (b) filtrate residue, (c) slurry, and (d) mixed liquid, and by further selecting the mixing ratio if (d) mixed liquid is selected, is verified in the examples described later.

[0052] [Cement hardening speed adjustment agent set] As described above, according to the cement hardening speed adjustment method of this embodiment, the hardening speed can be adjusted by adding a hardening speed adjuster, which has been subjected to predetermined control during preparation, to the cement composition. Alternatively, by preparing a "cement hardening speed adjuster set" containing multiple hardening speed adjusters and selecting one of them, the hardening speed of the cement composition can be adjusted to a desired degree.

[0053] Examples of cement hardening speed regulator sets (hereinafter sometimes simply referred to as "hardening speed regulator sets" or "sets") include the following combinations:

[0054] (A) A set of three curing speed adjusters controlled solely by the filtration procedure. As for a set of hardening rate regulators, first, we can mention a set consisting of at least the following three types of hardening rate regulators. The lowercase letters in parentheses (a) to (c) are the codes assigned to each substance as explained in the section (control of operating procedures) in "Method for adjusting the hardening rate of cement" (the same applies to (d) in the following set (B)).

[0055] (1) A first curing rate modifier which is a slurry obtained by wet grinding of a calcium silicate-based material (c) (2)(c) The filtrate obtained by filtering the slurry is (a) the second curing rate modifier. (3) (b) Third curing rate modifier, which is the residue obtained by the filtration operation in (2)

[0056] (B)(A) set with an additional curing speed adjuster added. Regarding set (A), a set comprising at least four types of curing rate modifiers can be given, which includes a fourth curing rate modifier, which is a mixed liquid (d) obtained by selecting and mixing two from the group consisting of (1)(c) slurry, (2)(a) filtrate, and (3)(b) filtrate.

[0057] (C) A set of n1 (n1 is an integer greater than or equal to 2) types of curing speed adjusters controlled solely by the water ratio. A curing speed regulator set can also be obtained simply by controlling the water ratio (water / calcium silicate-based material) (by mass) during the preparation of the curing speed regulator. In this case, the so-called n number of water ratios is n1, and the resulting set will be a set of n1 types of curing speed regulators.

[0058] A set of curing rate modifiers by controlling the filtration procedure of (D)(A), wherein the first curing rate modifier, (c) slurry, is further modified to have n1 (n1 is an integer of 2 or more) types of curing rate modifiers by controlling the water ratio in the same way as in (C). The set of curing rate regulators obtained by controlling the filtration procedure in (A) consists of at least three types of curing rate regulators. However, for the (c) slurry of the first curing rate regulator, one of these three types, a wider variety of sets can be obtained by controlling the water ratio (water / calcium silicate-based material) (by mass) during the preparation of the curing rate regulator. In this case, the so-called n number of the water ratio is n1, and the (c) slurry consists of n1 types of curing rate regulators (1st-1 curing rate regulator, 1st-2 curing rate regulator... 1st-n1 curing rate regulator), resulting in a total of (3+n1) types of curing rate regulators.

[0059] A set of n2 (where n2 is an integer greater than or equal to 2) curing rate modifiers consisting of (d) a mixture obtained by selecting and mixing two from the group consisting of (E)(c) slurry, (a) filtrate, and (b) filtrate. A curing speed regulator set can also be obtained by simply controlling the combinations and mixing ratios of (c) slurry, (a) filtrate, and (b) filtrate when mixing them. In this case, the so-called n number of mixing patterns (all patterns with different combinations and mixing ratios) is n2, and the resulting set will be a set of n2 types of curing speed regulators.

[0060] A set of curing rate modifiers controlled by the filtration procedure of (F)(B), wherein the fourth curing rate modifier, (d), is further configured to have n2 (n2 is an integer greater than or equal to 2) types of curing rate modifiers controlled by the same mixing pattern as in (E). The set of curing rate regulators controlled by the filtration procedure in (B) consists of at least four types of curing rate regulators. However, for the (d) mixture of the fourth curing rate regulator, a more diverse set can be obtained by controlling the combination of selecting two from (c) slurry, (a) filtrate, and (b) sludge, and by controlling their mixing ratio. In this case, the so-called n number of mixing patterns is n2, and the (d) mixture consists of n2 types of curing rate regulators (4-1 curing rate regulator, 4-2 curing rate regulator...4-n2 curing rate regulator), resulting in a total of (3+n2) types of curing rate regulators.

[0061] A set of curing rate regulators controlled by the filtration procedure of (G)(B), wherein the first curing rate regulator (c) slurry is further configured with n1 types of curing rate regulators (n1 is an integer of 2 or more) by controlling the water ratio in the same way as in (C), and the fourth curing rate regulator (d) mixture is further configured with n2 types of curing rate regulators (n2 is an integer of 2 or more) by controlling the mixing ratio in the same way as in (E).

[0062] The set of curing rate regulators controlled by the filtration procedure in (B) consists of at least four types of curing rate regulators. However, for (c) slurry, which is one of the first curing rate regulators, the water ratio (water / calcium silicate-based material) (by mass) during the preparation of the curing rate regulator is controlled. Furthermore, for (d) mixed liquid, which is another of the fourth curing rate regulators, a wider variety of sets can be obtained by controlling the combination of selecting two from (c) slurry, (a) filtrate, and (b) slag, as well as their mixing ratio. In this case, the so-called n number of water ratios is n1, and (c) slurry becomes n1 types of curing rate regulators in n numbers (1st-1 curing rate regulator, 1st-2 curing rate regulator... 1st-n1 curing rate regulator). Also, the so-called n number of mixing patterns is n2, and (d) mixed liquid becomes n2 types of curing rate regulators in n numbers (4th-1 curing rate regulator, 4th-2 curing rate regulator... 4th-n2 curing rate regulator). Therefore, in case (F), the set consists of a total of (2 + n1 + n2) types of curing rate modifiers. [Examples]

[0063] Next, the present invention will be described more specifically with reference to examples, but the present invention is not limited to the following examples.

[0064] [Curing speed adjustment test 1] (Preparation process for curing speed modifier) In a 300ml poly bottle, 10g of waste ALC panels (dry-milled to 0.35mm or less using a vertical roller mill) as a calcium silicate-based material, 5g to 100g of water (water ratio 0.5 to 10), and 5mmφ zirconia spheres as grinding media were added, and wet grinding was performed in a rolling mill at 85rpm (revolutions / minute) for 1 hour. The grinding operation was carried out at room temperature (20℃). The amount of water (water ratio) was specifically as shown in Table 1 below to prepare the first to seventh curing speed modifiers. These seven curing speed modifiers can be considered as a set of curing speed modifiers.

[0065] (Addition process) Compositions for cement hardening speed adjustment tests were prepared by actually adding the obtained hardening speed adjusters 1-1 to 1-7 to cement compositions and evaluating their hardening speeds. Specifically, 100g of ordinary Portland cement and 60ml of 20°C water were mixed in a 300ml poly cup, and then 5g each of hardening speed adjusters 1-1 to 1-7 was added and mixed thoroughly to obtain each test composition.

[0066] Furthermore, as comparative composition 1, a cement composition was obtained in the same manner as the above sample, except that 2g of silica and 1g of gypsum were added instead of 5g of hardening accelerator, and the amount of ordinary Portland cement was increased by 2g to 102g.

[0067] (Curing speed adjustment test 1) Test compositions and comparative compositions containing curing rate modifiers 1-1 to 1-7 were cured at 40°C for 2.0 hours to obtain test samples (80 mm in diameter x 20 mm in thickness). For each cured sample, the load was measured by pressing a push-pull gauge and a 15 mm diameter jig 5 mm perpendicularly to the center of the sample's surface and confirming the maximum load. The results are summarized in Table 1 below. Furthermore, Figure 1 shows a graph plotting the results of curing rate adjustment test 1, with water ratio on the horizontal axis and load (N) on the vertical axis.

[0068] [Table 1]

[0069] As can be seen from the results in Table 1 and the graph in Figure 1 above, it is possible to adjust the degree of curing after 2 hours of curing, or in other words, the curing speed, by controlling the water ratio when preparing the curing speed regulator. Furthermore, the test compositions to which curing speed regulators 1-1 to 1-7 were added all showed accelerated curing speeds compared to comparative composition 1 without curing speed regulators, indicating that they also function as curing accelerators.

[0070] [Curing speed adjustment test 2] (Preparation process for curing speed modifier) In a 300ml plastic bottle, 10g of waste ALC panels (dry-milled to 0.35mm or less using a vertical roller mill (coarse grinding operation)) as a calcium silicate-based material, 60g of water (water ratio 6), and 5mmφ zirconium spheres as grinding media were added. Wet grinding was performed at 85rpm (revolutions / minute) for 1 hour at room temperature (20℃) using a bench mill (500ml) to obtain a slurry. The obtained slurry (c) was used as the first curing rate modifier.

[0071] The obtained (c) slurry was filtered using a filter paper with a particle retention capacity of 11 μm as the filter medium, and suction filtration was performed using a Buchner funnel. The (a) filtrate obtained by the filtration operation was used as the second curing rate modifier. In addition, the filtrate remaining on the filter medium was air-dried in a fume hood ((b) filtrate) and used as the third curing rate modifier. These three types of curing rate modifiers can be considered as a set of curing rate modifiers.

[0072] (Preparation of a curing speed modifier for comparison) Using the same calcium silicate-based material used in the curing rate regulator preparation process, reinforcing bars were recovered from ALC panels. The base material was then dry-ground using a vertical roller mill until it passed through a 0.35 mm sieve to obtain comparative curing rate regulator C1. Furthermore, 10 g of the obtained curing rate regulator C1 was immersed in 60 g of water for 1 hour to obtain curing rate regulator C2.

[0073] (Addition process) Compositions for a cement hardening speed adjustment test were prepared by actually adding the obtained first to third hardening speed adjusters and comparative hardening speed adjusters C1 to C2 to a cement composition and evaluating their hardening speed. Specifically, 100g of ordinary Portland cement and 60ml of 20°C water were mixed in a 300ml poly cup, and then 5g each of the first to third hardening speed adjusters and comparative hardening speed adjusters C1 to C2 were added and mixed well to obtain each test composition.

[0074] (Curing speed adjustment test 2) Test compositions and comparative compositions containing the first to third curing rate modifiers and comparative curing rate modifiers C1 to C2 were cured at 40°C for 1.5 hours and 2.0 hours, respectively, to obtain test samples (80 mm in diameter x 20 mm in thickness). The load was measured for each cured sample in the same manner as in curing rate adjustment test 1. The results are summarized in Table 2 below. Furthermore, Figure 2 shows a bar graph of the results of curing rate adjustment test 2, with the added curing rate modifier on the horizontal axis and the load (N) on the vertical axis.

[0075] [Table 2]

[0076] As can be seen from the results in Table 2 and the bar graph in Figure 2 above, the test compositions to which (a) the second curing rate modifier (filtrate), (b) the third curing rate modifier (filter residue), and (c) the first curing rate modifier (slurry) were selected and added showed that the degree of curing, or in other words, the curing rate, was accelerated in that order after curing for 1.5 hours and 2 hours, indicating that the curing rate could be adjusted.

[0077] Furthermore, the test compositions to which the first to third curing rate modifiers were added all showed accelerated curing speeds compared to the comparative compositions to which curing rate modifier C1 (which is simply a dried pulverized material) and curing rate modifier C2 (which is curing rate modifier C1 immersed in water) were added, indicating that they also function as curing accelerators.

Claims

1. A curing rate modifier preparation step, which includes a wet grinding operation to obtain a slurry by wet grinding a calcium silicate-based material, An addition step of adding the hardening rate modifier to the cement composition, Includes, The aforementioned calcium silicate material is calcium silicate waste material. A method for adjusting the hardening speed of cement, comprising controlling the operating conditions and / or operating procedure in the hardening speed adjusting agent preparation step to adjust the hardening speed of the cement composition.

2. The method for adjusting the hardening speed of cement according to claim 1, wherein the operating conditions controlled in the hardening speed adjusting agent preparation step are the grinding conditions of the wet grinding operation.

3. A method for adjusting the hardening rate of cement according to claim 2, wherein the grinding conditions are controlled by selecting the water ratio (water / calcium silicate-based material) (by mass).

4. The method for adjusting the hardening rate of cement according to claim 1, wherein the hardening rate adjusting agent preparation step includes a filtration step of filtering the slurry following the wet grinding step.

5. The operation procedure controlled in the curing rate adjusting agent preparation step is the filtration procedure. A method for adjusting the hardening rate of cement according to claim 4, comprising selecting one from a group consisting of the filtrate obtained by the filtration operation, the slag, the slurry before the filtration operation, and a mixed liquid obtained by selecting two of these and mixing them, and controlling the operation procedure by further selecting the mixing ratio when the mixed liquid is selected.

6. The method for adjusting the hardening rate of cement according to claim 1, wherein the calcium silicate material is at least one waste material selected from the group consisting of ALC panels, calcium silicate boards, and siding boards.

7. A first curing rate modifier, which is a slurry obtained by wet grinding of a calcium silicate-based material, A second curing rate modifier, which is a filtrate obtained by a filtration operation to filter the slurry, The third curing rate modifier is the residue obtained by the above filtration operation, A cement hardening speed modifier set consisting of at least three types of hardening speed modifiers.

8. Furthermore, the cement hardening rate modifier set according to claim 7 comprises at least four types of hardening rate modifiers, including a fourth hardening rate modifier which is a mixed liquid obtained by selecting and mixing two from the group consisting of the slurry, the filtrate, and the filtrate residue.

9. It consists solely of a curing rate modifier, which is a slurry obtained by wet grinding of calcium silicate-based materials. The aforementioned calcium silicate material is calcium silicate waste material. n １ (n １ n (where n is an integer greater than or equal to 2) under various conditions １ The first-1 curing rate modifier to the first-n slurry are types of slurry. １ n of the curing speed modifier １ A cement hardening speed regulator set consisting of several types of hardening speed regulators.

10. The first curing rate adjuster includes n １ (n １ being an integer of 2 or more) types of slurries under n １ conditions, namely, the first-1 curing rate adjuster to the first-n １ curing rate adjusters, and consists of a total of (2 + n １ ) types of curing rate adjusters. The curing rate adjuster set for cement according to claim 7.

11. The curing rate modifier consists solely of a mixture obtained by selecting and mixing two from the group consisting of a slurry obtained by wet grinding of a calcium silicate-based material, a filtrate obtained by filtering the slurry, and the residue obtained by filtering the slurry. The aforementioned calcium silicate material is calcium silicate waste material. Two combinations of mixing selected from the group consisting of the slurry, the filtrate, and the filtrate, and / or n different mixing ratios thereof. ２ (n ２ n (where n is an integer greater than or equal to 2) under various conditions ２ The mixture of types is the 4-1 curing rate modifier to the 4-n ２ A cement hardening speed regulator set consisting of hardening speed regulators.

12. The fourth curing rate regulator is selected from the group consisting of the slurry, the filtrate, and the filtrate and mixed in two combinations, and / or n different mixing ratios thereof. ２ (n ２ n (where n is an integer greater than or equal to 2) under various conditions ２ The mixture of types is the 4-1 curing rate modifier to the 4-n ２ Includes curing speed modifier, total (3 + n ２ A cement hardening speed modifier set according to claim 8, comprising ) types of hardening speed modifiers.

13. The first curing rate modifier has a different water ratio (water / calcium silicate-based material) (by mass) during wet grinding. １ (n １ n (where n is an integer greater than or equal to 2) under various conditions １ The aforementioned slurry is a type of curing rate modifier, from type 1-1 to type 1-n. １ Contains a curing speed modifier, The fourth curing rate regulator is selected from the group consisting of the slurry, the filtrate, and the filtrate and mixed in two combinations, and / or n different mixing ratios thereof. ２ (n ２ n (where n is an integer greater than or equal to 2) under various conditions ２ The mixture of types is the 4-1 curing rate modifier to the 4-n ２ Includes curing speed modifier, total (2 + n １ +n ２ A cement hardening speed modifier set according to claim 8, comprising ) types of hardening speed modifiers.

Images